The CeramicSpeed Bottom Bracket is a reliable and efficient way to keep your pedaling fast and smooth. This inboard version is made for T47 86mm frame shells which are often found on Trek road bikes. It connects to your Shimano crankset or other crank with a 24mm spindle. It features coated bearings, leading to the longest lasting friction-free performance. The CeramicSpeed Bottom Bracket is a simple and reliable choice for riders to feel great as they pedal.