Rock Shox BoXXer R2C2 User manual

2011 Technical Manual

GEN.0000000003185 REV A2
TABLE OF CONTENTS
GETTING STARTED .......................................................................................................................................................................................................................................3
PARTS ................................................................................................................................................................................................................................................................................3
TOOLS ................................................................................................................................................................................................................................................................................3
RECORD YOUR SETTINGS.............................................................................................................................................................................................................................................4
OIL VOLUME CHART.......................................................................................................................................................................................................................................................5
TORQUE CHART...............................................................................................................................................................................................................................................................5
SERVICE INTERVALS .....................................................................................................................................................................................................................................................5
ANATOMY.........................................................................................................................................................................................................................................................................6
FORK REMOVAL .............................................................................................................................................................................................................................................8
LOWER LEG REMOVAL .................................................................................................................................................................................................................................9
SEAL SERVICE .............................................................................................................................................................................................................................................11
WIPER & OIL SEAL REMOVAL....................................................................................................................................................................................................................................11
WIPER & OIL SEAL INSTALLATION .........................................................................................................................................................................................................................11
COIL SPRING SERVICE ...............................................................................................................................................................................................................................12
COIL SPRING REMOVAL /SERVICE...........................................................................................................................................................................................................................12
COIL SPRING INSTALLATION....................................................................................................................................................................................................................................13
DAMPER SERVICE ......................................................................................................................................................................................................................................14
DAMPER REMOVAL /SERVICE ...................................................................................................................................................................................................................................14
DAMPER INSTALLATION............................................................................................................................................................................................................................................15
LOWER LEG INSTALLATION .....................................................................................................................................................................................................................17
FORK INSTALLATION..................................................................................................................................................................................................................................19

GEN.0000000003185 REV A3
This guide provides step-by-step instructions to assist in performing routine maintenance of your BoXXer front suspension fork.
PARTS
Servicing your fork will require new replacement parts such as dust seals, o-rings, oil, etc. Make sure you have all the parts available
before you begin service. Refer to the RockShox Spare Parts Catalog for a complete list of all service kits and corresponding part
numbers for the 2011 BoXXer R2C2.
TOOLS
The following chart is a list of the tools needed for service of your 2011 BoXXer R2C2. While this chart is intended to be comprehensive,
it is still only a guide. The tools required for each step of service are detailed in the text of each service section.
BOXXER R2C2 TECHNICAL MANUAL
TOOLS LOWER LEG
REMOVAL
OIL AND DUST
SEAL SERVICE
DAMPER
SERVICE
SPRING
SERVICE
LOWER LEG
INSTALLATION
FORK/WHEEL
REMOVAL/
INSTALLATION
SAFETY/STARTING EQUIPMENT
SAFETY GLASSES X X X X X X
APRON X X X X X X
RUBBER GLOVES X X X X X X
CLEAN RAGS (LINT FREE) X X X X X X
OIL PAN XXXXXX
CLEAN WORK AREA X X X X X X
BICYCLE STAND X X X X X X
WRENCHES/PLIERS
1.5 mm HEX X
4 mm HEX X
5 mm HEX X X
6 mm HEX X
12 mm SOCKET X
24 mm SOCKET X X
24 mm FLAT WRENCH X X X
TORQUE WRENCH X X X X
LARGE SNAP RING PLIERS - INTERNAL X X
MISCELLANEOUS TOOLS
PLASTIC MALLET X X X X X
LONG DOWEL ROD (PLASTIC OR WOOD) X X
SHARP PICK X X
DOWNHILL TIRE LEVER OR LARGE FLAT HEAD
SCREWDRIVER X
35 mm OIL SEAL/DUST WIPER INSTALLER X
RULER X X
OIL/LIQUIDS
5wt ROCKSHOX SUSPENSION OIL X
15wt ROCKSHOX SUSPENSION OIL X
GREASE (SUSPENSION OIL SOLUBLE) X X X X
OIL MEASURING DEVICE X X X X
ISOPROPYL ALCOHOL X X X X X X
GETTING STARTED

