... tube ModelweightRubber contentPulling strengthTensile strengthAir valve3.00-8 300g15%~55%9Mpa-10Mpa380%-550%TR87 About ... size are available :Tyre and inner tube :2.25-17 ,2.50-17 ,2.75-17 ... ,2.50-18 ,3.00-18 ,3.25-18 ,2.50-14 ,2.75-18 , ... 4.00-12 ,4.00-8 ,3.00-10 , 3.50-8 ,3.25-16 , 2.75-21 , ... ,3.50-5,16x6.50-8 ,13x5.00-6 , 12 1/2 x 2 1/2 , 315x55 , ... 110/50-6.5 ,2.50-8 ,12 1/2 x 1.75 , 9 x 3.50-4 , 2.50- ...