Decathlon Chield 12" User manual

Guide and guarantee
instructions
www.decathlon.com

IMPORTANT .............................................................................................4
ABICYCLE FOR EVERY OCCASION ..........................................................4
SAFETY PRECAUTIONS AND USER INSTRUCTIONS .....................................6
FIRST SECTION
ISetting the riding position and safety
1/ Ensure that the bicycle is the right size ...................................................8
2/ Adjusting the height of your saddle........................................................8
3/ Setting the stem and the handlebar ......................................................10
4/ Safety ................................................................................................10
5/ Suspension .........................................................................................12
6/ Maintenance of reflector......................................................................12
II Maintening your bicycle
1/ A bicycle should be maintained like a car ............................................13
2/ Maintening your bicycle will depend on the way you use it....................13
SECOND SECTION
III The necessary tools .............................................................................17
IV Assembly and adjustments
1/ Adjust the bolt and quick fastener machanism.......................................17
2/ Pedals................................................................................................19
3/ Brake levers and calipers.....................................................................19
4/ Gears changers ..................................................................................21
5/ Bearing adjustment .............................................................................23
6/ Chain tension for single speed bicycles.................................................24
7/ Tightening the seat..............................................................................25
8/ Fitting accessories ...............................................................................25
VBMX BIKES
1/ Changing and adjusting rear brake cables...........................................26
2/ U-type brake ......................................................................................26
GUARANTEE CHARTER ...........................................................................27
FREE REVISION .......................................................................................28
INDEX
Call centre No Reduce rate n° 08100808808
USER GUIDE AND GUARANTEE INSTRUCTIONS
THANK YOU FOR BUYING A DECATHLON BICYCLE !
You have just bought a Decathlon bicycl e. So that it gives you riding pleasure
for as long as possible, please read this use r guide . It will give you informa tion
necessary for adjusting, maintaining and properly using your Decathlon bicycle.
Keep this guide in a safe place.
Decathlon is not liable for accidents or injuries due to improper use of the product, failure
to adhere to the instructions given in this guide, or modifications to the product. While
every effort has been made to ensure that the information contained in the gu ide is
accurate and complete, Décathlon is not liable for any errors or omissions.
Maintaining your bicycle means it will keep its original qualities and its safety
features.
Along with our technicians, we guarantee you a bicycle that is pro perly
assembled and correctly adjusted.
Maintenance, adjusting and repairs
To reduce the risk of accidents and injury, look after your bicycle and have it
repaired in our after sales service departments.
Your Decathlon retailer
In addition to this guide, your Decathlon store is your main source o f information
and assistance. Your retailer is your first contact for maintaining, adjusting and
using your bicycle as well as its guarantee.
Guarantee
You also find in this guide all necessary information on your bicycle’s guarant ee.

Hybrid bicycles : are an ideal compromise between town bicycles and moun-
tain bikes. Comfortable, well-equipped, this bicycle will accompany your solo
rides, with the family or friends on small country roads or pathways. Its wheels
are thinner than those of a mountain bike and its diameter is larger, it is therefore
more comfortable on tarmac roads. Is the ideal bike for rambling!!
Town bicycles : Perfectly fitted, comfortable, it is ideal for
travelling in complete security in towns, in the middle of traf-
fic. Robust, it deals with paving stones and curbs. Impeccably clean with its mud-
guards and chain cover, you can wear town clothes without any problem. It is the
perfect town bicycle.
Road bicycles : They will accompany you throughout the
great outdoors and will be your perfect companion in grin-
ding out the miles. For fitness (to train alone or with friends) or for competition, it
is perfect for staying in shape and will be a good supplement to a mountain bike.
BMX : specifically designed for acrobatic disciplines
Several types of discipline: Street for figures in towns or in
skate parks ; Dirt for jumps with figures on earth mounds ; Flat for figures on the
ground ; Racing on an earth circuit with bumps
So properly identify your discipline.
Children's bicycles (16” to 24”) : Look, price, accessories...
according to requirements. To ride, tear long and have fun in
complete safety. Well fitted, comfortable, solid, practical and full
of clever tricks, it will be the ideal friend for going to school and outside school
activities.
5
IMPORTANT
Like all sports, cycling carries risks of injury and damage. Using y our bicycle, you
assume responsibility for this risk. Decathlon shall not b e responsible in case of
modification by the user. You should know and apply the rules of the cod e of the
road. You are responsible for properly maintaining and using your bicycle and
so reducing the risk of injury.
A BICYCLE FOR EVERY OCCASION.
A brief guide for choosing without getting it wrong!!
The Mountain Bike : has imposed itself today as the
ideal article for getting off the road and wandering around
the countryside and in forests and mounta ins. With its large tyres, it is stable and
gets through mud, gravel or sand pathways without difficulty.
All suspension mountain bike, with its telescopic fork and suspension, this
is the ultimate sporting bike.
4
Rear brake
Rear dérailleur Chain Crankset Pedal Wheel Rim Tire
Seat
Seat post
Crank
Front brake
Front fork