GEN.0000000003185 REV A4
GETTING STARTED (CONTINUED)
RECORD YOUR SETTINGS
Take a moment and record all of your BoXXer fork’s settings in the chart below. This will allow you to return your fork to its original
settings after service. Be sure to record the service date as well, this will help you keep track of service intervals.
To determine your bottom out, compression, and rebound settings perform the following:
Bottom out - Count the number of clicks while turning the bottom out adjuster fully counter-clockwise.
Rebound - Count the number of clicks while turning the rebound adjuster fully counter-clockwise.
Compression - Count the number of clicks while turning the compression adjuster fully counter-clockwise.
Spring preload will be determined later during spring system service.
MY SETTINGS
SERVICE DATE UPPER CROWN
HEIGHT
NUMBER OF
PRELOAD SPACERS
BOTTOM
OUT
LOW SPEED
COMPRESSION
HIGH SPEED
COMPRESSION
BEGINNING
STROKE REBOUND
ENDING
STROKE REBOUND
BOXXER R2C2 TECHNICAL MANUAL

GEN.0000000003185 REV A5
GETTING STARTED (CONTINUED)
The following chart lists all of the oil volumes and weights for your BoXXer as well as tool sizes and torque values for all of the
fasteners.
OIL VOLUME CHART
Damper
technology
(drive side)
Volume
(mL)
Height
(mm) Oil wt Volume (mL) Oil wt Spring
technology
(non-drive side)
Volume
(mL) Oil wt Volume (mL) Oil wt
Upper leg Lower leg Upper leg Lower leg
BoXXer R2C2 Mission Control DH 239 173 5 10 15 Coil with Drop Stop - - 40 15
TORQUE CHART
Part/fastener Tool size Torque
Maxle DH (non drive-side) 6 mm 8 clicks
Maxle DH (drive-side) 6 mm 5.7 N·m (50 in-lb)
Crown bolts 4 mm 7.3 N·m (65 in-lb)
Bottom bolts 5 mm 7.3 N·m (65 in-lb)
Top caps 24 mm 7.3 N·m (65 in-lb)
SERVICE INTERVALS
The following chart is a summary of the maintenance/service intervals for BoXXer forks. Following this schedule is important to ensure
the consistent performance and longevity of your fork. Some of the information listed may not be applicable to your fork.
Maintenance Interval (Hours)
Clean dirt and debris from upper tubes Every ride
Check air pressure (air forks only) Every ride
Inspect upper tubes for scratches Every ride
Lubricate dust seals and upper tubes Every ride
Check front suspension fasteners for proper torque 25
Remove lowers, clean/inspect bushings and change oil bath (if applicable) 25
Clean and lubricate air spring assembly 50
Change oil in damping system 100
Clean and lubricate coil spring assembly (coil forks only) 100
BOXXER R2C2 TECHNICAL MANUAL

GEN.0000000003185 REV A6
Lower Crown
Frame Bumper
Upper Crown
Bottom Bolt
Lower Leg
Upper Tube
Steerer Tube
Maxle Lite DH
Brake Hose Guides
BOXXER R2C2 TECHNICAL MANUAL
High Speed Compression Adjuster Knob
Low Speed Compression
Adjuster Knob
Bottom Out Adjuster Knob
Beginning Stroke Rebound
Adjuster Knob
Ending Stroke Rebound
Adjuster Knob
DRIVE SIDE
NON-DRIVE SIDE
ANATOMY

GEN.0000000003185 REV A7
BOXXER R2C2 TECHNICAL MANUAL
SAFETY FIRST!
At SRAM, we care about YOU. Please, always wear your safety glasses
and protective gloves when servicing your RockShox suspension.
Protect yourself! Wear your safety gear!

