How many teeth can you go up to (rear sprocket) before the chain starts rubbing on things?
I have a 2009 klx EFI UK model.
Thanks

 

I've run a 49T no issues. That and a 13 CS sprocket will climb mountains!

 

Thanks. So it passes the upper and lower chain guards OK?
CS?

 

I would say so, I am running a 14/48 combo with all stock chain guards in place. I also have a 13t and 15t I can swap out and run same chain, depending on needs. The 15t is almost like stock.

 

That was what I meant to do, but when I put on the 13/49 I cut the chain to fit it in haste to go on a dual sport ride... 15 needed a link or two extra... bummer!

 

I put a 50 (or maybe a 51) on one of mine & had to relocate the lower chain guide.... moved it forward a little

 

By the bye, for what it's worth. I checked this weekend and with my 14/48 gearing I am at 7k rpm at an indicated 60 mph (optimistic speedo) and 9k rpm at an indicated 70 mph.

 

Interesting. That should be similar to 12:42.
Will report back on 13:42 then 12:42.

 

13:42 6800rpm @ 60mph, 7800rpm @ 70mph.

Will report back on 12:42 when fitted.

 

Kinda fun to compare, I like to divide front number into rear. I'm probably wrong but I call it gear inches. 13/48 = 3.69, 14/48 = 3.43, 15/48 = 3.20.
12/42 = 3.5, 13/42 = 3.23, 14/42 = 3 (stock). And of course the spacing between each gear gets tighter as we go slower on final gearing.