1

I have a road bike with a press fit bottom bracket (I'm not quite sure which kind). The guides I have watched make it seem fairly risky to replace and requires ~$250 worth of tools to replace. I saw online there seems to be some products that can convert a press fit bottom bracket to a threaded one.

Do these work? Are they worth using?

2
  • Probably you can get away with that but why whould you when you can swap out the bearing?
    – dmb
    Mar 1, 2019 at 19:18
  • Possible yes , but have disadvantages. Praxis & wheels mfg are expensive and need dedicated tools. FSA is a one way journey. How often do you change your BB? IMO changing a pressfit BB is only scary the first time you do it. You can also buy decent extractor/press tools on eBay for not much. Mar 1, 2019 at 23:05

1 Answer 1

3

BB30 and PF30 have press-in adapters available that have ISO aka BSA aka English threads. They do work but they mostly exist for the purpose of being able to run a certain crank that you wouldn't otherwise be able to, and to a lesser extent to address creak. (I don't have a very refined opinion on how good they are at doing the latter).

BB86/92 and conceptually similar pressed standards (BB90, 95, others) are by nature too wide for this sort of approach to work.

You can make a very effective bearing press for all types of press-in bottom brackets out of threaded rod and some nuts and washers. If you got the right diameter rod to interface snugly with the bushings in the Park BBT-30.4 or 90.3 (for example), you could just get those and skip buying a shop-type press, and you'd have lost nothing but a little bit of speed. (Improvising tools to do the whole job for cheap is kind of a larger discussion and I'm tempted to write more, but it's probably off-topic for this question.)

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge that you have read and understand our privacy policy and code of conduct.

Not the answer you're looking for? Browse other questions tagged or ask your own question.