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I think the general consensus is to have loose ball bearing bb's very slightly loose. Maybe you are over tightening the lockring? It takes me about 4/5 goes to get it the way I want it.
Tbh since getting a sealed bearing hope ti bb on one of my bikes I wouldn't go back to loose unless it was "period correct".
Anyone got any tips for a SG75 bottom bracket install? I'm really struggling to get it 'just right' it's either slightly too tight - getting tighter over time, or too loose, where eventually I can feel some play between the bearings and spindle! It's really doing my nut in!
Considering calling it quits and getting a sealed cartridge bb if I can find an ISO one in the right size.