Do NX5 rs250 rear sprockets(renthal) fit an mc28

also does anyone have any idea as to a good gear ratio for more top end ie i would like drop ratios so that 1st is like 2nd, 2nd is like 3rd etc..

mainly because i was at a trackday at eastern creek, australia and was maxed out 14,000 rpm halfway down the straight

NX5 sprockets do fit.

You'll probably want to start with a 40 rear and go down from there. Remember though that chain length will become an issue and you'll have to start chopping links out.

Std. gearbox and rear tyre:

12,500rpm 15/44 = 120mph
12,500rpm 15/40 = 132mph