BB86 vs BSA
Quick verdict
BB86 (press-fit, 41mm bore, 86.5mm wide, press-fit cups) and BSA (threaded, 34.8mm shell, 1.37" × 24 TPI thread) are different frame standards and are not interchangeable. Buy the bottom bracket that matches your frame, then match its spindle to your crank.
| BB86 | BSA | |
|---|---|---|
| Full name | BB86 Press-Fit (Road) | BSA / English Threaded |
| Fitment | press-fit | threaded |
| Shell | 41mm bore, 86.5mm wide, press-fit cups | 34.8mm shell, 1.37" × 24 TPI thread |
| Also known as | BB86, Press Fit 86, PF41 road, 86.5 | BSC, English, ISO, 1.37" x 24 TPI |
| Frames listed | 34 | 234 |
| Bottom brackets listed | 34 | 68 |
| Guide | BB86 compatibility → | BSA compatibility → |
Frequently Asked Questions
Can I fit a BSA bottom bracket in a BB86 frame?
No. BB86 (41mm bore, 86.5mm wide, press-fit cups) and BSA (34.8mm shell, 1.37" × 24 TPI thread) are different frame interfaces, so a BSA bottom bracket will not fit a BB86 frame. You need a bottom bracket built for your frame's standard.
What is the difference between BB86 and BSA?
BB86 is press-fit (41mm bore, 86.5mm wide, press-fit cups); BSA is threaded (34.8mm shell, 1.37" × 24 TPI thread). The biggest practical difference is that one threads into the frame and the other presses in — threaded shells are typically more serviceable and less creak-prone.
Check your exact combination
Frame standard, bottom bracket and crank spindle all have to line up. Drop your parts into a build and our engine verifies the whole bottom-bracket chain for you.
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