ZERO POINT SHAFT was developed to maximize the performance of wheel bearings. The wheel of the motorcycle is supported from the frame only at the wheel bearing and the axle shaft. Parts called bearing are made with very high precision, but general axle shafts are not precise products corresponding to that.Originally, bearings can't demonstrate their original performance unless they are in a state where appropriate pressure (pressurization) is applied. ZERO POINT SHAFT thoroughly pursues machining accuracy,reviews the dimensional design and sets the clearance between the axle shaft and the bearing to the optimum value.