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