For model racers chasing a finer rear balance, the XRAY 368275 Progressive Rear Spring Set fits big bore shocks and delivers a variable spring rate suited to cornering loads. The design helps the car hook in early and resist roll later in the corner.
These progressive springs are softer at first to increase contact patch and traction, then stiffen as the chassis rolls to maintain stability at speed. That graduated response helps drivers keep the throttle earlier without upsetting balance.
XRAY measures and pairs each spring to ensure equal length and damping feel, so you get consistent performance left to right and can replicate setups run after run.
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