Re: Sprocket change

Posted by woodsrider250-2 on
URL: http://vintage-and-classic-hondas.81.s1.nabble.com/Sprocket-change-tp457274p457277.html

'in general' 1 in the front is like 3 in the back....So it's nearly a wash (1tooth change).  Proven by the math.  17/42=.40  18/46=.39 so you're looking at a .01 taller final drive.  I'd GUESS that the chain should be fine if you decide to switch.  Now 18/42 would net a .42 which would be a .03 difference.  I'm once again guessing (more involved math here involving tire dia/speed/etc), but each .01 probably nets 2-300 RPM change at 60mph.