Pierre
dunno anything about maths mate, but I reckon you wouldn't much notice the up "1 tooth" mod. I did this mod on the Fazer and the R1 and had to go up 2 teeth in order to notice the difference. Oh and ya want a Renthal sprocket, others just don't last as well in my personal experience. :yo:
Didn't think I'd notice the minor loss of top end 'till I had the R1 pinned at Snetterton at an indicated 165 and was being overtaken by Gixer thous :B