The OTK sprocket hub 50mm is a magnesium finished product using two separate bolts to allow even clamping of the sprocket hub to the axle.
It comes in two options:
- Standard version where both the hub clamping bolts and the sprocket mounting face are on the same side of the hub and face outwards towards the wheel.
- Rotax version where the hub clamping bolts and the sprocket mounting face are on opposite sides of the hub and the hub clamping bolts face inwards towards the bearing.