The Kogel T47 Internal Bottom Bracket fits with an 85.5 or 86.5mm shell. Featuring ceramic bearings, this bottom bracket is made to run like new for years on end while enhancing your power transfer. This version is designed to accommodate 24mm spindle cranksets from Shimano, Rotor, and SRAM GXP. To install your bottom bracket, you will need an Enduro TorqTite-compatible tool. These road seals are designed for low weight and efficiency on road rides. Kogel knows that every pedal stroke is important, and hand makes their bottom brackets to maximize your efficiency.