To ride responsibly on pathways, here are some rules:
- leave no traces
- control a bicycle
- always let others pass
- do not frighten animals
- look in front of you
- leave with your waste in your pockets
Warning : WHEN YOU ARE RIDING WITH CHILDREN :
- Decathlon recommends and wearing helmets and strongly ad vises fit ting a baby
carrier and all frame accessoriesshould be carried out by qualified and expe-
rienced mechanics. If you insiston fitting a baby carry by yourself, we recom-
mend that you check with our sales staff that the luggage carriers and baby
carriers are compatible with safety regulations.
- Be careful when you are riding with a baby carrier, it adds weight to the rear
and raises the bike’s centre of gravity, making balance and bends more difficult.
- Children must always wear helmets when they are transported on a baby carri er
or in a trailer. Please note that helmets are legally compulsory in many countries.
- Wheels attract the attention of children and present a serious danger for young
fingers!! If a child puts his fingers in the spokesor between the chain a nd cha in
wheel... this will lead to pinching and /or injury.
Warning : All frames and components should be regularly
checked by our after sales department for signs of wear and/or essential brea-
kage (cracks, corrosion, breaks...) These are important safety verifications to
avoid accidents, body injuries and that your bike continues to last and give you
pleasure.
Warning : Downhill riding on mountain bikes should be made
safe by reinforced clothing and ensure that your bike is in perfect condition. To
minimise the risk of accident, wear helmets and check your bike and... be careful.
7
SAFETY PRECAUTIONS AND USER INSTRUCTIONS
Precious advice for riding in complete safety
Always carry out a complete check before riding.
Thoroughly read the safety section I 4/
Always wear helmets when you are riding to protect your head
in a fall.
Ride in the same direction as traffic, never against the flo w
Never attach yourself to a car or any other vehicle
Check your speed, avoid big differences
Riding two on a bike and carrying baggage obstructs your visibility or limits your
control, this can lead to falls or losing control.
If you are riding at night or in bad weather :
Wear reflective and clear clothing and fit your bicycle with front and rear lighting.
Lighting and red reflectors at the rear and lights and yellow or white reflectors at
the front as well as side reflectors on the wheels.
Ensure your bike is fitted with reflectors. If you are surprised by rain, remember
that breaking distances increase during rain and visibility and adherence are
reduced.
Lighting is compulsory for riding at dusk, at night or at dawn
refers to your state mandatory.
NB: allour bicycles are fitted on leaving the store with front and rear l ighting as
well as back and side reflectors.
Access to pathways, responsible riding and code of good riding.
Do not consider access to pathways guaranteed. Your behaviour on your next ride
will influence accessibility to pathways in the years to come. Limit skidding, avoi d
muddy areas and remain courteous with walkers and horse riders.
6
The B’twin Bicycle is not a toy. This p roduct is not suitable for use by children
under the age of 6. Use by a child aged 6 to 12 years must b e under the full
and direct supervision of a responsible adult. An adult should review and
explain the full set of instructions in this guide with the youth (age 6 years and
over) before going riding.

