Size:70028C Weight:354g Tire Pressure:80-116psi. Model:Grand Sport Race. Why choose this tire. Race: Performance in tours and competitions. This all-rounder is ready for every challenge, even the biggest ones. 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. Is based on the technology of our SafetySystem ­puncture protection. Made of nylon fibre and similar to Kevlar, it reliably protects against punctures and cuts. It also has particularly low rolling resistance and reduced weight, perfect for our performance range of road tires.