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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

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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.

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  • 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
    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
    Apr 24, 2020 at 18:00

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