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4 950-006020-00, REV. A01
E
NGLISH
R
OCK
S
HOX
, I
NC
.
I NSTALLATION
It is extremely important that your RockShox fork is installed correctly by a qualified bicycle
mechanic. Improperly installed forks are extremely dangerous and can result in severe and/or
fatal injuries.
1. Remove the existing fork from the bicycle and the crown race from the fork. Measure the length of the fork steerer
tube against the length of the RockShox steerer tube. The RockShox steerer tube may need cutting to the proper
length. Make sure there is sufficient length to clamp the stem (refer to the stem manufacturer's instructions).
2. Install the headset crown race (29.9mm for 1 1/8" steerers) firmly against the top of the fork crown. Install the fork
assembly on the bike. Adjust the headset until you feel no play or drag.
3. Install the brakes according to the manufacturer's instructions and adjust brake pads properly. Use the fork only with
V-type or hydraulic cantilever brakes mounted to the existing brake posts or disc style brakes mounted through the
provided mounting holes. Do not use any cantilever brake other than those intended by the brake manufacturer to
work with a hangerless brace.
4. Adjust the front wheel quick release to clear the dropout's counter bore. The quick release nut must be tightened
after the wheel is properly seated into the dropout's counter bore. Make sure four or more threads are engaged in
the quick release nut when it is closed. Orient the quick release lever in front of and parallel to the lower tube in the
locked position.
5. Keep in mind tire clearance as you choose tires. Maximum size is 2.4" wide or 348 mm radius installed. Be sure to
check this radius whenever you change tires. To do this, remove the top caps and spring stack assemblies and compress
the fork completely to make sure at least 5 mm of clearance exists between the top of the tire and the bottom of the
crown. Exceeding maximum tire size will cause the tire to jam against the crown when the fork is fully compressed.
P ERFORMANCE TUNING
RockShox Judy forks can be tuned for your particular weight, riding style, and terrain.
Setting Sag
Judy forks are designed to sag when you are sitting on your bike. Sag is the compression of the fork
caused by the rider's weight. Proper sag allows the front wheel to follow the contour of the terrain
as you ride. Sag is adjusted by the amount of air you add to the fork (less air equals more sag).
AIR PRESSURE GUIDELINES
%of Travel:
Rider Weight (lb) Air Pressure Sag 80 mm 100mm
<140 (63 kg) — 18-25 mm 22-31% 18-25%
140-160 (63-72 kg) 0-5 psi 18-25 mm 22-31% 18-25%
160-180 (72-81 kg) 5-10 psi 18-25 mm 22-31% 18-25%
180-200 (81-90 kg) 10-15 psi 18-25 mm 22-31% 18-25%
>220 (99 kg) 15-20 psi 18-25 mm 22-31% 18-25%
To measure sag, install a zip tie on the upper tube of the fork flush against the wiper seal. Sit on
the bike with normal riding apparel. Step off the bike, and measure the distance between the
wiper seal and the zip tie. This is your sag.
DO NOT ADD THREADS TO ROCKSHOX THREADLESS STEERERS. THE STEERER
TUBE CROWN ASSEMBLY IS A ONE-TIME PRESS FIT. REPLACEMENT OF THE
ASSEMBLY MUST BE DONE TO CHANGE THE LENGTH, DIAMETER OR HEADSET
TYPE (THREADED OR THREADLESS).
DO NOT REMOVE OR REPLACE THE STEERER TUBE. THIS COULD RESULT IN
THE LOSS OF CONTROL OF THE BICYCLE WITH POSSIBLE SERIOUS AND/OR
FATAL INJURIES.
WARNING
!