For your safety, the saddle
should not be raised above
the marker on the seat post.
• Mountain bike/Hybrid/town bike
For a good pedalling position, set your saddle height so
that with your leg extended your heel rests on the pedal (in
the lowest position)
Therefore, when pedalling your leg will be slightly bent at
the lowest point so that your hips do not sway and for easy
pedalling.
Rapid seat pin blocking will make tightening easier
To tighten, place the lever at 90°, completely hand tighten
the screw and pull the lever down. The force used should be
sufficient to block the seat pin.
• Road
Multiply the crotch value by 0.88 to obtain
your seat height, the distance separating
the centre of your pedal above your seat,
that you will set parallel to
the ground.
DECATHLON ADVICE :
• Using a mountain bike, your saddle will be set in a high position when you are
on flat or rising ground to increase your pedalling power. However, going
downhill, to better control your bike, lower at the saddle so you can recover
your route by putting your feet on the ground.
• To set the saddle recoil: sat on the saddle, feet in the pedals (conventional or
automatic), the swivel joint should be perpendicular to the pedal spindle when
the crank is horizontal.
A
A x 0,88
9

FIRST SECTION
ISetting the riding position and safety"
1. Ensure that the bicycle is the right size
A bicycle that is too big or two small for riding is difficult to control and may be
uncomfortable.
Size of the frame (one inch = 25,4mm):
To check if the size of the bicycle is correct, just get on it and put your hands o n
the handlebars. If your crotch touches the frame, the bicycle is too big for you.
There should be between one and two inches between your crotch and the frame.
Your size Mountain bike Hybrid/town bike Btwin
frame frame frame
From 1m05 to 1m20 16” (4 to 7 years old)
From 1m15 to 1m40 20” (7 to 11 years) 20” Btwin
From 1m35 to 1m55 24” (from 8 years old) City bike 24” 24” Btwin
From 1m55 to 1m60 S S S (24’’)
From 1m60 to 1m70 M M M
From 1m70 to 1m80 L L L
More than 1m80 XL XL XL
SPORT COMPETITION
Your crotch Road frame Your crotch Road frame
630 to 676 45 715 to 746 49
2/ Adjusting the height of your saddle
You should check the height of the saddle and handlebars, check the condition of
wear parts and maintain them to ensure complete safety.
8

Inflate your tyres to the right pressure (fig.1)! You must follow the pressure range
shown on the side of the tyre by the manufacturer, your tyres and their resistance
to puncture depend on it. Mount the tyre in the direction shown on the side (the
arrow showing rotation direction fig 2)
Note that 14.5 PSI= 1 BAR and 1 BAR=1 Kg/cm2= 100000 Pa
Is your fixing system properly tightened?
Carefully read the section concerning proper procedures to follow with quick
release fasteners IV 1/.
Do your front and rear breaks work properly?
Properly read the section concerning the proper procedures to follow the setting
leavers and brake callipers.
Break pads should be in firm contact with the rim without the brake lever blocking
against the brake handle.
With hydraulic brakes, check the lever is firm, that it is not too close to the handle,
and that there is no trace of leakage of brake liquid. With disc brakes activated
by cable, check the firmness of the lever and that it is not to close to the handle.
With all disc brakes, the plates should be in firm contact without the lever being in
contact with the handle.
Be careful of the heat given half by disc brakes after braking.
Can you change speeds easily?
Check that your speeds are flexible and that you can change them easily.
Thoroughly read the section on changing speeds and adjustments...
Do you wear a helmet, reinforced clothing and equipment like glo-
ves and glasses?
Never wear clothes that are too big and could get stuck in the wheels...
3
5
-
6
0
P
S
I
(
2
,
5
-
5
,
5
B
A
R
)
!
R
O
T
A
T
I
N
G
D
I
R
E
C
T
I
O
N
!
Fig.1
Fig.2
5
7
-
5
8
9
(
2
6
x
2
,
1
2
5
)
11
3/ Setting the stem and the handlebar
For your safety, the handlebar may be extended until the maximum markers
(diagram 1)
• Road
Once the height of the saddle has
been defined, establish the difference
of 2 to 5 cm less, between the height
of the saddle and the height of the stem in a position that suits you, in any case
never exceed the dimension set by the manufacturer on the stem.
• Town/hybrid
Set the height of your handlebars to give you an upright and comfortable
position.
• MTB
Diver stems may be extended to the maximum markers (the stem may be extended
to the maximum markers (diagram 1). A Headset type stems cannot be set, except
adding a rain to raise it a little.
4/Safety
Are your saddle pin and stem properly tightened?
Firmly turn from one side to the other blocking the front wheel between your legs.
The stem should not move on the steering pivot. The saddle pin should also be
properly tightened in the saddle tube.
SAFETY: be careful not to exceed the manufacturers mark except uncertain moun-
tain bikes with an lowered upper tube wear the length of saddle pin should be
kept inside the frame.
Are your tyres properly inflated, are they the correct dimension,
are they mounted in the right way?
2 à 5 cm

