The Yokomo B9-SSP240A Progressive Shock Spring is a purpose made component for the BD9 chassis. Produced in cooperation with AXON, it features an unequal pitch that gives a progressive spring rate between 2.40 and 2.70, suited to large-bore short shock assemblies.
Progressive springs offer increasing resistance during compression so small bumps are absorbed while heavier loads are supported. This improves predictability through corners and helps drivers find consistent balance. The B9-SSP240A introduces that progressive behaviour into your setup choices.
This spring fits a range of Yokomo cars including MRTC-BD10FF, MSR-BDFWD and MRTC-BD919. Choose it when you need a broader tuning window for short shock setups or when aiming to stabilise mid-travel responses.
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