I have a 15T front and I am ordering a 42 or 43 rear (heve not decided yet) But would I need to change the stock chain?

 

Nope.

 

Thanks for the reply I think i'm going with the 43. Anybody have that setup?

 

I just installed a 42t rear. With the pipe and power commander and 42t rear sprocket the throttle is very touchy - hit a bump...or dither the throttle.... and the bike lunges.

Can imagine having an even lower gear ratio - to me it would make city driving more difficult as any tweek of the throttle and the bike is jumping.

Best of luck.

 

Thanks for the response i'm gonna try the 42T and see if it's what i'm looking for. By what you say it sounds like it'll be just right. Thanks