CushCore 29" Plus Tyre Insert SetCushCore 29" Plus Tyre Insert Set All the performance benefits of the PRO, but optimized for plus sized tyres and wider rims. HOW IT WORKS Not all tyre inserts are created the same. CushCore is no ordinary tyre insert and is based on a new concept, tyre suspension. Any suspension system has a spring and a damper, and with CushCore, pressurised air in the tyre is the spring and the CushCore tyre insert is the damper. Like traditional suspension, a