are both same width of chain line and chainstay? and British 68 wide shells and cable runs similar..
[a bike with over the bb cable run has a FD bottom contact with a 50t ring, but not a 52.]
Same British standard BB, same cable routing. Brand new frame has not yet been built up. Width of chain line? Will be using same standard 10-speed Shimano cassette. So if I understand you correctly, the only thing that could throw me off is if the new chainstay is significantly wider or more radically curved outward than the old? Which could be a problem if the chainwheels get too close to the chainstays? The new chainstays appear to be about 2mm wider than the old. I think I'm OK. Thanks.