sprocket?

hi chaps wanted to ask the experts i have an rsvr 03 old shape was looking to change to either 15 tooth or 16 tooth on front what would you recommend and how much would this effect the top end speed by doing this want to keep the original 42 tooth on the back thanks for any advice.

Hi all, Thanks for all your advice on the rad covers, i'm gonna go for the black ones. My question today is: I want to improve the gearing on my 2008 tuono R as it seems a lil long, i was going to go down 1 tooth on the front sprocket but i have been told to go up 2 teeth on the...