Owners manual
4
COILOVER HARDWARE
B8 8125 Series are equipped with dual-rate spring hardware on most models. This consists of a bottom
spring hat, a spring slider, (2) spring crossover nuts, and an upper spring seat. The spring seat and the
spring crossover nuts are installed in the proper orientation.
SPRING SEAT
The upper spring seat is threaded and can be used to adjust spring preload. Rotating the spring seat
clockwise will increase preload (lift), while rotating counter clockwise will decrease preload (lower). It’s
recommended to only adjust spring preload when the suspension is fully unloaded. This will make the
operation much easier. If the spring seat cannot be rotated by hand, use a standard 3/8” center punch,
placed in the holes, to improve leverage. Once the spring preload is set you can lock the spring seat into
position by tightening the socket head bolt.
SPRING CROSSOVER NUTS
Positioned above the spring slider and below the upper spring seat, the crossover nuts are used to adjust
the transition moment from the softer combined dual rate spring to the stier single rate. These nuts can
be rotated clockwise and counter clockwise to adjust for the desired spring transition. Rotating the cross-
over nuts against each other will lock them into place.
COILOVER SPRINGS
The B8 8125 Series use industry standard coilover springs. A 46mm(2.0”) diameter shock absorber uses a
2.5” ID coil and a 60mm(2.65”) diameter shock absorber uses a 3” ID coil. It is important that the bottom
coil, on the dual rate set up, be at least as long as the shock travel (Example: A 12” travel shock should use
a lower spring at a minimum length of 12”). To install the springs, rst slide the upper spring into position,
install the slider, install the lower spring and then install the lower spring hat. Shorter travel 5”, 6”, and 8”
B8 8125 Series will only have a single rate hardware kit. For these models install the single spring and then
install the lower spring hat.
ZINC
-
PLATED FINISH
B8 8125 Series feature a proprietary BILSTEIN zinc plated nish. This nish must be serviced in order to
maintain its luster. Particularly in moist climates, a protective coating, such as a wax or lubricating oil
should be periodically applied to prevent tarnishing. This nish is not covered under warranty.
HOW TO MEASURE YOUR SHOCK ABSORBER
2.0” Outer
Diameter
46mm Inner
Diameter
2.65” Outer Diameter
60mm Inner Diameter