10
Maxi

II Maintaining your bicycle
1/A bicycle should be maintained like a car.
Your bicycle needs a minimum of maintenance and regular revisions are necessa-
ry. Their frequency will depend on the type of bicycle (town, road, mountain bike)
and types of use.
CLEANING : Your bicycle may be cleaned simply with a water jet, soapy water
and a sponge. The transmission parts may be cleaned with a small brush.
Be careful with using high pressure cleaners! Do not use a vapour jet: grease may
liquefy inside mechanical parts, your bicycle will be permanently immobilised,
bearings and transmission completely seized up.
Avoid too powerful jets, they could damage the frame’s enamel. Avoid pointing
the jet at the mechanical parts. Wipe and dry your bicycle carefully.
OUR DECATHLON SELECTION: Greasing kit and oil, maintenance kit (brush,
degreaser, lubricant, grease)….
LUBRICATION :
Use a Vaseline type oil for cables and transmission parts. It is preferable to use
specific oil for the chain.
Immediately after cleaning, oil transmissions, links and gear change wheels, shift
levers, brake levers, brake calliper spindles and the chain.
Thing to check and replace your chain (see terminals)
Sufficiently grease the saddle pin and plunge the stem for proper watertightness.
Certain hubs have a greasing hole: inject grease with a syringe
The play in the cartridge type chain-sets needs no maintenance: sufficiently water-
tight, they are greased for the entire lifespan of the product.
OUR DECATHLON SELECTION: Teflon oil, grease pot...
Warning : All these operations should be renewed frequently in case of
use in a salty environment and before long-term storage.
2/Maintaining your bicycle will depend on the way you use it.
- Town and riding bicycles require periodic maintenance:
regularly grease the chain, brush the cogs and plates, regularly put a few drops
of oil on the cable housing (brakes, gear changers), remove the dust from the
brake rubbers
- Mountain bikes should be washed after intensive use on muddy and dusty
ground: frame, wheels, chain, plates and cogs.
13
Is it raining or wet?
In this case, be even more careful. The risks in braking increase and the adheren-
ce of your tyres on the road is reduced. Also remember that the visibility of motor
vehicles is reduced in bad weather.
Are your pedals properly tightened?
Check your pedal is properly tightened to the crank.. Read the section on how to
fix your pedals IV 2/ ...
How do clipless pedals function?
Engage and disengage your shoes in the pedals before leaving. Experienced
cyclistsdo this. The interface between the toe clip and the pedal may be affected
by different factors like dust, mud, lubrication, spring tension and wear. By enga-
ging and disengaging, you check operation and you familiarise yourself with the
feelingof the pedals.
CAUTION : Check the distance between the toe end a nd front wheel,
this could lead to a loss of control of the bike.
5/Suspension
See the instructions that you can check on website.
Even greater care should be taken with bicycles fitted with a telescopic fork; parti-
cularly telescopic forks assembled with fixing screws.
Each time, you should check that there is no play between the screws and
the assembled parts. If this was the case, see exclusively a professional or your store to
have them tightened as they will have to be covered with thread lock before tightening.
Warning : Disconnection from the fork may cause the cyclist to fall.
6/Maintenance of reflector
Your reflectors are an important part of your bicycles safety equipment. Do not
remove the reflectors from your bicycle; they are there for your safety.
Every three months, make sure all the nuts and bolts holding the front, rear, pedal,
and wheel reflectors are tightened. Check that the front and the rear reflector are
oriented so that their reflective surfaces are perpendicular to the ground and that
all reflective surfaces are clean and in good condition. The front reflector should
point directly forward, and the rear should point directly backward. The rear
reflector should be at least three inches below the top of the seat.
To adjust the front and rear reflectors, bend the metal bracket, or loosen the
attachment screw on plastic brackets, reposition, and then re-tighten the screw.
12

