The Yokomo R12-18FSP front shock spring is intended for 1/12 scale R12-type front suspensions and is supplied as a single piece to modify front roll and rebound response on compatible cars.
Fitment is simple for those experienced with R12 dampers: detach the shock, open the cap and shaft assembly as needed, install the spring onto the shock cup or retainer, then close up the damper using your original shock oil and preload measurements. Make sure seals and bearings are clean to prevent binding during reassembly.
Setup guidance: use this spring to tune front-end balance, focusing on one variable at a time and combining spring swaps with matched oil and preload adjustments to dial in handling reliably.
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