Molded Medium Foam Insert for 1/10 On-Road Tyres - Yokomo YOKZR039M  [YOKZR039M]

This moulded medium foam insert is an accessory for 1/10 on-road tyres, crafted to support the tyre crown and enhance stability. Placed between the tyre and rim, it helps maintain an even profile through braking, cornering and acceleration on circuit or practice runs.

Compatibility and role: suitable for standard 1/10 on-road wheel and tyre assemblies, the insert is used as a tuning aid rather than a consumable race compound. Changing insert profiles or densities lets you tune contact patch and balance without swapping the rubber.

Installation notes: fit the insert into the tyre before mounting on the rim, align the moulded contours with the tyre crown and confirm even seating to prevent imbalance. Only trim where necessary to match the wheel bore and check the assembly on a short run.

Maintenance and lifespan: foam inserts degrade with use, particularly under increased loads. Replace inserts when they no longer maintain the tyre profile or when handling becomes variable.