MAINTENANCE
(For information purposes)
Mountain bike
Road
1 year
• Change of chainset box
• Changing cables & brake
housing & gear changers
Town
BMX
2 years
• Change of chainset box
• Changing chain
• Changing cables & brake
housing & gear changers
Mountain bike
Road
6
months
• Changing chain
• Complete tightening
• Tension and/or wheel truing
Child
3
months
• Complete tightening
• Tension and/or wheel truing
Town
BMX
14
Think of your
free revision
Type of bike Stem /
HandlebarStem / Fork Seat/Seat post Seat post/Frame Front wheel/
Frame
Rear wheel/
Frame
Child (12’’) 14 20 Not applicable 10/12 14 8 Child (14’’ & 16’’) Not applicable 20 Not applicable 10/1222/3022/30
Junior (20’’ & 24’’) 1 screw 18 2
screws 12
1 screw 21 2
screws 1222 Quick release or
12/14
Quick release or
22/30
Quick release or
22/30
BMX 10 10 16 orpivotal
system 6
Quick release or
8/1035/4035/40
Town and country*
1 screw 18 2
screws 14 4
screws 7
1 screw 18 2
screws 12 18 Quick-release Quick-releaseQuick release or
22/30
City (Elops)
100 17
20 21 7 25 32
300
14
500 700
Recreational mountain
bike 10 7 17 RR 5.1: 24Quick-release or
8/10Quick-releaseQuick release or
22/30
Sports mountain bike 6 7 17/24Quick-release or
8/10Quick-release Quick-release

SECOND SECTION
III The necessary tools
To assemble, adjust and repair your bicycle correctly, you should have certain
basic tools:
These tools are essential to carry out basic assembly. They will be useful for you
to carry out adjustments set out in this manual.
DECATHLON ADVICE :
Never forget to take a minimum amount of material when riding
- a chain rivet tool and a chain quick release
- a pump
- a multiple function tool
- tyre lever
IV Assembly and adjustments
1/ Adjust the bolt and quick fastener mechanism
The wheel axe is held in place by the force of the quick fastener pushing against a
counter shaft and pulling the tension adjustment bolt, with a skewer, against the
other counter shaft. The force is controlled by a tension adjustment bolt. Turning
the tension adjustment bolt clockwise increases the force for blocking; turning it
anticlockwise reduces it.
regulation
of force
open closed closed open
open positionopen position
closed positionclosed position
17
Medium size
standard
screwdriver
Phillips
screwdriver
10” adjustable
wrench
6” adjustable
wrench
Pliers Metric
allen wrenchs
Type of bike Stem /
Handlebar Stem / Fork Seat/Seat post Seat post/Frame Front wheel/
Frame
Rear wheel/
Frame
Competition mountain bike 5 7 8
Quick release or
8/10 5/7 carbon
frame
Quick-release Quick-release
Road Sport/Training 6 6 1 15mm screw 2
9mm screws
6/8 aluminium
frame Quick-release Quick-release
Road Competition 5/6 6/7 1 15mm screw 2
9mm screws 5/7 carbon frame Quick-release Quick-release
Folding bike: Tilt 9 12 24 Quick release and 7 34 34 B'Original
Easy park 1
screw 20 Other 1
screw 12
Easy park 2
screw 9 Other 1
screw 15
22 Quick-release Quick-release 25/35
Urban sport (nework) 6 6 17 Quick release or
8/10
12/16 orquick
release
22/30 orquick
release
Torque of stem angle adjusting bolt= 18 Nm. if the tightening torque is indicated on the component, use this as a reference point

