well the time has come to change only 2 of my 4 tires but i have the opportunity to change the fronts and make them smaller maybe. i wanted to know what is the exact difference between going from a 255/40/17 and going down to a 245 or even 235/40/17. is this possible and will this make a huge difference. or should i just stay with 255/40/17 all around. the tires i am going to be staying with are the toyo proxes t1-s. i know they have all those sizes but i aint certain of which way to go. thanks everyone for any help u can provide.