Standard tubes hold air considerably longer due to the purity of the rubber compound and the uniform wall thickness.Item Specifications: ISO Diameter: 507 / 24" BMX, ISO Width (mm): 38, ISO Width (mm): 39, ISO Width (mm): 40, ISO Width (mm): 41, ISO Width (mm): 42, ISO Width (mm): 43, ISO Width (mm): 44, ISO Width (mm): 45, ISO Width (mm): 46, ISO Width (mm): 47, ISO Width (mm): 48, ISO Width (mm): 49, ISO Width (mm): 50, ISO Width (mm): 51, ISO Width (mm): 52, ISO Width (mm): 53, ISO Width (mm): 54, ISO Width (mm): 55, ISO Width (mm): 56, ISO Width (mm): 57, ISO Width (mm): 58, ISO Width (mm): 59, ISO Width (mm): 60, ISO Width (mm): 61, ISO Width (mm): 62, ISO Width (mm): 63, Labeled Size: 24 x 1.5-2, Shaft Type: Threaded, Tube Compound: Butyl, Valve: Schrader, Valve Core: Removable,