For 1/10 touring car racers using medium narrow 24mm tyres, the Yokomo ZR-039MA Medium Mold Inner aims to sharpen tyre contact with the track. Its thin profile creates a deliberate gap inside the tyre to boost grip and refine handling balance.
The ZR-039MA helps tyres keep a steadier contact patch during quick direction changes, which aids mid-corner stability and gives smoother weight transfer under braking and acceleration.
This insert is a match for common YD2 variants including MRTC-YD2 and MRTC-YD2CK, allowing easy installation for drivers wanting a focused handling tweak.
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