by.schulz D.2 ST-Ri User manual

D.D.22
INSTALLATION + OPERATING INSTRUCTIONS
D.2 ST-Ri
www.byschulz.com
D.D.22
EN

2/20 Installation + Operating Instructions D.2 ST-Ri Seatpost
INTRODUCTION
Thank you for choosing a by,schulz product. Please read
these instructions carefully before assembly and use, and
keep them in a safe place. If you have any further ques-
tions about this product, please contact your dealer.
We wish you a safe ride!
TABLE OF CONTENTS Page
1. Usage approval 02
2. Safety instructions 02
3. Scope of delivery 03
4. Function 03
5. Technical Data 04-05
6. Spring elements 05
7. Seatpost components / Exploded view 06-07
8. Installation requirements 08-09
9. Installation 10-14
9.1 / 9.2 Tools + preparation 10
9.3 Mounting the remote lever 10-11
9.4 Routing the cable 12
9.5 Connecting seatpost + remote lever 12-14
9.6 / 9.7 Saddle installation / adjustments 15
10. Changing the spring element 16-17
11. Operating the seatpost 18
12. Care / Cleaning 18
13. Warranty / Guarantee 19
14. Maintenance / Service card 19
1. USAGE APPROVAL
The adjustable parallelogram suspension by,schulz D.2 ST-
Ri seatpost is for use with bicycles, cargo bikes, pedelecs
and e-bikes up to 45 km / h suitable. It is NOT designed
for extreme loads that occur during downhill, dual slalom
or freeriding, or for riding proles with jumps. The D.2 ST-
Ri seatpost is made of high-strength aluminium, and has
been tested and approved according to the following DIN
standards:
Before the rst ride:
We strongly recommend that you check the roadworthiness
of the bicycle in general, and the operational safety of the
seatpost in particular, before each ride.
First check that the saddle is rmly secured in the saddle
clamp. Also make sure that the seatpost tube is free of
play and rmly connected to the bicycle frame. It must be
clamped in the desired position in such a way that it cannot
be turned or moved in the seat tube. Please note the mini-
mum insertion depth of the seatpost of 100mm.
2. SAFETY INSTRUCTIONS
1. These instructions contain important informa-
tion on the proper assembly, use and maintenance of
the by,schulz D.2 ST-Ri seatpost.Take the listed warning
and safety instructions seriously. Failure to do so may
result in property damage or personal injury, for which
neither the seller nor the manufacturer is liable.
2. Check the installation requirements before assembly.
If you do not have the necessary skills and / or tools, we
strongly recommend having the installation carried out
by a specialist dealer
3. Child seats, trailer couplings or luggage carriers must
not be attached to a D.2 ST-Ri seatpost as this can lead
to breakage or damage.
4. To avoid further risks of accidents after a fall with
damage, the seatpost must be checked and replaced
if necessary.
5. Always use the protective neoprene cover to cover
the spring mechanism if a child seat is mounted behind
the seatpost. Without the cover, there is a risk of injury
to children's hands!
6. The D.2 ST-Ri seatpost is not to be used for trans-
port with car bike racks where the bike is attached to the
saddle. Fastening to the seatpost may only be done as
shown in Fig. 2.1!
7. Clamping systems of mounting stands may only be
attached to the outer seatpost tube below the screw ring,
or to the frame of the bicycle. The inner seatpost tube
and the area of the screw ring are not suitable for this
purpose (Fig. 2.1).
Incorrect attachment can cause damage to the seat-
post, and void the warranty!
Fig. 2.1

