butyl Inner Tube Size: 650R16,750R16,825R16,825R20,900R20,1000R20,1100R20,1200R20,1200R24 Inner Tube1.Size: 650R16,750R16,825R16,825R20,900R20,1000R20,1100R20,1200R20,1200R24.2.The butyl inner tubes are with good capability of keeping gas. 3.The butyl inner tubes are with good capabilities of heat preventing, ageing preventing and avulsion preventing when running with high speed.4.Certificate: ...