2/ Pedals
Warning :
Avoid hand tightening the pedal, use the proper wrench (15 metric size )
I/ Identify your pedal, look at the letter on your pedal L or R
2/ The pedal marked R is to the right of your bicycle. Turn it to fix the crank clockwise
3/ The pedal marked L is to the left of your bicycle. Turn it to fix the crank anticlockwise
3/ Brake levers and calipers
The brake lever should only be moved a minimum for proper adjustment, the lever
should not touch the upright handlebar during maximum braking
Brakes are very important!!
With V-Brakes, a bent tube for quick fastener should be correctly mounted. With
cantilever brakes, the drop wire for quick fastener should be correctly mounted.
With brake callipers, the quick fastener lever should be closed.
CAUTION : Road: see Shimano or Campagnolo instructions
There are two types of the braking systems on mountain bikes/town
bikes/hybrids: cantiver and the V-Brake system and calipers for road bikes
Adjusting brake pads
1/ Check the alignment of the pad with the rim side.
2/ Check the pads are properly centred relative to the wheel
Be careful to leave 1 mm between the rim and the pad.
L R
Left and right
L
R
19
Removing or installing the wheel fixing system
- opened the brake pad (see the Brakes section)
- turned in the quick fastener lever from Closed to Open.
- correctly position your fork on the fastener
- turn the quick fastener from Open to Closed.
The force should be sufficient to block your wheel.
Warning :
Before use, lift the wheel from the ground and hit the wheel firmly downwards
(front wheel and then back wheel). The wheel should not come away all be
untightened. In case of uncertainty, tighten again.
You should feel strong resistance lowering the quick fastener lever: the wheel is
then properly assembled.
Warning :
It is extremely dangerous to remove or damage the fastener bolt and an addition
of these two would lead to damage and falls. It may also cancel the guarantee.
OPENOPENCLOSECLOSE
OPENOPEN
CLOSECLOSE
SAFETY RING
NUT
HUB
18

For disc brakes (see the manufacturer’s manual)
1/ Assembling the brake cable
Loosen in the cable clip on the brake caliper
Remove the old cable from its housing
Slide the new cable into the housing, pass it through the hole in the brake caliper
housing block then put the cable into the cable clip.
Press the brake cam half down and close the cable clip.
Cut the excess cable
Adjust the setting using the brake lever setting key
2/Changing the friction pads
Loosen the brake cable
Remove the supporting screws from the caliper on the fork
Remove the screws that fix the friction pads or lift and pull the plate directly
depending on the model.
Remove the pads and replace them in the same way
Loosen the cam check nut, adjust the stroke using an Allen wrench then tighten the
nut.
Warning :
To maintain efficient breaking and limit wear in the rims, replace the p ads as soo n
as wear becomes too noticeable. A worn pad is one where the fluting or the not-
ches can no longer be seen...
The sides that run against the pads should also be watched As soo n as si gns of
the side opening or loss of parallelism, change your rim.
Disc brakes become hot and may cause burning, after breaking weight about 30
minutes before touching the rotor.
4/ Derailleur
You will find two types of the changer on Decathlon bicy cles
- a conventional gear changer (most bicycles)
- speeds in the hub
21
3/ Always move the back of the pad away from the rim
Be careful to leave about 1 mm between the rim and
the pad.
Changing brake pads
Unscrew your pad with an Allen wrench until
he can be removed and carry out the reverse
operation when you change it.
Adjusting the brakes
The operation/ how to use the brake
When you brake, use only the back brake first and then use slightly and gradually
the front brake. An over load on the front brake lever may result in falling down
forward. Be sure you know how to use your brakes before riding the bike.
I/ Unscrew the pad fixings (see the essential tools section)
2/ Put the pads on the rim and adjust as described Be careful to tighten in the
pad fixing
3/ Adjust the balancing (positioning) of the callipers if necessary
Pads will be handled differently depending on the type of brake:
35 mm or more
Less tension
screwdriver
More tension
screwdriver
Tension spring
+ adjustment screw
Aluminium tube
Side pull
CABLE
NUT
PULL THE CABLE
ADJUSTMENT
CABLE
TRIANGLE NU
TRIANGLE
SAFETY HOOK
POSITION
CANTIVELER
PULL THE CABLE
RIM
20

