JMP tire holder - Rubberized body - Orange anodized nut - Specially shaped and anodised washer - Rim width: 2.15 inches - Tires: 4.00 / 4.25 In off-road racing, low tire pressures are used to improve traction on difficult surfaces. The low tire pressures often lead to a slipping tire and torn off valves. The JMP tire holders prevent this from slipping .