White brothers cycling ULTRALIGHT User Manual
OWNERS MAN UAL
series
SC72UL#
SC92UL
Owners Name:
Address:
Phone:
Purchase Date:
Purchase Location:
Serial #
: Located on backside of right fork leg
Fork Model:
Steer Tube Length:
Bike Brand:
Frame Size:
Safety
1.) NEVER REMOVE STEER TUBE FROM CROWN. THIS IS A PRESSED IN PART,
REMOVING IT WILL RENDER BOTH CROWN AND STEERER INOPERABLE*.MAKE
SURE YOUR FORK CAPS AND ALL FORK HARDWARE (brake studs,pinch bolts,
etc.) ARE TIGHT
2.) DO NOT PERFORM ANY MODIFICATIONS OR ADJUSTMENTS THAT ARE NOT
OUTLINED IN THIS MANUAL.SEE THE TUNING SECTION OF THE MANUAL FOR
MORE DETAILS.
3.) INSPECT YOUR FORKS BEFORE EVERY RIDE.INSPECT THE CROWN,TUBES AND
AXLE SEAT AREAS FOR ANY SIGNS OF FATIGUE,BENDING,CRACKING OR OTHER
DAMAGE.IF YOU NOTICE ANY TYPE OF DAMAGE,DO NOT RIDE ON THEM.
RETURN THEM TO YOUR DEALER FOR A COMPLETE INSPECTION AND NECESSARY
REPAIR OR WARRANTY STEPS.PLEASE REFER TO THE WARRANTY SECTION OF
THIS MANUAL.
4.) PERFORM ALL RECOMMENDED MAINTENANCE ACCORDING TO THE MAINTENANCE
SECTION OF THIS MANUAL.FAILURE TO PERFORM MAINTENANCE COULD
DRASTICALLY REDUCE YOUR FORKS LIFE AND PERFORMANCE.
5.) WHITE BROTHERS RECOMMENDS THAT YOU WEAR PROPER SAFETY EQUIPMENT
EVERY TIME YOU RIDE,INCLUDING A APPROVED BICYCLE HELMET.NEVER RIDE
AT NIGHT WITHOUT LIGHTS!
* IF SERVICE BECOMES NECESSARY OR REMOVAL OCCURS, PLEASE CALL WHITE BROTHERS CUSTOMER SERVICE
FOR PRODUCT EVALUATION AND DIAGNOSIS.
Fork Log
1
TABLE OF CONTENTS:
SECTION ONE...................Applications..............................................PAGE 1
SECTION TWO
.................Fork Installation.................................PAGE 2
SECTION THREE
..............Tuning.................................................................PAGE 3-5
SECTION FOUR
................Maintenance.............................................PAGE 6-8
SECTION FIVE
...................Exploded Views...................................PAGE 9-10
SECTION SIX
......................Warranty..........................................................P A GE 13
Applications
Thanks for purchasing your new White Brothers Fork. You are in for the best ride of your
life. Our forks are designed to give you the level of performance you need to ride at your
absolute peak.
The White Brothers Ultra Light Series forks features a lightweight air damper design. This
damper is very easily adjusted for a wide range of riding requirements. Additional tuning can
be accomplished by adjusting negative spring preload or changing the negative springs to a
different style. Steering accuracy is improved over conventional MTB forks by the utilization of
superior materials and design. These include oversized 31.75mm fork tubes,a torsion box
design steering crown with pressed-in tubes (SC72/92UL models),an extruded magnesium
heavy duty brake bridge,and extra-thick machined drop-outs. Fork travel has been chosen to
offer the best performance possible for each forks intended use.
Every possible effort has been made to make the White Brothers Forks very light in weight
and perform at a level superior to other forks on the market. To insure peak performance,
proper installation and periodic maintenance is required. Please read this manual in its entirety to familiarize yourself with the fork and insure your satisfaction with this product.
White Brothers Forks are designed for offr
oad use only. They are not equipped with proper
reflectors for on-road use. If you are going to use your forks for road use,have your dealer or
mechanic install reflectors that meet the Consumer Product Safety Commission’s (C.P.S.C.)
requirements for bicycle standards. If you have any questions concerning C.P.S.C.Standards,
please talk to your dealer.
When using your forks on public land and trails,please respect the rights of other users and
stay on established paths and trails. By mounting biking responsibly,you help to insure the
future of our sport.
Fork Installation
White Brothers Ultra Light Series forks features a 1 1/8” threadless steerer tube. If you have a
threaded type fork on your bicycle,consult your dealer for the appropriate upgrade parts nec-
essary to convert to a 1 1/8”threadless steerer tube.
