An urban adventurer with real versatility The double: light rolling and quiet on tarmac, yet grips on tracks and gravel roads Robust rubber sidewalls make it impervious to damage even over rough ground Ideal for transforming an off road bike to a nippy city racer ETRTO size: 47-406 Size in other measurement standards (Inches/French): 20 x 1.75 Technology: Sport Bead: Skin REFLEX TPI: 3/180 Weight (g): 520 PSI: 50-65 PU: 10