CAUTION :
When you intend on changing spe ed, continue p edalling normall y without
forcing, push the gear changer switch until the chain is in place on the chosen
crown or spindle, if your gear changers are not indexed.
Each clog on the switch corresponds to aposition on the spindl es. If the chain
tends not to go up or down quickly on the spindle, stretch the cabl e turning the
adjustment cylinder located on the switch all the gear changer, anticlockwise.
If the chain tends not to go up or down too quickly, turn at the cylinder clockwise.
The spindle must be changed fluidly
5/Bearing adjustment
The fork is responsible for holding the front wheel of your bicycle. The headset is
the bearing system, which allows the steering of your bike by the rotation of the
fork, the stem and the handlebar.
There are several areas on your bicycle containing bearings that must be adjusted
and/or lubricated. Proper maintenance in these areas will insure longer bearing
life, and easier and safer riding of your bicycle.
Proper adjustment of these bearings requires special tools and knowledge. We
suggest these adjustments be made by a qualified repairman. Please see instruc-
tions below for checking if bearings need to be adjusted. If so, follow these
instructions:
1. Put the key washer onto the fork stem so it is down as far as possible. The small
tab inside the key washer must fit into the slot on the fork stem.
2. Thread the lock nut onto the fork stem by hand.
3. If there is front to rear play in the headset tighten the adjusting cone, then secu-
rely tighten the lock nut
4. To check the headset for proper tightness, bounce the front wheel on the
ground and turn the wheel from side to side. If the fork binds, it means that it’s
(too tight). If the fork shifts, it’s (too loose). Loosen the lock nut, readjust the
adjusting cone, and then re-tighten the lock nut.
DANGER :
An over tightening of the stem-to-fork assembly bolts can make irreversible dama-
ges in the steering tube and may provoke an accident that can cause serious inju-
ries or death (can pull a blocking or a breakage of the movements, damage the
tube of direction…)
To avoid an over tightening, please respect the torques given in the “Assembly
and adjustments” chapter.
23
CONVENTIONAL GEAR CHANGER
The gear changer stroke (front and rear) should not be too large so as not to
derail the chain. "Both gear changers should be adjusted as explained below:
REAR GEAR CHANGER:
Turn the screws stop as shown in the diagrams to align
the rear gear changer roller below the large spindle
(when the turning wheel is at the slow speed) and
below the small spindle (when the turning wheel is at
the greatest speed).
The screw marked H prevents the chain from going
beyond the large spindle and the screw L prevents it
from going beyond the small spindle.
FRONT GEAR CHANGER:
Turn the screws stop as shown in the diagrams having
previously position the chain as shown. The space bet-
ween the chain and the guide should be between 0
and 0.5 mm.
The screw marked L prevents the chain from derailing
in the frame, the screw marked H prevents derailing in
the right-hand pedal.
SPEEDS IN THE HUB
Setting speeds in the hub is very simple. The
method is explained in detail in the manufacturer's
instructions. This system enables you change speeds
when stopped, without noise and instantly and you
cannot derail. Single speed bicycles or those fitted
with hubs do not have gear changers and need no
specific maintenance. The chain tension should
however be verified (it slackens over time). Too
strong tension in the chain could damage the effec-
tiveness of the bicycle amateurs in its lifespan
(pedalling hard). Too week tension may lead to fre-
quent derailments.
22
L
H
L
H

7/Tightening the seat
Removing or installing the wheel fixing system
- loosen the quick fastener or nut (as for the wheel quick fastener)
- turn the quick fastener lever from Closed to Open.
- correctly position your seat in the tube
- turn the quick fastener lever from Open to Closed
Never go beyond the insertion limit.
Warning :
The force should be sufficient to block your seat in
Carefully read section I 1/
8/Fitting accessories: reflectors, bottle cage, stand, stabilisers
Advice: Our workshop is available to carry out any assembly in complete safety
You will find inserts on your frame to fit a bottle cage
For the stand, follow the diagram below
Refer to the assembly instructions for stabilisers.
25
CAUTION:
Headset adjustment requires special tools and training, and should only be perfor-
med by your bike dealer. Further adjustment of the rotor is covered in the brake
system section.
6/Chain tension for single speed bicycles
The chain transmits the energy that you supply when you pedal to the wheel. As
with cars, a "gearbox" is there to adapt the speed of the engine (your legs) to that
of the wheels.
A correctly stretched chain moves up or down about 1 cm.
Tension is adjusted by advancing for bringing back on the back wheel.
Frequently check tension and the condition of the chain: it should always be lubri-
cated and clean.
Warning :
A chain should never cross,
it will wear prematurely and may break
1 cm
24

