Hi there - I’ve just bought a set of Redline cranks off Ebay (second hand but the seller said he’d bought them NOS and only had them on his show bike...). Anyway one of the bottom bracket cups is a bit notchy, almost as if there’s some grit in the sealed bearings. I’ve never messed with bottom brackets like this before (only could afford cheap rubbish BITD) and would appreciate any advice on whether this is normal or if there’s an easy remedy.
Cheers
GP