? Continental lightweight tubes have a lower thickness and so it is imperative that inflation pressures are maintained to prevent the risk of pinch flats. FEATURES: Seamless and mold cured construction Removable valve core Presta and Schrader valves are threaded full length Presta and Schrader have removable valve cores SPECS: Labeled Size: 700 x 18-25 ISO Width (mm): 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 ISO Diameter: 622 / Road / 29" Shaft Type: Threaded Valve: Presta Long 56-74mm Valve Core: Removable Weight: 80