GEN.0000000003185 REV A8
FORK REMOVAL
If you haven’t done so already, measure and record1.
(in the “Record Your Settings” section) the distance
between the top of the lower crown and the top of
the upper tube just underneath the top cap. This will
make re-installing your fork easier.
Use a 6 mm hex wrench to loosen the Maxle™ DH2.
bolt on the non-drive-side until detent clicks are no
longer felt.
Use a 6 mm hex wrench to unthread and3.
completely remove the Maxle DH from the drive-
side. Pull downward on the wheel to remove it from
the fork.
Remove the brake caliper and disconnect the brake4.
hose from the fork.
Use a 4 mm hex wrench to loosen the four lower5.
crown and two upper crown bolts that clamp the
crowns to the upper tubes. Do not loosen the steerer
tube clamping bolt located on the upper crown.
Slide the upper tubes downward until they are clear6.
of the upper crown enough to be able to remove the
frame bumpers. Lightly re-tighten one of the lower
crown bolts to temporarily hold the fork in place.
Use your thumb and pry the thickest section of each7.
frame bumper away from the upper tube. Spray
isopropyl alcohol or water between each bumper and
upper tube. Twist each bumper back and forth until
it is loose on the upper tube. Slide both bumpers up
and off of the upper tubes.
Loosen the lower crown bolt and slide the fork down8.
through the lower crown and completely remove it
from the bike.
Use isopropyl alcohol and a lint free rag to clean the9.
upper tubes and the crown clamping surfaces.
INTRODUCTION
BOXXER R2C2 TECHNICAL MANUAL
5Copyright © SRAM LLC • 2009
GETTING STARTED (CONTINUED)
RECORD YOUR SETTINGS
Take a moment and record all of your BoXXer fork’s settings in the chart below. This will allow you to return your fork to its original
settings after service. Be sure to record the service date as well, this will help you keep track of service intervals.
To determine your bottom out, compression, and rebound settings perform the following:
Bottom out - Count the number of clicks while turning the bottom out adjuster fully counter-clockwise.
Rebound - Count the number of clicks while turning the rebound adjuster fully counter-clockwise .
Compression - Count the number of clicks while turning the compression adjuster fully counter-clockwise .
Note: Spring preload will be determined later during spring system service.
MY SETTINGS
SERVICE DATE UPPER CROWN
HEIGHT
NUMBER OF
PRELOAD SPACERS
BOTTOM
OUT
LOW SPEED
COMPRESSION
HIGH SPEED
COMPRESSION
BEGINNING
STROKE REBOUND
ENDING
STROKE REBOUND
The following chart lists all of the oil volumes and weights for your BoXXer as well as tool sizes and torque values for all of the
fasteners.
OIL VOLUME CHART
Damper
technology
(drive side)
Volume
(mL)
Height
(mm)
Oil
wt
Volume
(mL)
Oil
wt Spring
technology
(non-drive side)
Volume
(mL) Oil wt Volume
(mL) Oil wt
Upper leg Lower leg Upper leg Lower leg
Boxxer World Cup Mission Control DH 245 153 5 10 15 Coil with Drop Stop - - 40 15
TORQUE CHART
Part/fastener Tool size Torque
Maxle DH ( non drive-si de) 6 mm 8 clicks
Maxle DH (d rive-side) 6 mm 5.7 N·m (50 in-lb)
Crown b olts 4 mm 7.3 N· m (65 in-lb)
Bot tom bolts 5 mm 7.3 N·m ( 65 in-lb)
Top caps 24 mm 7.3 N·m (6 5 in-lb)
BO
XX
ER TEAM TECHNICAL MANUAL
1 2
3 5
6
7
Removing your fork from the bike is the first step required in order to perform service. BoXXer’s dual crown feature allows the
fork to be easily disassembled and removed from the bike. This provides easy access to internal components and is more
convenient than working around a complete bike.

GEN.0000000003185 REV A9
LOWER LEG REMOVAL
BOXXER R2C2 TECHNICAL MANUAL
Clamp one of the upper tubes, just below the top cap,1.
in a bike stand and place an oil pan beneath the fork
to catch any oil that will drain.
Do not scratch the upper tube while clamping it
into the bike stand. Clean any debris from the stand
clamp surface prior to clamping the upper tube. A
clean rag wrapped around the upper tube may be
used to protect the tube surface.
Use a 2 mm hex key to remove the rebound adjuster2.
knob retaining bolt. Remove the beginning stroke
rebound knob, washer, and ending stroke rebound
knob.
Use a 24 mm flat wrench to loosen and remove the3.
rebound shaft bolt. Remove the crush washer and
retainer from the bolt, then re-install the bolt two to
three turns.
Place a 12 mm socket over the rebound adjuster4.
shaft, against the rebound bolt. Use a plastic mallet
to firmly strike the socket to free the rebound shaft
from its press-fit to the lower leg.
2
3
4