3/20
Installation + Operating Instructions D.2 ST-Ri Seatpost
3. SCOPE OF DELIVERY
· D.2 ST-Ri seatpost incl. neoprene protective cover
· D.2 ST-Ri remote lever
· Inner cable with cable housing, end caps,
cable ttings and cable end sleeve
· Instruction manual
· Service card
4. FUNCTION
The D.2 ST-Ri combines the advantages of the by,schulz
D.1 dropper seatpost, with the maximum ride comfort of the
renowned G.2 parallelogram suspension seatpost with a
suspension of about 30mm in the ST variant (short travel).
Inside the drop down D.2 seatpost, a high-quality gas
pressure spring is installed. This allows to vary the saddle
height via a remote lever mounted on the handlebar! When
actuating the remote lever, the valve on the gas spring is
opened via an internal cable. As a result, the saddle is
lowered under load of the body weight, or raised when
relieved. When the lever is released, the valve closes and
the saddle remains at the current height.
By means of a remote lever mounted on the handlebars
the D.2 ST-Ri allows a comfortable lowering and raising
of the saddle position while riding or standing. This allows
you to individually adjust a perfect riding position. The low-
ering or raising of the saddle is triggered by operating the
remote lever. The saddle lowers down.
To lower the saddle height while riding, or when stopping
e.g. at a traffic light, keep your weight on the saddle and
operate the remote lever mounted on the handlebar.
To activate the seatpost extension, unload the saddle by
lifting your body and press the remote lever. The seatpost
now extends to the maximum height or stops and remains
in the current position when you release the lever.
The speed of this function can be controlled by the inten-
sity of the pressure on the remote lever. Little pressure
causes slow extension, strong pressure causes extension
at maximum speed.
The progressively designed parallelogram suspension
of the D.2 ST-Ri reacts sensitively to slight bumps, and
with increasing spring resistance to hard impacts. It dives
under load up to 18 mm to the rear, and about 22 mm
downward. For optimal adaptation to the rider's weight and
riding style, easily interchangeable spring elements with 4
different degrees of hardness and damping are available.
TIGHTENING TORQUE: This symbol re-
fers to an important screw connection that must be
tightened with an exact tightening torque. The cor-
rect tightening torque is either listed on the compo-
nent itself or in these operating instructions. A torque
wrench is required for execution! Screw connections
that are not tightened correctly can loosen or break
without warning.This can cause a fall or lead to prop-
erty damage and personal injury!

4/20 Installation + Operating Instructions D.2 ST-Ri Seatpost
5.1 TECHNICAL DATA
· Materials : Aluminium AL-6061, AL-6066, black anodized
· Cable routing : internal (Ri = remote inside)
· Suspension element : Length approx. 72mm
· Suspension travel : approx. 30mm
· Installation height retracted (dim. C) : approx. 135 mm
· Installation height extended (dim. H) : approx. 215 mm
· Offset : approx. 17 mm
· Rider weight : Ø 30,9 / Ø 31,6 : max. 115 kg
Ø 33,9 / Ø 34,9 : max. 130 kg
· Adjustment range / Travel (dim. G) : T80 = approx. 80 mm
· Bearing / linear guide : IGUS polymer high performance
plain bearing/ linear guide
· Diameter : Ø 30,9 | 31,6 | 33,9 | 34,9 mm
· Weight : approx. 965 g (Ø 30,9; T80 incl. medium spring)
· Suspension elements in 4 degrees of hardness for
adaptation to the rider's weight, easily exchangeable
· Saddle clamp Ø 7 mm with ne adjustment and robust
detent, optionally available for Ø 8 mm saddle rails
Remote lever D.1/D.2 Ri:
· Materials : Aluminium AL-6061, black anodized;
stainless steel, clamp band, black, screws; synthetic
components
· Clamping diameter : approx. 22,2 mm
· Lever radius : approx. 11 mm (Fig. 5.1)
· Weight : approx. 55 g
The D.2 ST-Ri seatpost is shipped with a remote lever
matching the seatpost model.You can recognize the
correct version by the imprint on the underside or lever
radius. (Fig. 5.1)
Cable routing:
· Cable housing: Jagwire approx. Ø 4,2 mm outside,
L = approx.1700 mm
· Shift cable / inner cable: Jagwire approx. Ø 1,2 mm,
L = approx. 1800 mm
Gas pressure spring:
Maintenance-free by,schulz gas spring
· Ø 30,9 / Ø 31,6 | T80: Housing Ø16,5; piston rod Ø6; M6
· Ø 33,9 / Ø 34,9 | T80: Housing Ø18; piston rod Ø6; M6
Dim. Dapprox. 225 mm
Dim. Capprox. 135 mm
Dim Bapprox. 190 mm
Dim. Aapprox. 280 mm
5.2 TECHNICAL DIMENSIONS
A - Max. installation depth incl. cable guide
B - Min. installation depth incl. cable guide
C - Min. retracted body height
D - Max. retracted body height
E - Installation space for Ri cable routing
Fig. 5.1
3 Nm D.1/D.2 Ri W-N-L-00001
R = approx. 11 mm
Ri
100
D.2
DROPPER
SU SPENSION SEATPOST
ST
D.2
Dim. E approx. 90 mm
Available dimensions, Feb. 2023
Subject to change without notice.
x= rider weight up to 115kg
x= rider weight up to 130kg
Travel Ø D.2 ST-Ri
[mm] 30.9 31.6 33.9 34.9
T80 x x x x
Technical dimensions, as of Jan. 2023, subject to change at any time. Fig. 5.2.1
Offset approx. 17 mm