GUARANTEE CHARTER
The guarantee covers: all material or manufacturing fault observed by Decathlon
workshops, the replacement of defective parts by similar ones as well as labour.
Guarantee period:
•Five years for the frame
•Two years for other components, paint and labour
Coverage of the guarantee
•Absence of shocks, the product should not be damaged in normal conditions
of use
•The product should be used in compliance with instructions and regularly main-
tained by our workshops
•Original parts were not replaced by non-approved parts
Exclusion from the guarantee
•Damage the responsibility of a third party or the result of an intentional fault
•Damage resulting from maintenance or use not compliant with the manufacture-
r’s instructions or negligence
•Wear parts (bulbs, cables and housing, toe clips, plates, chain, rim, spindles...)
and their replacement
•Any product that has been modified outside our workshops
•Original parts replaced by non-approved parts
•Damage the result of fire, lightning, storm, vandalism or non-secure transport
27
VBMX BIKES
Rotor
1/Changing and adjusting rear brake cables:
Assemble the lower cable (coming from the rotor to the rear brake jaws) and pre-
set the rear jaw fixing the cable tension with the jaw cable clip.
Assemble the upper cable (from the rotor to the rear cable lever)
Set the two fixed lower cables on the rotor’s mobile flange using setting screws
screwed to the fixed flange. These two cables should be synchronised and the
flange should move in parallel to the fixed flange
To the same for the upper cables.
The mobile flange stroke should be maximum to enable the brake lever to provide
the system with maximum efficiency
2/U-type brake
Loosen triangle nut, bring this triangle to about 1cm above the safety hook then
tighten the jaw cable clip. Pull the cable, the two pads will then touch of rim.
Tighten the cable clip.
Squeeze the brake handle to check, and adjust the two arms between them tur-
ning the central setting nut.
Assembly of pegs
Steering nut
Steering cone
Steering
Upper fixed flange
Fixed lower flange
Mobile flange
TO BRAKE
LEVER
upper cables
upper flange
upper adjustment
screw
lower flange
stroke
mobile flange
Lower adjustment screw
PARALLEL
26

29
3 years
NAME
DATE
4 years
NAME
DATE
5 years
NAME
DATE
6 years
NAME
DATE
7 years
NAME
DATE
FREE REVISION
When you buy a Decathlon bicycle, a safety visit is provided free
of charge within the three months following your purchase
Contact out after sales service department and make an
appointment, we will check all safety points.
28
3 months
NAME
DATE
6 months
NAME
DATE
1 year
NAME
DATE
2 years
NAME
DATE
FREE REVISION

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3130
DECATHLON CYCLE
BICYCLE ASSEMBLY CHECKLIST
All pivot points lubricated
Pedal threads, seat & stem freewheel theards greased
Hubs adjusted, locknuts tight
Wheels trued
Wheels centered & tight
Headset adjusted & locknut tight
Handlebar and stem bolt tight brake levers positioned and tight
Cantilever/Caliper mounting
Brake pads positioned and tight
Brake cable adjusted
Bottom bracket adjusted
Crank arm bolt tight
Derailleur mounting bolt
Front & rear derailleur aligned & adjusted
Air in tires to proper pressure
Tires inspected for mounting on rim
Reflector kit installed
Kickstand straight & tight
Accessories installed & tight
Cable end caps on
Valve dust caps on
Test ride
NAME :
DATE :
SERIAL NUMBER :
MODEL :

B'twin designs and develops ranges of products to satisfy every requirement. B'twinproducts
are created by a multidisciplinaryteam of engineers, competitorsand designers who are
driven by a passion for bicyclesand their technicalnature.
As a leading European manufacturer, we innovate in partnership with the Sportlab so
that you may fully live your passion.
Our design department ensures that our products meet your expectations
of the image of the b’Twin. They bring specialcare to make sure that
the technical nature; the comfort and the look of our bicyclesare perfectly
adapted to their use. Modernity, simplicityand passion guide our imagination.
Designer
Industrial design
Design
Innovation
Manufacturer of bicycles
Réf.pack : 2138231
DECATHLON USA -
2300 16th St, San Francisco, CA, 94103