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I've tried putting spacers on the BB
Surely you want a negative spacer, if the binding is the DS crank pressing on the DS bearing then pushing the bearings further apart will only make it worse.
Measure the BB shell to make sure it's not a bit wide, if it is then facing a bit off will solve the above issue. The other things which can go wrong are the BB shell faces not being parallel, again facing will fix this, or the thread not being coaxial, which is much harder to fix.
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gbj_tester
I've swapped a Quarq crankset, with GXP BB, over from one bike to another and for some reason it's binding when I tighten up the nds crank. I've tried putting spacers on the BB, but that's not helping. Any other ideas as to why it might be happening?