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All the mega exo break quickly have found. Replaced two today alone. If its 24mm ht2 standard chainset then you can use a ht2 road bb and will work without spacers on the fsa crank. Fit without chain and as you come up to torque spec on the single bolt, just keep spinning it between efforts, see that it still spins freely and without a big increase in drag. I tend to grease the inside of bb thread so the bolt goes in nice, and also give chainset a sideways tap with mallet to make sure it's not got any side to side movements. Also check removal cap is tight, replaced so bloody many gx caps (think they are now sold out till 2024 as so many have fallen off worldwide)
BrickMan-
Thanks. I've bought a Shimano BB for it. I normally torque stuff in steps so will try and remember to spin between each though not had issues before. No idea if it has spacers on it currently but is there a reason not to use them with the Shimano rather than FSA? Are they different widths or something? Always grease threads. I don't tap the cranks I don't think but I do tend to retighten after a ride or two just to be safe.
hippy
https://www.lfgss.com/comments/16598743/
P2M gravel cranks currently in a MegaExo BB. Could I replace with a Shimano BB or do they differ some how?
ie.
https://www.youtube.com/watch?v=KYNLQkIlzJQ
EDIT: "Due to customer demand the set was developed for the Shimano Hollowtech II buttom bracket standard"
No idea why it has a MegaExo then. I guess it was the only thing in stock when I got the cranks.