GEN.0000000003185 REV A10
BOXXER R2C2 TECHNICAL MANUAL
LOWER LEG REMOVAL (CONTINUED)
Use a 5 mm hex wrench to loosen the spring shaft5.
bolts three to four turns.
Use a plastic mallet to firmly strike the spring shaft6.
bolt to free the spring shaft from its press-fit to the
lower leg. Remove the spring shaft bolt and rebound
bolt/adjuster assembly completely.
Allow the oil to drain.7.
If oil doesn’t drain from one or both sides, the press
fit(s) may not be completely released. Re-install the
shaft bolt(s) two to three turns and strike it again.
Remove the lower leg from the fork by firmly pulling8.
each upper tube out of the lower leg assembly.
Do not hit the brake arch with any tool when
removing the lower leg as this could damage the
fork. If an upper tube does not slide out of the lower
leg, the press fit on that side may not be completely
released. Re-install the shaft bolt two to three turns
and strike it again.
Allow any remaining oil in the lower leg to drain into9.
the oil pan.
Spray isopropyl alcohol onto the upper tubes and10.
clean with a lint free rag.
Inspect the upper tubes for damage.11.
Damage such as scratches, chips or wear marks on
the surface of the upper tube can cause oil to leak
during use and allow dirt and debris to contaminate
the internals of the fork. Damaged upper tubes
should be replaced.
6
8
5

GEN.0000000003185 REV A11
BOXXER R2C2 TECHNICAL MANUAL
SE AL SERVICE
Suspension fork seals are considered "wear and tear" parts and require regular maintenance. The frequency of seal replacement
will depend on the frequency of riding, riding terrain, rider body weight, and type of fork. The following chapter covers wiper and
oil seal removal and installation.
WIPER & OIL SEAL REMOVAL
Position the tip of a downhill tire lever or large,1.
flat head screwdriver underneath the lip of the
lower black oil seal, above the upper bushing.
Stabilize the lower leg upright on a bench top or2.
on the floor. Hold the lower leg firmly and use
downward force on the tool handle to
leverage both seals out at the same time.
Be sure to stabilize the lower leg in order to
prevent it from slipping while installing the seal.
Do not allow the lower legs to twist in opposite
directions, compress toward each other, or be
pulled apart. This will damage the lower leg.
Spray isopropyl alcohol on and into the lower leg.3.
Wipe the lower legs clean, then wrap a clean,
lint free rag around a dowel and clean the inside
of each lower leg.
WIPER & OIL SEAL INSTALLATION
Position the oil seal, with the grooved side1.
visible, onto the stepped side of the 35 mm seal
installation tool.
Hold one of the lower legs firmly and use the seal2.
installation tool to push the oil seal evenly and
completely into that leg. Repeat for the other
leg.
Be sure to stabilize the lower leg in order to
prevent it from slipping while installing the seal.
Do not allow the lower legs to twist in opposite
directions, compress toward each other, or be
pulled apart. This will damage the lower leg.
Position the dust wiper seal, with the grooved3.
side visible, into the recessed side of the 35 mm
seal installation tool.
Hold one of the lower legs firmly and use the seal4.
installation tool to push the dust wiper evenly
and completely into that leg. Repeat for the
opposite leg.
INTRODUCTION
1 2
3 4
1 2
3

GEN.0000000003185 REV A12
BOXXER R2C2 TECHNICAL MANUAL
COIL SPRING SERVICE
Use a 1.5 mm hex wrench to loosen the1.
bottom out adjuster pinch bolts 1 full turn each.
Remove the adjuster cap.
Use a 24 mm socket wrench to unthread and2.
remove the spring top cap. Use a pick to remove
the top cap o-ring. Apply a few drops of
suspension oil to the new o-ring and install.
Remove the spring pre-load spacer(s) then pull3.
the coil spring from the upper tube.
Using a long dowel, remove the Drop Stop4.
bumper from the coil by pushing it from the small
diameter side of the coil out through the larger
diameter side.
Use large internal snap ring pliers to remove the5.
spring shaft base plate snap ring.
Pull the spring shaft and base plate from the6.
upper tube.
Spray isopropyl alcohol on the coil spring, spring7.
isolators, spring shaft, base plate, and the
outside of the upper tube and wipe dry with a
clean rag. Inspect the spring shaft assembly for
damage. Replace entire assembly if necessary.
Check the position of the spring isolators.
There should be three isolators evenly spaced
along the coil spring with approximately 50 mm
of exposed coil at each end. If any of the
isolators needs to be re-positioned, you can
“thread” it along the coil by twisting it by hand.
Once the isolator is positioned in place, use
a heat gun or hair dryer to shrink down and
secure the spring isolators around the spring.
Gradually heat the isolators until they emit
vapors. Be careful not to get the heat gun too
close or you may burn a hole in the isolator.
Allow the area to cool before handling.
Spray isopropyl alcohol into the upper tube.8.
Wrap a clean, lint free rag around a long dowel
and insert into the upper tube to clean inside the
upper tube.
12
COIL SPRING REMOVAL /SERVICE
ISOLATORS
1 2
3 4
5 6
7 8

