fearfactoryüberalles
Senior Retro Guru
- Feedback
- View
Had the same issue recently, and as I hate anything which is "threaded plastic" on my bikes I removed the cup (putting a big washer next to the inner (closer to the center of BB) lip of the cup and tapping it gently freed it), and replaced it with a steel one from the UN51-52-53 series (UN54 NDS cup is also plastic I think) which fits tightly and nicely.
DISCLAIMER: I did try UN55 alu cups and they are a loose, bad fit. I'm also not sure that any newly made plastic cup from Shimano budget BBs as UN26 and the likes, would fit, never did that. Earlier UN5x series can be had for cheap monies too, even a used/dead one will do as you only need the quite strong steel NDS cup which will (if not rusted/damaged) serve you for ages again for sure.
DISCLAIMER: I did try UN55 alu cups and they are a loose, bad fit. I'm also not sure that any newly made plastic cup from Shimano budget BBs as UN26 and the likes, would fit, never did that. Earlier UN5x series can be had for cheap monies too, even a used/dead one will do as you only need the quite strong steel NDS cup which will (if not rusted/damaged) serve you for ages again for sure.