... 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 ...