Shimano Ecrou Centerlock SM-RT81 Black

Shimano SM-RT81 Hydraulic Centerlock Disc Brake Locknut - Black Unique and essential, this Shimano part allows you to lock a disc onto a hydraulically braked rim. It is compatible with a centerlock type clamping and is delivered with the appropriate washer. This nut is fixed with a specific centerlock splined tool such as a Shimano compatible cassette remover tool.