GEN.0000000003185 REV A13
COIL SPRING INSTALLATION
Make sure the base plate is installed on the9.
spring shaft so that the small top out spring is
oriented toward the spring perch.
Insert the spring perch, spring shaft, and base10.
plate assembly completely into the bottom of the
upper tube so that the retaining ring groove is
visible.
Use large internal snap ring pliers to secure the11.
snap ring into the snap ring groove.
Make sure the snap ring is securely fastened
in the snap ring groove. You can check this by
using the snap ring pliers to rotate the snap ring
back and forth a couple of times, then firmly
pulling down on the damper shaft.
Snap rings have two unique sides. One side
is flat edged, while the other is round edged.
Installing snap rings with the flat edge facing
the tool will allow for easier removal and
installation.
Apply fresh grease liberally to the Drop Stop12.
bumper, spring and spring isolators. Identify the
larger diameter end of the of the coil spring and
push the Drop Stop bumper into the coil from
that end.
Use a grease brush and apply a generous13.
amount of grease to the entire length of the coil
spring. Install the coil spring, with the smaller
diameter end first, into the upper tube.
Use a ruler to measure the distance from the top14.
of the coil spring to the top of the upper tube.
This distance should be at least 14 mm but not
more than 16 mm. If the measurement is greater
than 16 mm, add preload spacers until the
measurement falls between 14-16 mm (each
preload spacer is 2 mm thick).
If the distance measures greater than 16 mm and
is not corrected, the coil spring will experience
up/down play in the upper tube and the fork
will make a ‘knocking’ noise. If the distance is
less than 14 mm, the coil spring will bind in the
upper tube which can lead to damage of the coil
spring.
Clean the top cap, then apply grease to the15.
top cap threads and o-ring. Insert the top cap
into the upper tube/crown and hand thread into
upper tube. Be careful not to damage the top
cap o-ring upon installation. Use a 24 mm socket
wrench to tighten to 7.3 N·m (65 in-lb).
Re-install the bottom out adjuster cap onto the16.
top cap. Tighten the pinch bolts to
.2-.6 N·m (2-5 in-lb).
BOXXER R2C2 TECHNICAL MANUAL
910
12
11
13 14
15 16
SPRING
PERCH
TOP OUT
SPRING
BASE
PLATE
SUPPORT
WASHER
WAVY
WASHER

GEN.0000000003185 REV A14
BOXXER R2C2 TECHNICAL MANUAL
DAMPER SERVICE
DAMPER REMOVAL/SERVICE
Turn the blue high speed compression knob1.
fully clockwise, to set it to the maximum
compression
position. Record your setting by counting the
number of clicks. This will make tuning your fork
after service easier.
Use a 24 mm flat wrench to access the top cap2.
under the blue high speed compression knob.
Unthread and remove the top cap.
Remove the compression damper from the3.
upper tube by pulling up and rocking it from side
to side.
Spray isopropyl alcohol onto the upper tube4.
threads and clean them with a lint free rag.
Remove the top cap o-ring. Apply grease to the5.
new o-ring and install it. Remove the glide ring
from the compression damper piston assembly.
Apply grease to the new glide ring and install it.
Pour any remaining oil from the upper tube into6.
the oil pan.
Push the rebound damper shaft into the seal7.
head, leaving just enough shaft exposed to hold
onto with your fingers. Use large internal snap
ring pliers to remove the seal head snap ring
from the snap ring groove.
Do not scratch or damage the surface of the
damper shaft during removal of the snap ring.
Any damage will allow oil to bypass the inner
o-ring during use, resulting in decreased
damper performance and travel loss.
Orient the upper tube upright in the bicycle8.
stand. Firmly pull down on the damper shaft and
remove the rebound damper and seal head
assembly from the upper tube.
Slide the seal head off the damper shaft.9.
Use a pick to remove the inner and outer seal
head o-rings. Apply grease to the new o-rings
and install them.
Do not scratch or damage the seal head during
removal of the o-rings. Any damage will allow
oil to bypass the o-rings during use, resulting in
decreased damper performance and travel loss.
1 2
3 5
7
8
9

