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@EvilDMP
I have a bike with a Shimano bottom bracket fitted; its label says:
It's just about OK on the bike, but the chainwheels (a Sunrace R90 Road Double Chainwheel - 50/34T FCR96) are further out than is ideal. They could easily come in 5-8 mm. So, I'd like to find a bottom bracket that fits better.
What specifications should I be looking for?