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Thanks. I think I’ve actually just found what the problem is. The type of bearing used in the Race Face bb might not be the most appropriate, so I might just switch them to a higher quality SKF or Fag bearing. Not the cheapest bearings in the world but cheaper than a new BB and ought to solve the problem. Only issue might be the clearances getting the new bearings in because of the very thin outer race.
Jonny69
They're compatible with standard Shimano Hollowtech II BBs, so a BBR60 would be my first choice.