Originally Posted by
Road Fan
Before you go too far, measure all the clearances to teh frame: crankarm to chainstay, chainring closest point to chainstay, chainring bolts to chainstay, anything else that could represent a limiting condition or a source of metal-metal interference. Recognize that you can't move that crank closer than those gaps you measure. Just know the limitations.
But I agree with Danno: put it together, see how it works, measure the clearances and see what the next one to try should be.
Thanks. I've measured as much as I can without the BB, and I think I'll start out by trying the 115mm. With my current crank, I'm at a 42mm chainline with the ring on the inside, and clear the chainstay very well. So I'm hopeful that with a 47mm chainline and the ring on the outside, metal hitting metal won't be an issue, even if I decide on a larger chainring.