... rubber inner tube 1,Model size :400-8 2,Natural rubber 3,Valve: TR13 4,Weight ... natural rubber or butyl) Valve:TR13 350-6,350-7,300-8,350-8,400-6, 400-8,400-10,400-12, 500-10, ... 500-12, 450-8...... Valve:TR87 200*50 , ... -4, 300-4 ,350-4, 300-8,350-8,300-10 ,400-8…… Valve:TR4 225-14,225-16,225- ... 275-19,300-12,300-18,300-17,350-8,350-10,325-16,410-18,275-21, ...