i am selling my 18's w/ scorpions and putting the stock 17's back on...i dont have the sport and imo my X rides noticeably better and smoother with the stick 17's than the sport 18's - and my suspension keeps getting screwed up and taking a beating - several mechanics ive spoken too said if i plan on keeping the truck to put the 17's back the suspension is taking a beating (prob bc the way i drive) bc i dont have the sport suspension so the truck isnt made for the sport size wheels/tires....i used to have 20's and that probly contributed to destroying the suspension and ride of my X