The Trackmark is S&M's race specific tyre, built for speed and grip. It's designed with a lightweight folding kevlar bead, a lightweight and strong high TPI casing to get you up to speed quickly and hold tight in fast turns. The centre tread of the Trackmark is broken to increase acceleration, braking traction and to further reduce weight. It's a smooth, fast tyre designed for todays hard packed and paved tracks. Max pressure rating: 110psi. ###section### Product Specs WHEEL SIZE: 20 or 24" MAX PRESSURE: 110 PSI WEIGHT: 2.1" - 538g (19oz) PACK SIZE: Single Colour: Black; Size: 2.1", 1.95", 1.75"