Actually it dosen't as the 2013 has quite a bit higher top speed. At 50 m.p.h. the 2015 is 4-500 r.p.m. higher. Reason I am asking is my friend would like to duplicate the 2015 clutching if that is the difference. A lot less chance of frying a belt in high range with the lower gearing.
I have a 2015 900 Ranger and a friend has a 2013. Same tires exactly- 28" Mega Mayhems. My 2015 revs quite a bit higher at the same speed. Was there a reduction in gearing? He needs to go in low range a lot and I easily stay in high because I am reving higher.
Just put a set of 28" Mega Mayhems on my new 900 Ranger. I think they are a tougher tire than the Zilla for heavier machines. Seem to have great traction!