fab5fiddy

yer right on the money xidium. pretty bright for a young buck.

Z50NATIONALS

you gotta figure in wheel size to i think
i havent done those calculations
in a long time
z50 8
xr's r 10's
kx is 17or 18's
dirttrackin we use 19's

Z50NATIONALS

just found this
17 tooth countershaft sproket
with a 26 tooth rear sproket
now put that on your stock fiddy and see how fast itll go
if itll pull it
http://www.hondaminitrail.com/z50.html
look down in the performance section about 1/4 way down the page

Xidium

Every full mx bike except a 500 has a 19 inch rear. I was using my bike because I look at lots of stuff for it. I can see were you get that 1 tooth front equals so many rear, but it changes with gearing.
If you look at this ratio chart you will see that it changed with size.
(thsi was suposto be a pic but it didnt work) http://members.tripod.com/sidecase/s...tor/ratios.jpg
As you go farther down and stay left it is close to 6 differance. Up and left it is 3. Up and right it is 2. And down and right it is 3. It does chage It guess, but not by the final ratio (f/r). And thanks Fab5. I read alot of your stuff and pick up on it.

Z50NATIONALS

yeah me to fab

crazeinc

I don't think you can fit a 17 tooth front sprocket on at least a Z50. The chain is very close to rubbing the case on the top with a 16 tooth countersprocket.

weedracer

a 16 is as big as you can go on a xr