Shimano Ultegra Bottom Bracket

This bottom bracket is designed specifically for frames with an 86.5mm shell width, commonly referred to as the BB86 standard. Before purchasing, verify that your frame is designed for a press-fit system rather than a threaded one.

This component is compatible with any road crankset that uses a 24mm Hollowtech II spindle interface. It is a direct fit for Shimano Ultegra cranksets and most other Shimano road models.

Yes, because this is a press-fit component, you will need a dedicated press-fit bottom bracket installation tool to seat the bearings into the frame correctly. Using a hammer or makeshift tools can damage the bearings or your frame.

Press-fit bottom brackets are pressed directly into the frame shell, which eliminates the need for external threaded cups. This design allows for a wider bottom bracket shell, which can increase frame stiffness and reduce overall weight.

These are high-quality sealed cartridge bearings, which are designed to be maintenance-free. They are not intended to be opened or serviced; if they begin to feel rough or develop play, the standard procedure is to replace the entire unit.