GEN.0000000003185 REV A15
BOXXER R2C2 TECHNICAL MANUAL
DAMPER INSTALLATION
Spray isopropyl alcohol on the rebound damper10.
shaft and clean it with a lint free rag.
Remove the glide ring from the rebound shaft11.
assembly. Apply grease to the new glide ring
and install it.
Apply grease to the seal head inner o-ring. Slide12.
the rebound seal head onto the rebound damper
shaft with the flat side of the seal head facing
away from the piston.
It is normal for some of the seal head bushing
material to come off as the damper shaft is
pushed through the seal head. Once the seal
head is installed on the shaft, slide the seal
head back and forth on the damper shaft three
to four times to help clear bushing material from
the seal head area. Remove any loose bushing
material before re-installing the rebound
assembly into the fork.
Spray isopropyl alcohol into the upper tube.13.
Wrap a clean, lint free rag around a dowel and
clean the inside of the upper tube.
Apply grease to the seal head outer o-ring.14.
Insert the rebound damper piston into the bottom
of the upper tube at an angle, with the side of the
glide ring opposite the split entering the upper
tube first. Continue to angle and rotate until
the glide ring is in the upper tube. Push the seal
head firmly into the bottom of the upper tube
until the retaining ring groove is visible.
Push the rebound damper shaft into the seal15.
head, leaving just enough shaft exposed to hold
onto with your fingers. Use large internal snap
ring pliers to secure the snap ring into the snap
ring groove.
Snap rings have a sharper-edged side and a
rounder-edged side. Installing snap rings with
the sharper-edged side facing the tool will allow
for easier installation and removal.
Make sure the snap ring is securely fastened
in the snap ring groove. You can check this by
using the snap ring pliers to rotate the snap ring
back and forth a couple of times, then firmly
pulling down on the damper shaft.
13
11
14
15
PISTON SEAL HEADDAMPER SHAFT

GEN.0000000003185 REV A16
BOXXER R2C2 TECHNICAL MANUAL
DAMPER INSTALLATION (CONTINUED)
Orient the upper tube upright in the bicycle16.
stand. Pull the rebound damper shaft down to
the fully extended position. Measure and slowly
pour 239 mL of RockShox 5wt suspension oil into
the upper tube.
You can use oil height to measure oil fill. This
method is recommended for use only when
the lower leg is attached to the fork. Pour
suspension oil into the upper tube. Compress
the fork a few times to circulate the oil
throughout the damping system. If the fork is
still on the bike, you will need to unweight the
front of the bike to allow the fork to fully extend.
Measure from the top of the upper tube to the
top of the oil level. The measurement should be
173 mm. Add or remove oil as necessary.
Apply grease to the compression damper top17.
cap threads and top cap o-ring. Insert the
compression damper into the top of the upper
tube and push downward until the damper is fully
seated in the upper tube.
Hand thread the compression damper clockwise18.
into the upper tube. Use a 24 mm flat wrench to
tighten the compression damper top cap to
7.3 N·m (65 in-lb). Reset the low speed
compression adjuster knob to its original setting
(documented in the table of the Getting Started
section).
16 17
18

GEN.0000000003185 REV A17
LOWER LEG INSTALLATION
BOXXER R2C2 TECHNICAL MANUAL
Spray the upper tubes with isopropyl alcohol and1.
wipe with a clean rag.
Clean and inspect the shaft bolts, nylon crush2.
washers, and crush washer retainers. Replace
any crush washers and crush washer retainers if
damaged.
You must clean dirty crush washers and replace
damaged crush washers. Dirty or damaged
crush washers can cause oil to leak from the
fork.
Apply a liberal amount of grease to the inner3.
surfaces of the dust wiper and oil seal.
Gently slide the lower leg assembly onto the4.
upper tubes. Make sure that the damper side
goes into the right lower leg, and the spring side
goes into the left lower leg. Slide the upper
tubes into the lower leg until you feel the spring
and damper shafts make contact with the inside
of the legs, then pull the upper tubes back out
a few centimeters to provide clearance for oil
lubrication installation.
Make sure both dust seals slide onto the tubes
correctly without folding the seals’ lip.
Invert the fork to about 455. degrees, with the
fork legs pointing upward. Measure and inject/
pour 10 mL of RockShox 15wt suspension oil into
both sides of the lower leg through the shaft bolt
holes.
Slowly slide each upper tube completely into6.
the lower leg until the shaft threads are visible
through the shaft bolt holes.
Sliding the upper tubes and lower legs
together too quickly will cause oil to spray out of
the shaft bolt holes.
Check for oil in the shaft threads. If there is oil7.
in this area, use the corner of a rag to clean and
dry the threads.
Thread the rebound damper and coil spring8.
shaft bolts into the threaded shaft ends,
through the lower leg holes. Use a 5 mm hex to
tighten the spring shaft bolt to 7.3 N·m (65 in-lb).
Use a 24 mm flat wrench to tighten the rebound
damper shaft bolt to 7.3 N·m (65 in-lb).
3
4
5 6
7 8

