Yokomo S4-300RSA Rear Suspension 1mm Shim  [S4-300RSA]

Small Shim, Big Setup Impact with Yokomo S4-300RSA

The Yokomo S4-300RSA Aluminum Rear Suspension Mount Spacer is intended for RC drivers who want to micro-adjust the rear geometry on YZ-4S and compatible cars. This 1mm spacer offers a controlled tuning step to help achieve more predictable rear-end behaviour. Constructed from aluminum, it is both lightweight and resilient for regular track use.

Adjust Balance and Stability

Although designed for the YZ-4S, the spacer will also fit chassis including B-YZ4SF, B-YZ4SF2-1, MOR-010 and MOR-020. The slight change from a 1mm spacer can influence traction distribution and roll characteristics, handy when chasing a specific handling setup. It helps create clearer feedback from the rear end when cornering hard.

Quick Fit and Robust Construction

Fitting the spacer is quick and uses the standard rear mount fasteners, so minimal disassembly is needed. Its cross-chassis compatibility means it is a useful upgrade for racers with multiple cars. The aluminium finish resists wear, ensuring trustworthy setup shifts across sessions.