I have a BB386EVO frame shell and a FSA PF BB30 fitted into it. All good with this

Now, I have a Praxis Works M30 crankset that I want to use but I haven't been able to install. The axle seems too long with only the bearing cover and washer. I have tried a FSA BB386-30 adaptors but it do not seem to work... Not sure if I am missing something?

Any advice will be much appreciated

  • Do you mean Praxis? What BB standard are the new cranks for? Commented Mar 23, 2020 at 12:05
  • Yes, sorry, I mean Praxis Works. ... And that is the problem, I don't really know, crank axle is 30mm dia. and has 28mm ending on the non-driver side. It is an older model of this one praxiscycles.com/product/alba-m30
    – JoseDel
    Commented Mar 23, 2020 at 22:12
  • I'd measure the part of the spindle that sits in the BB and compare against a list of BB standards bikeradar.com/advice/buyers-guides/… Commented Mar 23, 2020 at 22:16

1 Answer 1


Looking at the Praxis web site it looks like M30 is a proprietary BB and you need a specific Praxis M30 to BB386 adapter.

Strange that you tried PF30 BB units in a BB386, but I think maybe the cups and bearings are the same. According to https://www.bikeradar.com/advice/buyers-guides/the-complete-guide-to-bottom-bracket-standards/ they both use 6806 bearings and a frame shell diameter of 46mm.

  • I think now that I have is 386EVO BB that has the same 6806 bearings (I was wrong). However I reckon now that the BB and the cranks are not compatible. the reason is that the M30 has a 28mm dia. end on the non-driver side. (see wheelsmfg.com/crankset-tech) making it non suitable for the the current 30mm bearing. mmmmmm puzzled and sad :(
    – JoseDel
    Commented Mar 25, 2020 at 20:38
  • Just to add a bit of clarity: many cranks have axles that are uniformly 30mm in diameter. Praxis cranks have axles that are 30mm, tapering to 28mm on one side. Thus the need for a proprietary BB.
    – Weiwen Ng
    Commented Apr 24, 2020 at 18:00

Your Answer

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

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