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The length of the BB is dependent on the cranks: two different cranks can achieve the same chainline, with different length BB.
You need to break out the internet to find what size BB is recommended as OE.
You'll then want to bring the cranks in a little to sit the chain in the middle of the cassette (assuming you use the outer ring position).
Scilly.Suffolk
jontea
Quick question for the technically minded among us. Running 1x10 on a surly pacer, 68mm bsa, ring on outer of a road double with q factor of 156mm, I have a un55 in the shed, axle is 113mm, too long?