Continental's tough Grand Prix 4-Season is even tougher with the addition of the Vectran anti-puncture breaker. The ultimate combination of speed, low weight, and all-weather performance, combined with excellent puncture and sidewall protection. Black casing with added DuraSkin sidewall reinforcement for protection against cuts and abrasion. The Vectran breaker wards off flats but is also supple for less rolling resistance and greater comfort than other puncture resistant barriers. Kevlar beaded folding tire. 430 TPI. Max inflation pressure 120/120/115 psi for 700c x 23/25/28mm size tires (622 ISO). Weight is 220/230/250 grams.