Urethane Formulas Explained

APS™ FORMULA: ANIMATED POLYMER SYSTEM

As the name implies, this compound is very lively and offers high rebound with lots of control and lean. For the same durometer, the APS will turn 10% to 15% more than the same durometer of other brands. In addition, the APS does not change much when you tighten the kingpin nut past snug. We recommend tightening to the point where it is difficult to turn the bushing in the bushing seat by hand. Use a flat washer for lower resistance and a cupped washer for higher resistance.

WFB™ FORMULA: WORLD’S FASTEST BUSHINGS

This compound has a unique internal lubrication that does not bond with the urethane which is why you will often see a white residue on the surface. The internal lubrication has been designed to slowly eke out of the urethane over a period of about 5 years. This compound offers reduced bushing friction for fast transitions and a deeper lean than the APS. WFB will turn 15% to 20% more than the same durometer of other brands. WFB also offers lower rebound than APS and is designed for the rider that wants a very fluid response. Truly the bushing of choice for the more experienced rider that wants to control the bushings instead of the bushings controlling him or her. Like APS, the WFB compound does not change much when you tighten the kingpin nut past snug. We recommend tightening to the point where it is difficult to turn the bushing in the bushing seat by hand. Use a flat washer for lower resistance and a cupped washer for higher resistance.

KRANK™ FORMULA: PERFORMANCE UNDER PRESSURE

Our highest rebound formula to date, KranK is designed specifically to change under pressure and is controlled by the amount of clamp pressure you subject it to when tightening the King Pin nut! The effective range of control is from barely snug for the loosest feel to 2 full turns past snug for the tightest feel. KranK will turn the same or less than the same durometer of other brands which is also a departure from APS and WFB. As for washers, flat washers work great with this compound, but for the greatest control and range of this performance feature, use cupped, precision flat or precision cupped washers.