Many today’s production bikes, deliver over 200 HP. This is more or less the point where an aluminium sprocket is on the limit of his mechanical characteristics. Premature wear results in power loss and as a result the material fatigue can cause cracks. In Racing configuration, the lifetime of a steel sprocket will be clearly superior to an aluminum sprocket as the stresses are less important. It is obvious that a steel sprocket will be slightly heavier than an aluminum sprocket, since the density of steel is 2.8 times higher. The design makes this steel sprocket as light as possible. Example: 36808-43 Alu: 0,246 Kg, 35808RLK-43 Steel superlight: 0,593 Kg