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WBUD150
User Manual
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White brothers cycling WBUD150 User Manual

OWNERS MANUAL FOR
WHITE BROTHERS UD-150
DOWNHILL
WHITE BROTHERS CYCLING A DIVISION OF EKO SPORT, INC.
580 NORTH WESTGATE DR.
GRAND JUNCTION, CO 81505
WWW.WHITEBROTHERSCYCLING.COM
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 FORK 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 YOUR FORK.. RETURN IT 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 FORK’S LIFE AND PERFORMANCE.
5.) WHITE BROTHERS RECOMMENDS THAT YOU WEAR PROPER SAFETY EQUIPMENT EVERY TIME YOU RIDE, INCLUDING AN APPROVED BICYCLE HELMET. NEVER RIDE A T NIGHT WITHOUT LIGHTS!
* IF SERVICE BECOMES NECESSARY OR REMOVAL OCCURS, PLEASE CALL WHITE BROTHERS CUSTOMER SERVICE FOR PRODUCT EVALUATION AND DIAGNOSIS.
APPLICAT IONS
Thanks for purchasing your new White Brothers Pro Forx. 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 Pro Forx UD150 features a lightweight coil spring and a sealed, externally adjustable cartridge damper. This technology is borrowed from motorcycling and offers the best possible suspension action. Steering accuracy is improved over conventional MTB forks by utilizing dual billet aluminum steering crowns, oversized 31.75mm fork tubes, inverted stanchion/slider design and large 20mm axle. Fork travel has been set at 6” to offer the best performance for downhill racing terrain. High-cushion bottom bumpers are used to minimize hard bottoming.
Every possible effort has been made to make the White Brothers Pro Forx 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 Pro Forx are designed for off-road 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.
Copyright 2001, Eko Sport, Inc. All Rights Reserved.
FORK INSTALLATION
TUNING
White Brothers Pro Forx UD150 feature 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 necessary to convert to a 1 1/8” threadless steerer tube.
NOTE: Some frames are not adequately reinforced to handle loads applied by stiffer dual crown forks. Check with your frame manufacturer to verify dual crown fork compatibility
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 Pro Forx steerer tube is the correct diameter and has sufficient length for the installation.
2.) Remove the crown race from your old forks. Note: Replace the bearings if there are any signs of wear or corrosion
3.) Press the crown race onto the steerer of your White Brothers Pro Forx (figure 1).
4.) Preassemble headset by: Sliding fork steerer tube through headset bearings. Then install top headset, top crown, 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 nut 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 top steering crown. Install the steering stem (threadless type is required) and handlebars. 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. Secure 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.) TIRE CLEARANCE: The fork tubes can be adjusted up or down in the fork crowns to adjust ride height and steering geometry. NOTE: At full extension of the fork, a minimum of 6” (152mm) clearance must exist between the tire and the bottom of the steering crown. DANGER: Any less clearance than this will allow the tire to contact the bottom of the crown when the forks are fully compressed. Next check to make sure the top of the fork tubes fit all the way through the top steering crown. If insufficient clearance exists, you must switch to a smaller diameter front tire.
12.) Install your front brakes and adjust following the manufacturers specifications. See additional instructions below. NOTE: Only disc type brakes can be used with the White Brothers Pro Forx UD150.
13.) WHEEL/BRAKE INSTALLATION: The White Brothers Pro Forx UD150’s are designed for a downhill type hub utilizing a 20mm axle. Install front wheel with disc rotor next to left side of fork. Slide axle all the way through. Make sure disc rotor doesn’t contact left fork axle seat when axle is tightened fully. If it does, a custom spacer will have to be fabricated to space hub/rotor away at least 3mm from left fork axle seat. At this time the brake caliper should be mounted and alignment checked with the disc rotor. Follow the disc brake manufacturers installation instructions to insure correct brake rotor brake caliper alignment
14.) RIM CENTERING: See your dealer or professional wheel builder to have the rim of your choice laced to your downhill hub. The wheel builder will need to lace the rim so that it is directly centered between the fork legs.
15.) FINAL WHEEL INSTALLATION: Lightly grease front axle and install front wheel to forks. Tighten axle completely. Now tighten both left and right fork axle seat pinch bolts. Follow the disc brake manufacturers installation instructions and recommended torque for mounting brake caliper to left fork leg.
16.) Route hydraulic brake cable up to the brake lever. Make sure that the cable is routed so that it cannot foul on tire, fork crowns, or steering stops through full up and down fork travel and side to side steering radius.
17.) Check to see that your brakes are adjusted and working.
18.) STEERING CLEARANCE: Due to the White Brothers Pro Forx double crown design, the fork tubes or fork steering crowns will contact the bicycle frame at full steering lock to the left and right. To eliminate the chance of damage to the fork or frame, a cushion stop must be fabricated to eliminate metal to metal contact. For bumpers, elastomers or thick pieces of rubber will work fine. Secure cushion stop to the frame or fork
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 in which you ride . 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 stiction (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 cartridge damper may be beneficial to achieve the best possible fork performance for your weight and riding style.
Tuning Your Springs
There are two ways to adjust your forks. The first is by changing the spring pre-load or changing the spring for a completely different rate. The spring basically controls the quality of the ride. Stiff springs handle major obstacles and drops better, but don’t give as smooth of ride over braking bumps and other small obstacles. Your White Brothers Pro Forx comes with a standard rate spring installed, with the preload adjusted to zero. Note: Zero spring preload means the preloader is just touching the spring, and the spring is under no tension (at full fork extension). For the majority of riders, this should give a compliant ride, yet remain resistant to bottoming. Pre-load should be set, then left alone. If you feel your forks are bottoming too easily, then switch to the heavier spring supplied with your forks. Your pre-load should be set with 1/4” to 1/8” of free sag. This means that with no load on the bike, the forks should come within 1/4” to 1/8” of returning to full extension after compressed. If forks are too stiff or too soft with either of the springs supplied, WB offers an optional Soft and X-Heavy Fork Spring (see Spring Rate Chart on page 12). Contact your WB dealer to order these.
Tuning Your Cartridge
Because of your forks coil spring, you will notice the forks have far better action than other mountain bike forks you might have used. Adjusting the cartridge should only be done after you are completely happy with your spring choice, and the proper sag has been set. Your White Brothers Pro Forx UD150 comes with the cartridge adjusted in the middle of its’ range. The standard setting is 8 clicks out from all the way in (clockwise). Use the following guide lines to determine if further adjustment is needed.
A) If your forks rebound too slowly, turn the adjustment knob on the top of the right fork leg all the way counter-clockwise (10 turns out is the maximum). The forks should absorb and return fast enough to absorb the next major obstacle. A sign that your forks are rebounding too slowly is if they feel like they pack-up or continue to compress as you go through rough sections.
B) If your forks are rebounding too fast, turn the adjustment knob on the top of the right fork leg clockwise two clicks at a time. A sign of too fast of rebound is if the forks deflect and the bicycle is hard to hold in lines. The front wheel will also bounce and appear “busy” ie. You get an additional bounce after landing from a drop. NOTE: The damper adjuster also has some affect on compression damping. As you turn in (clockwise) the damper adjuster, both the compression and rebound damping will become slower. If a stiffer spring is installed, your standard setting should be two positions stiffer (clockwise). A light rider that has installed a softer spring will usually be most satisfied with the damping set at the lightest position (10 turns out).
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