I just recently acquired a second rear wheel to use for on road. I was very happy with stock 14/42 for road, and like 13/42 off road, but wouldn't mind going slightly lower.

My question is; is it possible to get the equivalent of these ratios from the rear sprockets only and use the same chain? Or will I have to switch back and forth? Idea's?

 

Try this app-you should be able to get the answers you need. Gearing Commander: Motorcycle Speed, RPM, Chain & Sprockets Calculator

 

My street setup is 14/43 and dirt is 14/45. I think the dirt is perfect for my riding style

 

All you have to do is divide the rear sprocket tooth count by the front sprocket tooth count to find the ratio for the 13/42, then multiply it by the front tooth count you want, in this case 14 to find the closest sprocket tooth count. Round by rule of 1/2 or decide if you want to have a shade higher or shade lower gearing when picking.

42/13=3.23 (rounded for print, not rounded in next calculation for increased accuracy... like it makes some huge difference... just did it, that's all)

3.23*14=45.23 Use the 14/45.

So there's the "math" to know what to do.

You could consider going to a 15T countershaft sprocket if you are near enough to buying a new rear sprocket. Bigger wears better, less chain wrap and load distributed over more teeth.

 

That's not much of a change, only .4%.


if you went with a 13 front the change would be 7.1%.

 

So now with a 42/45 rear combo, that is 3 teeth difference.
Since the chain only sits on 1/2 the sprocket, the total rear wheel difference would be 1.5 teeth.
Look at your rear wheel chain adj, can you move it forward 13/16" (1.5x5/8"pitch)?

 

This may help.
https://www.kawasakiforums.com/forum...-length-42553/

 

The 07's have a snail type adjuster. But the 14 tooth sat about the 4 mark. Think there is 8 numbers.
Thanks for the math, that will help. But I also don't know what will fit the rear before I have to edit the chain guide. I would like the lowest gearing possible to use the same chain and front sprocket for both.

 

Don't forget to take the tire sizes into account, street rubber being smaller.

 

I run a 47 rear sprocket with either a 13(extreme offroad), 14(good dual sport ratio), or 15 front(good on the highway) all on the same chain.