1.) Remove old forks from the bicycle. See your bicycle’s owners manual. Measure the diameter and
length of your old forks steerer tube to insure that the White Brothers fork steerer tube is the correct
diameter and has sufficient length for the installation.
2.) Remove the cr o wn r ac e from your old forks.Note:Replace the bearings if there are any signs of wear
or corrosion
3.) P ress the cro wn rac e onto the steer er of y our White Brothers fork (figure 1).
4.) Preassemble headset by: Sliding fork steerer tube through headset
bearings.Then install top headset, stem spacer (optional),and steering stem onto fork steerer tube. Refer to headset owners manual if
you have any questions about this preassembly.
5.) Mark steerer tube at top of steerer stem. Steerer must then be cut
3mm (1/8”) below this mark. Consult a dealer or mechanic if you do
not have the proper tools for cutting the steerer tube.
6.) The special star fangled nut must now be installed into the steerer.
We recommend dealer installation of this part since a special tool is
required.
7.) Clean and grease all headset bearings and races to prepare them for
assembly.
8.) Now assemble headset as done in Step 4 (figure 2).
9.) Install the steering stem (threadless type is required) and handle-
bars. Set your bars to your desire height.
10.) Install the threadless mounting cap. Tighten the top threadless
stem bolt until there is no play in the fork tube. The forks should
rotate freely in the head tube. S ecure the pinch bolts on the steering stem. Consult the installation instructions for your threadless
bearing set to insure correct installation and tension of the headset.
11.) Install your front brakes and adjust following the manufactures
specifications.
12.) Adjust quick release hub on your front wheel to clear the secondary catches of the forks. The quick release must be tightened after it
is properly seated into the dropout counter bores. Insure that there
is sufficient thread engagement (5 or more threads with the release
adjusted to lock) due to the thicker White Brothers fork dropouts.
Install front wheel to bicycle per manufacturers specification.
13.) Check to see that your br akes are adjusted and w orking.Make
sure brake cable doesn’t foul on any part of bicycle when fork is com-
pressed and released.
2
headset bearings
lower race
top race
steering stem
headset bearings
spacer (optional)
figure 1
figure 2
3
Tuning
To get the most from your White Brothers Pro Forx it is important that you tune the forks to fit your style of
riding and the conditions you ride in.
Initial break-in period
Your new fork is designed to break-in over a period of 10 hours or more of riding. As all of the parts bed
into each other, the stic tion (friction) of the forks will reduce and the forks will absorb the bumps better.
After this initial break-in,fine tuning the spring preload and car tridge damper may be beneficial to achieve
the best possible fork performance for your weight and riding style.
Adjustment and Maintenance
.Valve wrench (provided)
.4mm allen wrench
.rear shock pump or other high pressure pump (WB pn 97-725)
.Air Tight Adapter (WB pn 97-726)
.Neutral Shaft Retainer Pin Spanner (WB pn 97-716)
The White Brothers Ultra Light Series forks has been fitted with Total Air cartridges for spring and damping. Total Air cartridges are lightweight, adjustable air-sprung shock absorbers which screw into the fork
stanchions at the crown. The following guidelines for checking and adjusting your cartridges will enable you
to enjoy maximum performance from your fork.
1) IMPORTANT! Always before riding the fork, push down on the bars hard with all your body weight to
check for sufficient air pressure in your Total Air cartridges. The fork should not bottom out easily (if more
pressure is needed,see No.4 through 6 below).
2) Test ride the fork first over easy terrain. If after riding over a variety of terrain you decide that tuning is
necessary,go on to the next section. Before beginning,make sure you have the necessary tools.
Compression Adjustment
3) The compression or overall “spring”of the fork can be changed two ways;by changing air pressure and by
resetting the adjuster. Either change requires re-inflation of the cartridges. Rebound adjustment is done
by changing adjusters.
4) If the forks feels too soft or firm,try changing the air pressure as follows:
SC72UL
Rider Wt.(lbs.) Plush Ride Firm Ride
100-120 110-140 psi 125-150 psi
120-140 130-155 psi 140-160 psi
140-160 140-165 psi 150-170 psi
160-180 150-175 psi 160-180 psi
180-200 160-185 psi 170-190 psi
200-220 170-190 psi 180-200 psi
220- 180-195 psi 190-210 psi
SC92UL
Rider Wt.(lbs.) Plush Ride Firm Ride
100-120 105-110 psi 115-125 psi
120-140 110-125 psi 125-135 psi
140-160 125-140 psi 140-150 psi
160-180 140-155 psi 155-165 psi
180-200 155-165 psi 165-175 psi
200-220 165-170 psi 175-185 psi
220- 170-180 psi 185-195 psi
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