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You can feel the bearings with your fingers if you take the cranks off. Do they roll smooth or grainy?
Is it new or old? You can smack them in and out but there's a risk you'll damage the sleeve or the bearings, only do it if you have spares at hand.
Netakure-
I have to take the cranks off to change the PM battery soon anyway so I'm waiting as long as possible then I'll get to check the bearings. I may have a spare but I need to check first.
They're Cannondale cranks in a Spesh Shiv so I presume they're pretty standard BB30 bearings but who knows with stupid bikes."OSBB is a narrower version of PressFit 30, sharing the same inner diameter of 46mm, but reducing the shell width to 61 versus the PF30 road standard of 68mm."
hippy
I'm pretty sure it's the bearings but the bearings or the bearing fit to the frame - that's the bit I'm not sure about and I don't have spare bearing to replace with.