The Yokomo B9-SSP240A Progressive Shock Spring is designed specifically for the BD9 platform. Developed alongside AXON, its unequal pitch coil produces a progressive rate from 2.40 to 2.70 so it reacts differently through light and heavy compression cycles.
Because progressive springs increase resistance as they compress, they give softer initial travel for traction and greater support later in the stroke. That mix helps drivers control weight transfer and maintain balance through corners. The B9-SSP240A delivers that variable response for detailed setup work.
Fits several Yokomo models such as MRTC-BD10FF, MSR-BDFWD and MRTC-BD919 among others. It is useful both for targeted race tuning and for general upgrades where a wider spring rate window is desired.
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