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This inner tube is made from brand new isobutylene isoprene rubber, which is better than natural rubber in air tightness, elastic damping and aging resistance. 2.50-10 inner tube is typically used on full size street legal scooters and bikes, as well as used on a variety of 49cc, 50cc, and 70cc mini dirt bikes and pit bike models, like Baja Dirt Runner 49, Honda CRF50, and Motovox MVX70. This inner tube can be used as a replacement for Razor Dirt Rocket MX500 or MX650 (rear tire ONLY), Razor SX500(rear and front). Heavy duty inner tube fits 10" tires from 2.5 to 2.75 wide, such as Honda XR50 CRF50, Yamaha Pw50, Suzuki DRZ70 JR50, KTM 50 Mini/SR Adventure, Chinese dirt bikes and mini choppers. Perfectly fits for dirt bike tires size 2.50/2.75-10, may fits on tire size: 3.10-10, 70/100-10, 80/90-10, 80/100-10. Inner tube is manufactured by QIND under ISO/TS16949 certification.