Excess Center Lock ISO Adapter Description: The Excess Center Lock ISO Adapter threads on to a centerlock disc brake hub to provide the use of an ISO 6-bolt rotor. This is designed for the Excess XLC complete wheel range but can also be used on other centerlock hubs to be able to accept 6-bolt rotors. Specifications: Body material: Aluminum alloy Size: 52x52x9mm/2.05x2.05x0.35in Net weight: 27g Installation requirements: The center distance between the six-nail disc and the hole is 44mm Purpose: Install on the center lock hub so that it can install six-nail discs