Torque support adapters are required to anchor the Speedhub safely to the frame if the frame is not equipped with a Rohloff approved OEM dropout . Axle plates are to be used in conjunction with a support bolt or with the Rohloff Speedbone when a disc brake is in use. Speedbone adapter is secured to the outer side of the disc brake mounts (of International Standard IS 2000) and sits in the slot of an OEM2 axle plateItem Specifications: Description: PM-Bone, Post Mount Disc, Model Name: Speedhub,