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

This moulded medium foam insert is intended for 1/10 on-road tyres and provides structural support to the tyre profile. Installed between the tyre and rim, it reduces profile deformation so the car behaves more predictably under braking and cornering on the track.

Compatibility and role: the insert fits common 1/10 on-road wheel and tyre assemblies and acts as a setup option rather than a permanent consumable. Swapping insert types lets you fine-tune contact area and handling without changing tyre compounds.

Installation notes: insert the foam into the tyre before mounting on the rim, match the moulded contours to the tyre crown, and confirm even seating to avoid imbalance. Trim sparingly to match the wheel inner diameter and recheck balance after trimming.

Maintenance and lifespan: inserts will wear with repeated track use, more quickly under high loads or rough surfaces. Replace when they stop supporting the tyre profile or handling becomes unpredictable.