If you are chasing a replacement brake rotor Lock Ring for Shimano Centrelock Hubs then this is what you need. Fits all 15/20mm Thru-Axles and screws onto all Shimano Centerlock front hubs.
These are a 16 notch with a 44mm OD. The require a specific lock ring tool to correctly install.
This model replaces the older SM-HB20 Lock Ring





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