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It is generally known that 0 degrees of camber is not a preferred setting. Most riders will want inward (negative)
of at least 4-8 degrees. This will give good cornering traction with free steering feel. More camber angle may be
required as track conditions dictate.
Caster
Caster is the angle to which the steering pivot axis is tilted forward or rearward from vertical. Positive caster is
tilted rearward toward the rider while negative caster is tilted forward away from the rider. The Caster is factory
set at approximant. 20 positive degrees and is not adjustable. Positive caster tends to straighten the wheel when
the unit is moving forward. Reducing the caster angle toward 0 will reduce the steering effort on the rider but
reduce the high speed stability of the steering. Caster adjustments should be performed by knowledgeable chassis
tuners.
Steering Toe
Toe settings affect three major areas of performance: Tire Wear, Straight-Line Stability and Corner Entry Handling.
Toe should be set at minimum of ¼” with the shorter measurement at the front of the tire. Less toe angle will
cause the unit to not respond to steering inputs from the rider. At ¼” this will give good steering feel and good
max speed stability of the unit.
Shock Preload
The shock preload should never be set above what is required to hold the spring in place on the shock.
Shock Valve
The Pro MX units are supplied with Gas charged shocks. If additional valving requirements are needed, contact an
Apex certified shock service center.
Warning:
Due to the high pressure nitrogen charge, do not attempt to open the shock.
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