5/20
Installation + Operating Instructions D.2 ST-Ri Seatpost
6. SPRING ELEMENTS
For the adjustable parallelogram suspension D.2 ST-Ri
seatpost, several spring elements with different char-
acteristics are offered, which can easily and quickly be
changed. Based on the following table, you can orient
yourself in the choice of the right suspension element,
whereby the criteria rider weight, riding position and riding
prole should be included in the decision.
For the D.2 ST-Ri, several suspension elements with differ-
ent spring settings are available: Soft, Medium, Standard,
and Hard for riders with a body weight from 45 to 130 kg
(see Table 5.2 Technical dimensions). The silver-colored
at wire steel springs with internal elastomer are marked
with a color code that shows their characteristics.
Length approx. 72mm
Basic color silver with color code
for hardness prole / driver weight
Maximum rider weight =
Weight of the rider + additional weight (e.g. backpack).
Only use the original by,schulz suspension elements for
the D.2 seatpost. The use of third-party parts can com-
promise the function of the seatpost and lead to accidents
with material damage or personal injury. In addition, this
will void the claims from liability for material defects and
warranty!
Dim. Happrox. 215 mm
Dim. Fapprox. 445 mm
Dim. Iapprox. 305 mm
Dim. Gapprox. 80 mm
Dim. Japprox. 40 mm
D.2
DROPPER
SU SPENSION SEATPOST
ST
D.2
100
Ri
5.2 TECHNICAL DIMENSIONS
A - Max. installation depth incl. cable guide
B - Min. installation depth incl. cable guide
C - Min. retracted body height
D - Max. retracted body height
E - Installation space for Ri cable routing
F- Overall length
G- Adjustment range / travel
H- Min. extended body height
I - Max. extended body height
J- Ri Trigger unit
Available dimensions, Feb. 2023
Subject to change without notice.
x= rider weight up to 115kg
x= rider weight up to 130kg
Fig. 5.2.2
RED
GREEN
BLUE
YELLOW
COLORCODE HARDNESS GRADE

6/20 Installation + Operating Instructions D.2 ST-Ri Seatpost
Exploded view D.2 ST-Ri - as of Jan. 2023, subject to change without notice
7. SEATPOST COMPONENTS
SEAT CLAMP / forged Aluminium :
1. Seat clamp - assembled
1.1 O-Ring (2x)
1. 2 Seat clamp base for Ø7 saddle rails (2x)
1.3 Seat clamp pressure spring (2x)
1. 4 Seat clamp upper part for Ø7 saddle rails (2x)
1. 5 Seat clamp screw Torx T25 with washer (2x)
(optional: Allen key 5 mm)
HEAD / forged Aluminium :
2.1 Head base part with ne toothing
2.2 Elastomer recoil damper (2x)
SPRING ELEMENT :
3. Spring element consisting of:
- Flat wire steel spring
- Central elastomer damper
- Spring end-cap with centering pin (2x)
SPRING ARM / forged Aluminium :
4. Spring arm - assembled
4.1 Elastomer - stop damper (2x)
4.2 Spring arm with spring plate (2x)
4.3 Grub screw M5 (4x) - Allen key 2.5 mm (4x)
4.4 Small Igus plain bearing, inner Ø 6.5 mm, (4x)
4.5 Small stainless steel pin, outer Ø 6.5 mm, (2x)
4.6 Large stainless steel pin, outer Ø 8 mm, (2x)
4.7 Large Igus plain bearing, inner Ø 8 mm, (4x)
INNER TUBE / 3D forged Aluminium :
5.1 Gas spring screw M6x24; hexagon socket 3mm
5.2 Threaded sleeve; hexagon socket 7mm
5.3 Inner seatpost tube D.2 ST-Ri
5.4 by,schulz linear guide rails / IGUS (4x)
5.5 by,schulz slotted lower plain bearing / IGUS
OUTER TUBE / Aluminium :
6.1 Axial sealing ring
6.2 Ring nut with axial seal ring mount
6.3 by,schulz upper slotted plain bearing / IGUS
6.4 Stop ring / plastics
6.5 Outer seatpost tube with thread and
internal guide grooves
6.6 Slotted hole for xing screw
GAS PRESSURE SPRING :
7. 1 by,schulz gas pressure spring
7. 2 by,schulz elastomer stop damper D.2 ST-Ri
TRIGGERING MECHANICS Ri / Aluminium :
8.1 O-ring
8.2 Fixing screw M4x5,8; hexagon socket 2 mm
8.3 Release unit Ri
8.4 Cable retaining bolt
1
4.5 4.4 4.3 4.14.2
4
1.5
1.3 1.41.1 1.2
2.1
2.2
5.1
5.2
5.3
5.5
5.4
4.6 4.7
3

