Part no. ETRTO Dimension Type g PSI 0150449 23-622 700 x 23C Clincher 245 110-125 0150457 25-622 700 x 25C Clincher 265 95-125 0150466 28-622 700 x 28C Clincher 290 80-115 PureGrip Compound is derived from an activated Silica compound and is a good example of how we integrate customer feedback continuously into our research and development. This mixture technology fits in perfectly alongside the BlackChili Compound. The name PureGrip does exactly what it says; exceptionally good grip and durability are the distinguishing features of this compound. Engineered with PureGrip in our Performance products in our road and mountain bike ranges