Quick Tip - Use a flat washer for less resistance and use a cupped washer for more resistance. This will help you customize your setup on all formulas.
The APS 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 rotate the bushing around the kingpin by hand. APS Offers the highest range of harnesses for all riding disciplines.
The WFB compound has a unique lubrication added that does not bond with the urethane. This is why you will often see a white residue powder on the surface. This compound offers reduced bushing friction for fast transitions and a deeper lean than the APS with less pushback to center. WFB will turn 15% to 20% more than the same durometer of other brands (So buy accordingly). 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 his 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 rotate the bushing around the kingpin by hand.
The KranK compound is designed specifically to change feel 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 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.