2010-2012 PRO-RIDE RUSH Switchback RMK Service Manual, Page 333Get this manual
Steering and Suspensions RMK COIL-OVER REAR SUSPENSION
Suspension Adjustments
The primary tuning component on all RMK coil-over rear suspensions is the rear track shock spring installed lengthAll RMK coil-over rear suspensions are manufactured with STANDARD rear track shock springs that will accommodate rider weights (with gear) up to 340 lbs(154kg)Initially, the rear track shock spring should be set to the rider's weight (with gear)Reference the Rear Track Shock Spring (RTSS) Setup Table below
RTSS Setup-Standard Spring (Measure spring length with suspension off the ground
RIDER WEIGHT
(WITH GEAR) LBS160 KG 73
INSTALLED SPRING LENGTH
(REAR SUSPENSION OFF THE GROUND) INCHES CM 27.3 27.6 26 26.3 26 25.7 25.4 24.8 24.1