Join Date: Apr 2009
Location: New Rochelle, NY
Bikes: too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter
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Let's assume it is 116mm, so the issue is do you go up or down 1mm.
Usually I tell people to look at the chainstay clearance on the right side and see how much room they have. Consider 2mm a minimum safe distance leaving some room if a chainring bends slightly. Then if you have spare room you can go shorter, otherwise longer.
Since you're crank is off already, you can toss a coin. 1mm isn't much so odds favor going shorter will be OK. Or you can play it safe and go 2mm longer. Remember, that not all are symmetrical, nor do cranks go up the same distance on the tapers, so the actual difference may be more or less than the difference in the spindle length.
An ounce of diagnosis is worth a pound of cure.
“Never argue with an idiot. He will only bring you down to his level and beat you with experience.”, George Carlin
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