This item is an RC-scale front lower A-arm spring intended for the Yokomo R12/GT family, optimised for carpet surfaces. It replaces the stock front lower spring in the R12/GT front suspension and is chosen to deliver a targeted spring characteristic for carpet racing.
The spring is listed as model R12-10S1 and fits R12/GT front lower A-arm assemblies as a direct replacement for the stock part. Installation is done by removing the front lower arm, swapping in the new spring, and reassembling the suspension to its factory geometry.
In practical tuning terms the R12-10S1 changes front compliance and affects initial turn-in on carpet layouts. Use it when experimenting with front-end balance for improved grip and steering precision, and assess changes through short, repeatable test runs.
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