I put the 26" mudrunners on my Xplorer and did lose some top end speed and a bit of manuverability.(which is to be expected) They are amazing tires though! I went though some quick-sand like mud in 2wd and crawled right through...my buddies SP500 with stock tires did not make it though... R.I.P.

You won't be dissapointed with them...no matter what size you get.