I agree with you that the front sprocket should have more than 15 teeth. I have tried 16 teeth, but I find 17 teeth to be proper for me. I think this is a matter of personal preference, and I like seeing the tachometer near 5000 while I am making my long rides.
I am not sure about the change in sprocket affecting the accuracy of the speedometer. Someone will probably pipe up and tell us whether your findings are accurate.
When a little change helps you enjoy your ride significantly more,
than it is a beneficial change, and not very small after all, eh?
(The "eh?" just slipped out. I am headed for Canada next week, eh.)
P.S. funny thing. You give your location as N W Indiana. Well, that would be near the Indiana-Michigan state line,
which is the very first state line that my Florida-based Wee-Strom rolled over. (Yawn, if you like; there is more.)
And the first ocean that I saw from its seat: Pacific. And the first place where it reached the Atlantic Ocean?
Last edited by Keith Falkner; 04-26-2014 at 01:14 PM.