Morn and light rim lock with CNC billet nut and spacer. Aluminium and steel rim locks are too heavy and can cause an imbalance in the wheel. Rim locks help to prevent the tyre from spinning on the rim. Trials, Enduro and Motocross tyres for example run fairly low pressures and heavy breaking or acceleration can spin the tyre on the rim and then it`s game over! If there is no factory fitted hole in the rim, this should be drilled opposite the tyre valve hole. Contents: 1 item.