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 — no more guessing between BSA, T47 and press-fit.
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