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@TooTallTim
Right, I've measured my current BB at 107mm. The clearance problem getting a shorter one is actually the centre of the crank arm, which is about 3mm away from touching the BB shell now.
If I got a Sugino 103mm BB, is it risky running that close to the BB shell? If my measurements are even slightly out it's gonna scrape, or not tighten properly.
Does this mean getting some lower profile cranks as well?