Yokomo YOKZR039M - Foam Tire Insert Molded (Medium) for 1/10 On-Road  [YOKZR039M]

This molded medium foam insert is an RC-scale accessory intended for 1/10 on-road tyres, designed to support tyre shape and stabilise handling. It sits between the tyre and wheel to maintain a consistent profile under braking, cornering, and acceleration on track or during practice sessions.

Compatibility and role: the insert is for standard 1/10 on-road wheel and tyre assemblies, serving as a tuning item rather than a consumable performance part. Swapping inserts of different hardness or profiles lets you fine-tune contact patch behaviour and mid-corner balance without changing the tyre compound.

Installation notes: fit the insert into the tyre before mounting on the rim, ensure the molded contours align with the tyre crown, and check for even seating to avoid imbalance. Trim only as needed to match the wheel inner diameter, and inspect after initial runs to confirm the tyre holds its intended profile.

Maintenance and lifespan: foam inserts wear over time with regular track use, particularly under higher loads. Replace inserts when they no longer support the tyre profile or when handling becomes inconsistent.