The Shimano MT400 Centre Lock Mount 32 Hole FreeHub is an excellent value center Lock disc-compatible rear hub for 142/148mm fitment. The Center Lock disc rotor fitting is ideal for Shimano hydraulic or mechanical disc brake systems. Shimano MT400 Centre Lock Mount 32 Hole FreeHub Features Rubber contact seals help prevent rust-causing water and mud reaching hub bearings 8- and 9-speed compatible Available in 32 hole drillings, 12x142mm / Boost 12x148mm