Sunrace cartridge bottom bracket. Cottered and tapered fittings.

Sunrace make a range of cartridge bottom brackets which fit unusual frames and allow use of cottered cranks with a cartridge bottom bracket. A good option for replacing the bottom bracket on bikes which otherwise would become unusable.

All bottom brackets are 68 mm wide. The inside diameter of the bottom bracket shell is as shown in the options. See also the standard Shimano bottom bracket.

Cottered bottom brackets have a length of 136 mm, cotterless are 127 mm.

The BSA thread is the standard 1.37 inch diameter, 24 tpi - by far the most common threading for threaded bottom brackets.

If you require a 40 mm bottom bracket, please also consider the complete cranksets for this size.