Touring bike build: chainline
I am building up a touring bike from a Velo Sport Alpin frame (very much like the one is this thread
I have a 7 speed freewheel and a Sugino XD triple crank. The rear spacing is 126mm and the chainline (middle sprocket) is 42.5mm. Sugino recommends a 113mm (or larger) spindle length; this give me a front chainline (middle chainring) of 47.5mm. Does anyone think the chainline being off by 5mm is going to be a problem?
I don't have much choice in the back, but I could try to see if the crank will mount on a smaller spindle as there is plenty of frame clearance. Right now I have a Shimano UN54 113mm that I could exchange for a 110mm or 108mm, but there may not be enough room as the Shimano bottom brackets seem to have a spacer or stop installed (see attached image). I assume the crank is not supposed to be touching this?
If anyone has any thoughts, advice, or comments I would like to hear them.