|A road tire classic! The Grand Prix was the first clincher road bike tire to enter the world of road racing. Highly regarded for its long wear, high mileage, and puncture resistance. Casing is made of 3 fabric plies totaling 180 tpi with a Nylon double breaker.110-120 psi recommended pressure in all sizes. Black tread. Brown sidewalls. Wire bead. Specify size: 700x23 (ISO 23-622); 290g, 650x23 (ISO 23-571); 250g, 20x1-1/8" (ISO 28-406); 205g. or 26x1.0 (ISO 23-571) 258g.