Tamiya 5005032 Rear Coil Spring 58174/118 for F101/102 Chassis  [5005032]

Replacement spring for F101/102 rear shocks

This coil spring is an RC-scale spare designed for the rear suspension of F1-style Tamiya chassis that accept the F101/102 mounting arrangement. It is marked internally as 58174/118 and lets you change rear spring rate without modifying the shock body.

Use the spring to replace fatigued or broken rear springs or to adjust the rear grip and roll characteristics. Installation generally involves removing the rear shock, swapping the spring, and refitting the original cap and retainer; standard hand tools are normally sufficient. Check fitment against your F101/102 Group C rear shock fittings before driving.

For setup work, combine spring swaps with incremental changes to shock oil viscosity, spring preload, and mount position to reach the desired handling balance. Keep a log of each change to reproduce effective setups for varying surfaces.