Specialized Aethos/Tarmac SL8 Disc Brake Adapter Description: Designed to match the lightweight philosophy of the Aethos and Tarmac SL8. Specialized constructed the Disc Brake Adapter out of aluminum and hollowed out the center, saving every gram possible. Note: This adapter is only compatible with the Aethos and Tarmac SL8 fork. Specifications: Material: Aluminum Brake Caliper Mount Type: Flat Mount Position: Front Rotor Size: 160mm Weight: 9g OEM replacement part on the following bikes: Aethos Tarmac SL8