Seido T47 Bottom Bracket

Premium T47 bottom bracket engineering for modern road and gravel bikes. The Seido T47 External Bottom Bracket is a precision-machined, high-quality threaded bottom bracket designed for T47 shell frames running 30mm spindle cranksets — delivering smooth, durable, and low-maintenance performance for riders who expect the best from every component on their bike.

The external cup design keeps the bearing assemblies accessible even when the bottom bracket is installed in the frame, making maintenance and bearing replacement quick and straightforward without removing the entire unit. Double-sealed cartridge bearings provide a first line of defence against dirt, grime, and moisture, with additional outer seals adding a second layer of protection for extended bearing life in all riding conditions.

Fits 30mm spindle cranksets with the included washers straight out of the box, and is also compatible with Seido's optional adaptor kits (sold separately) to accept other spindle standards — making it a versatile choice for current and future build flexibility.

Key Features:
- Precision-machined aluminium cups — T47 threaded shell standard
- External bearing design — accessible races for easy maintenance and replacement
- Double-sealed cartridge bearings with additional outer seals
- 30mm spindle compatibility — includes washers for direct fit
- Compatible with Seido T47 adaptor kits for other spindle standards (sold separately)
- Shell width: 68mm
- Shell ID: 46mm (T47 standard)
- Colour: Black
- Part Number: 100000223