well you cant run a 22x11x10 on a 9 inch rim. the first number (22)is the height of the tire or Diameter, the second (11)is the width of the tire, and the third (10) is the rim size, so you will need a 10" rim to fit that machine. I think the reason they make the rear rim smaller is to help with weight distribution of the machine the 10" diameter x 5" wide rim in the front comes out to be about the same weight as a rear rim that is 9" diameter by 8" wide. then you add a bigger tire to the back and it makes it a bit heavier if you start to get into bigger rims. you can match the rims if you like the look of them, i do all of my rims are 10" rims i just have some after market ones that are the size i wanted. rims range from 8" to 14" now so there is a wide variety, not all fit every machine though. the bolt pattern for the backs are 4/110 and the fronts a 4/144. 4 lugs 110 mm across the diagonal. good luck with your choice. steve