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@TM
So, got a new bottom bracket, a cartridge bearing centaur one. It's the perfect width, but when I have it so the cranks pass the chain stays equally on either side there is a gap between the cup (terminology?) and the frame of about 1mm on the drive side.
Can you get threaded spacers or something to fill this gap? old school BB lockring looked perfect but wouldn't thread on... I wasn't sure if it would be ok as it was but after about 150 miles it has developed a creak, I'm going to remove, clean, loctite and replace it and see if that works for now.
Any wisdom much appreciated thanks!