GEN.0000000003185 REV A18
BOXXER R2C2 TECHNICAL MANUAL
LOWER LEG INSTALLATION (CONTINUED)
Install the ending stroke rebound adjuster9.
knob, followed by the washer onto the rebound
adjuster shaft.
Apply a small amount of threadlock to the10.
rebound knob retaining bolt. Install the
beginning stroke rebound knob and retaining bolt
onto the rebound adjuster shaft. Use a 2 mm hex
wrench to tighten the bolt to 0.6-1 N·m (5-9 in-lb).
Spray isopropyl alcohol on entire fork and wipe11.
with a clean rag.
9
10

GEN.0000000003185 REV A19
FORK INSTALLATION
Slide each upper tube through the lower crown,1.
leaving enough clearance to install the frame
bumpers.
Spray a liberal amount of isopropyl alcohol or water2.
on the the inner surfaces of the frame bumpers and
re-install the bumpers onto the upper tubes.
Gently push and twist the upper tubes through the3.
upper crown. With a minimum extension of 2 mm,
position both upper tubes to extend past the top of
the upper crown by an equal amount. Measure the
distance from the top of the upper tube to the top of
lower crown. This distance must be
156 mm (+/ - 2 mm). Align the logo on the drive side
upper tube with the logo on the lower leg.
Refer to the BoXXer crown heights
diagram for proper crown height dimensions.
Improper crown height placement can cause a
reduction in handling performance, travel, and/or
cause fork damage.
Re-installing the fork onto the bike is the final step in servicing your Boxxer fork. Once you have installed the fork onto the bike,
you will be ready to ride!
INTRODUCTION
BOXXER R2C2 TECHNICAL MANUAL
2 3
156 MM (±2 MM)
TOP OF UPPER TUBE
TOP OF LOWER CROWN
MINIMUM
2 MM
TOP OF UPPER TUBE
TO
TOP OF UPPER CROWN
BOXXER CROWN HEIGHTS

GEN.0000000003185 REV A20
BOXXER R2C2 TECHNICAL MANUAL
FORK INSTALLATION (CONTINUED)
4
Use a 4 mm hex wrench to torque the four lower4.
crown bolts in an alternating fashion to
7.3 N·m (65 in-lb). Torque the two upper crown bolts
to 7.3 N·m (65 in-lb).
Re-install the brake according to the brake5.
manufacturer’s instructions. Fasten the brake hose
to the brake hose guides on the fork’s lower leg.
Position your wheel in the lower leg dropouts. The6.
hub should seat firmly in the dropouts. Be sure to
position the disc brake rotor in the caliper. Verify
that neither the rotor, hub, nor rotor bolts interfere
with the lower legs. If you are unfamiliar with
adjusting your disc brakes, see your brake
manufacturer’s instructions.
Slide the externally threaded end of the Maxle DH7.
through the drive side of the hub, until it engages the
threads of the lower leg dropout. Use a 6 mm hex
wrench to turn the drive side axle bolt and tighten the
axle into the dropout. Torque to 5.7 N·m (50 in-lb).
Use a 6 mm hex wrench to turn the non-drive side8.
axle bolt clockwise until you hear or feel 8 clicks or
you reach a torque value of 3.4 N·m (30 in-lb).
Re-check that all damping adjusters are at their9.
original positions (documented in the table in the
“Getting Started” section), or refer to the
BoXXer R2C2 Tuning Guide to aid in tuning
adjustments for the rider.
5
7 8