k, did some figuring with piston speed. Formula is stroke in inches * RPM / 6.
my 1.95" stroke hits 1200fpm @ 3700 rpm.
Of course the question is how much power do I need in top gear at whatever speed 3700 rpm represents. Which would be 27mph with the new 17 tooth sprocket.
So I think I will try centering my shifts on 3700 rpm and see if that is tolerable anyway since I'm otherwise flying blind, and with the new sprocket and traffic allowing, I should be in 5th by 27mph. Just gonna have to take my time, not a problem
With a little "luck" my power demands will just be met at 27mph and I can just cruise there all day at uber peak efficiency
with both sprocket changes I hit 1200fps (3700rpm) at 30.5mph