Bottom Bracket Compatibility Chart
Bottom bracket standards are the most confusing part of bike compatibility. This chart lays out every standard we track (its shell size, whether it's threaded or press-fit, and which frames and cranks fit), so you can find the right bottom bracket for your frame.
8 standards, checked against our compatibility engine.
| Standard | Fitment | Shell | Native crank | Also known as |
|---|---|---|---|---|
| BSA | threaded | 34.8mm shell, 1.37" × 24 TPI thread | 24mm | BSC, English, ISO |
| T47 | threaded | 47mm shell, M47 × 1mm thread | 30mm | T47 internal, T47 external, T47a |
| Italian | threaded | 36mm shell, 36mm × 24 TPI thread | 24mm | ITA, 36 x 24, Italian thread |
| PF30 | press-fit | 46mm bore, press-fit nylon/alloy cups | 30mm | Press Fit 30, PF30 |
| BB86 | press-fit | 41mm bore, 86.5mm wide, press-fit cups | 24mm | BB86, Press Fit 86, PF41 road |
| BB92 | press-fit | 41mm bore, 92mm (89.5mm road) wide, press-fit cups | 24mm | BB92, Press Fit 92, PF41 MTB |
| BB386EVO | press-fit | 46mm bore, 86.5mm wide, press-fit cups | 30mm | BB386 EVO, 386 EVO, BB386 |
| BBright | press-fit | 46mm bore, 79mm asymmetric (11mm wider on the non-drive side) | 30mm | BB Right, BBright Press Fit, BBright Direct Fit |
Threaded standards
Cups thread into the frame: the most serviceable, creak-resistant option.
Press-fit standards
Bearings press into the frame bore: lighter and larger-bore, but tolerance-sensitive.
Head-to-head comparisons
Which bottom bracket fits my frame?
Start a build with your frame and crankset and our engine tells you exactly which bottom bracket standard and spindle you need, with no more guessing between BSA, T47 and press-fit.
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