what is the widdest tire i can put on a 9" wheels and widdest tire i can put on a 8.5" wheel?

 

depends on what we're talking about exactly. if your taking about a 15x9, you can put something along the lines of a 28x12.5(roughly a 325/50/15) and make it tuck under the car with some inner fender "massaging" and rolling the fender lip, but with say like a 17x9, your not going to get much more than a 275/40/17 on it because of the way the sidewall is and so there isn't as much give like in the big sidewall tires.

 

there are some 03 cobra guys running 315s on a 17x9 wheel but i DO NOT reccomend it. mostly because its a waste of money. a 315 on a 9 inch wheel actually has LESS contact patch than a 275 does.

 

Why is that?

Just curious...I have 17x9s with 275/40-17s myself

 

The shape of the tire. 275s are going to have straight walls and a nice flat patch. 315s will bubble out cuz they are wider than the rim is recomended for. So the bubble will loose contact. Stick with what you got unless you get wider rims.

Just as a testimony, I have 11" rims and 335s I am going to lower it down to 315s. The tire looks healthy and planted when it is the right size. The 335s bubble out more than I would like.

 

what modifications do i need to do to run a 18x10 wheel in the rear?

 

i am getting 285/40/17 for mine. should fit nicely no problem...remember some manufactures tires are different from one to the other!

 

i want to get ROH drift r and i dont know which wheel size i should get for the rear? 18x9 or 18x10 i dont want the tires to stick out the fenders and i dont want to do any modifactions to the fenders. thats why i want 18x9 but i want to put a tire thats wider than 275? which one should i get?

 

i decided to go with 18x8 in the front and 18x9 in the rear so now i need what is the biggest tire i can put on a 18x9 wheel?