Bottom Bracket Replacement

The bottom bracket parts of a bicycle is an essential component of the drive train and crank system, it connects the crankset halves to the bicycle with a series of bearings and spindles (axel) allowing the crankset to rotate freely. The spindle which connects to the cranks can either be integral to the bicycle bottom brackets or integral to the cranks halves. The spindle splips through the internal race of the bearings that allow the spindle and the cranks to rotate.

The bottom bracket parts are inserted into the Bicycle bottom brackets shell of the bicycle frame, this “shell” is the common connection point of the seat tube, down tube and chain stays.

Bottom brackets replacement pieces come in various types and sizes consisting of both thread/bore diameters and shell width.

We offer the following brands: ABI, Acros, American Classic, Campagnolo, Deda Elementi, FSA, Fulcrum, Gusset, Hope, MRP, Phil Wood, Race Face, Shimano, Sugino and Truvativ.

If you don't see what you are after, drop us an email, we only show a fraction of our products on our website and are continually adding more.

Most common sizes follows:

British I.S.O. = 1.370” X 24 tpi or 1.375” X 24 tpi, in both standard shell width of 68mm and oversized of 73mm.

ISIS Overdrive = 48 X 1.5mm with shell widths of 68mm or 100mm.

Italian = 36mm X 24tpi with shell width of 70mm.

French – 35mm X 1mm (25.4 tpi) with shell width of 68 mm (obsolete – used only on older French bicycles).

Swiss = 35mm X 1mm (25.4 tpi) with shell width of 68mm (same as French, but fixed cup is left threaded for reliability).

Raliegh = 1 3/8” X 26 tpi in shell sizes 71mm and 76mm (older British made Raliegh’s)

O.P.C. Ashtabula = male threads on cranks 24 tpi (most) 28 mm (Schwinn & Mongoose) with 68mm (2 3/8”) wide, 51.3mm (2.02”) I.D. Primarily used in older U.S bikes, BMX, juvenile bikes and department store bikes.

tpi = threads per inch