7/20
Installation + Operating Instructions D.2 ST-Ri Seatpost
DROPPER LEVER Ri / Aluminium
CLAMP BASE :
1. 1 Clamp with ne toothing (2x)
1. 2 Clamp base / Aluminium
1. 3 Adhesive elastomer pad
1. 4 O-ring
1. 5 Countersunk screw M4x8, Torx T20
1. 6 Clamp band / Stainless steel, black anodized
1. 7 Clamp screw with at head M5x14, Torx T20
with screw guide
LEVER BASE :
2.1 Cover
2.2 Cylinder head screw with washer
2.3 Countersunk screw M4x24, Torx T20
2.4 Stop adjustment screw M6 with compression spring,
hexagon socket 2.5 mm
2.5 Lever base Ri
2.6 O-ring
2.7 Adjusting sleeve
2.8 Compression spring for adjusting screw
2.9 Adjustment screw M5 for cable guide
REMOTE LEVER :
3.1 Snap ring
3.2 Industrial ball bearing
3.3 Counterholder ball bearing
3.4 Screw cap
3.5 Remote lever Ri / Aluminium
3.6 Grub screw M4x5 + M4x6, hexagon socket 2 mm
6.1
6.2
6.3
6.4
6.5
6.6
7.1
7.2
8.1
8.2
8.38.4
1.5 1.1 1.2 1.3 1.5 1.6 1.7
2.32.4
2.1
2.2
2.6 2.7 2.8
3.6
3.5
3.3
3.4
3.2
3.1
1.4
2.9
2.5

8/20 Installation + Operating Instructions D.2 ST-Ri Seatpost
8. INSTALLATION REQUIREMENTS
1. The by,schulz D.2 ST-Ri seatpost is designed for rout-
ing the cable housing inside of the frame. Not all bicycle
frames / e-bike frames are suitable for routing internal ca-
ble housing. An existing opening for the cable routing on
the frame is necessary.The cable routing must not be bent
or squeezed along its entire length! For e-bikes, it must
also be possible to route the cable along the battery and
the motor.
2. Before mounting, make sure that there is sufficient
space in the bicycle frame for the installation of the D.2
ST-Ri seatpost and that the seatpost does not collide with
other parts of the bicycle or bends in the frame geometry,
the battery or the motor!
3. Check that the width of the saddle rail is compatible with
the head of the seatpost. It must not be less than 35 mm
on the inside (Fig. 8.3.1). There are some saddles (e.g.
core leather saddles) that are too narrow in the front part
of the frame and therefore cannot be combined with this
seatpost.The use of the D.2 is not recommended as it can
permanently damage the saddle and the support.
permanently damage the saddle and the support.
min.
35mm
ca. 34mm
Fig. 8.3.1
4. The D.2 ST-Ri has a saddle clamp for round saddle rails
with a diameter of 7 mm as standard. If required, saddle
clamps for 8 mm diameter are available. Never combine
7 mm clamps with an 8 mm diameter saddle rail, or vice
versa. Saddles with oval saddle rails must not be used in
combination with the D.2!
5. Check if the minimum insertion depth of the seatpost of
100 mm can be maintained!
This is marked on the back of the seatpost tube (STOP
min. insert) below the extension scale. Above the scale
you will nd the production serial number (Fig. 8.5.1).
6. If the minimum insertion depth specied by the frame
manufacturer differs, this must also be taken into account.
The higher value is crucial. Failure to observe the mini-
mum insertion depth can lead to falls or damage to the
seatpost and/or the frame.
7. The clamping force of the seatpost clamp with bolts
should not exceed 5 - 6 Nm when xing the seatpost in
the frame. Use a torque wrench for this. (Fig. 8.7.1)
With a quick-release lever, the correct clamping force must
be determined by trial and error. It must not be possible to
push the D.2 into the frame or twist it. (Fig. 8.7.2)
max. 5 - 6 Nm
Fig. 8.7.1 Fig. 8.7.2
Exceeding the clamping force can lead to malfunctions
such as reduced extending or retracting speed and to
damage to components of the D.2 ST-Ri and must be
avoided.
NOTE: Plan the assembly as well as the cable
routing carefully. Make sure that the inner cable and
the housing are long enough for the planned instal-
lation route through the frame! Remove any burrs on
the seat tube of the bike.All parts must be clean for in-
stallation! Check before installation that the diameter
of the dropper post ts the diameter of the seat tube!
Serial Nr.
Min. insertion depth
Fig. 8.5.1

