The Tamiya 53156 Hard Inner Sponge OP-156 is a purpose-built insert for 1/10 on-road tyres that reduces sidewall flex and helps the tyre retain its intended profile under load. It is favoured where predictable tyre behaviour is a priority.
By limiting tyre deformation, this hard inner promotes a steadier contact patch and more repeatable cornering. That benefit is useful for club racing and anyone chasing consistent lap times.
Suitable for a wide selection of 1/10 on-road tyre types, the sponge installs with basic care and common tools. Allow a little time for fitting and check alignment once the tyres are mounted to ensure even contact.
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