... 3.00-18 3,strong tear strength 4,good air-tightness 5,long mileages Description of goods: ... Butyl motorcycle inner tubesize:3.00-181,own brand:WINHUA2,rubber content:18 ... %-35%3,OEM accepted4,samples available5,ISO9001 INMETRO SONCAP,CIQ...we have Natural rubber and butyl rubber inner tube of ... tire,trucks tyre and so on.sizes of Motorcycle inner tube are as below: ...