9/20
Installation + Operating Instructions D.2 ST-Ri Seatpost
Dimensions:
Dim. A- Min. installation retracted: ca. 135 mm
Dim. B- Min. installation height extended: ca. 215 mm
Dim. C- Max. required installation depth: ca. 230 mm
(plus cable)
Dim. D- Total length extended: ca. 445 mm
c
AB
C
D
Fig. 8.9.1 Fig. 8.9.2
9. Dimensions of the retracted and extended seatpost
NOTE: As a result of the parallelogram suspen-
sion, the D.2 ST-Ri has a greater installation height than
conventional dropper posts. Check these requirements
as accurately as possible in advance by measuring on
your bike. Also note that the individual height of your
saddle must be added for the correct seating position.
Regardless of the installation depth of the post, you
should still have a secure footing with your front foot
on the ground when the seatpost is fully lowered (Fig.
8.9.1)! If this is not the case, we advise against using
the support in combination with this bike.
8. The diameter of the seat tube of your bicycle / e-bike
should match that of the seatpost. Any reduction sleeves
required must have a minimum length of 100 mm and
must always be fully inserted into the frame.
If the frame manufacturer's specications differ with re-
gard to the sleeve length, these must also be taken into
account. The higher value is then crucial!
You can nd the by,schulz G.Shim reducing bushes at:
https://byschulz.com/product/g-shim-reducing-
sleeve/?lang=en
Double slotted sleeve
Ø 34,9 > 31,6
Ø 34,9 > 30,9
Ø 33,9 > 31,6
Ø 33,9 > 30,9
120mm

10/20 Installation + Operating Instructions D.2 ST-Ri Seatpost
Fig. 9.3.2
9. INSTALLATION
9.1 Tools
You will need the following tools and aids to install the
seatpost:
1. Torque wrench (2 - 20 Nm) with interchangeable bits:
Torx T20 / T25, hexagon socket 2 / 2.5 mm.
2. Bowden cable cutter, side cutter (optional)
3.Assembly grease (metal frame), or assembly paste (car-
bon frame) and cleaning agent
Optionally, a round le for removing sharp edges in the
seat tube of the frame, as well as pliers for tensioning the
inner cable, can be helpful.
9.2 Preparation
To be noted before assembly:
Measure and note the previously set saddle height. This
will make it easier for you to adjust the mounted D.2 ST-Ri
seatpost later. Remove the existing seatpost and saddle.
Clean the seat tube of the frame and check it for burrs.
If necessary, deburr the seat tube with e.g. a round le.
Only shorten the cable housing and the inner cable after
you have installed the parts for testing and checked the
cable length.
For frames made of metal, we strongly recommend that
you grease the inside of the upper part of the seat tube.
Any reduction sleeve used should also be greased. This
ensures smooth height adjustment of the seatpost later
on. Do NOT use grease on frames made of carbon bre
reinforced plastic (carbon). Use an assembly paste for
components and frames made of carbon instead.
With small bicycle frames or frames with bottle cage eye-
lets in particular, it is possible that the seatpost cannot be
inserted far enough into the seat tube of the bike. In this
case, the D.2 cannot be installed!
The remote lever of the by,schulz D.2 ST-Ri seatpost is
preferably designed for mounting on the left side of the
handlebar, but can be mounted on both sides. Locate a
good position on your handlebars. It may be necessary to
slightly move existing controls such as brake levers and
other attachments. The clamp usually ts under gearshift
indicators or controls. Afterwards, make sure that all con-
trols still work and are in a position that is easy for you to
reach.
9.3 Mounting the remote lever:
1. Slide the open clamp band onto the handlebar tube at
a good position. The handle does not have to be removed
for this. The O-ring on the open screw serves as an an-
ti-loss protection. Bend the clamp band by hand and screw
the M5 clamp screw lightly into the clamp base with a Torx
T20 tool so that the remote lever can still be positioned
later.
Fig. 9.3.1
The position and alignment of the clamp base, the lever
base and the remote lever can be adjusted in many ways
to suit your wishes and needs.
2. The clamp base can be positioned by moving it along
the handlebar or by rotating it around the handlebar tube.
(Fig. 9.3.2)
NOTE: All parts of the D.2 ST-Ri are technically
matched to each other. Only use an original by,schulz
remote lever. If products from other manufacturers
are used, the proper function of the D.2 ST-Ri dropper
post cannot be guaranteed!