Like it says, I want to fit 225's for the traction, cornering, and because i think a little more offset will look pretty good on this car. So what offset is required to fit 225/45/18's without rubbing?
Depends on the width of the rim too, as the profile of the tire changes slightly depending on the rim width. Stock offset is 55mm, so any rim with 55mm OS would be guaranteed not to rub with 225/45s, whether using a 7", 7.5" or 8" wide rim. However, in general, something close to 50mm would be fine too. RX8 wheels are a good choice. Some people are running 235/40s on the RX8 rims without rubbing, while others have experienced some rubbing with the same size tire but of a different brand.Like it says, I want to fit 225's for the traction, cornering, and because i think a little more offset will look pretty good on this car. So what offset is required to fit 225/45/18's without rubbing?
Offset is the distance the actual mounting surface of the wheel is from the virtual centerline of the wheel. 0 (zero) offset would be where the mounting surface of the wheel is in the exact same plane as the centerline. This means that there are equal amounts of wheel width to the inside and to the outside of where the wheel mounts to the hub.so a 18x7.5 in a 48 offset with 225/45/18's would or would not rub, I never figured out the offset crap in my head so forgive my ignorance....
Hey BigBen, I would really recommend rolling the rear fender lips. It's not that much work, and there seem to be a few websites that have a process to rent and ship the tool. Then you can run a decent size tire as the car rightfully needs and deserves.Bummer, so 225's in the rear are the issue, but of course 215/45/18 on a 48 offset would clear easily... 215's seem so wimpy after having 225's on my 160 HP ford probe GT... and this is so much more car!
I agree that 40 series assures clearence, but looks bad on cars that aren't dropped. If you dont have plans to drop you car, IMHO avoid the 40s, the gap looks rediculous.Why don't you just run a 225/40? The size is slightly off but not enough to make a big difference...
W/ a 18x7.5 -48 offset you should be able to run w/out a fender roll.
That is the exact setup I have and I am very close but not rubbing!
Ya that is true! You can live w/ it, but it looks 100times better w/ a drop...I agree that 40 series assures clearence, but looks bad on cars that aren't dropped. If you dont have plans to drop you car, IMHO avoid the 40s, the gap looks rediculous.
Like I said, you 'should' be ok... As other people have said it's almost a hit or miss thing...That would work, I didnt want a smaller overall diameter but if it fits and gets me 225's....
Side wall 3.8
Side wall 3.5
Speedo would be off 2.1% slow
Side wall 4
Speedo would be off 1.4% fast
O guess 225/40/18, if you guys dont think they will rub on a 48 offset, are my choice!
Yup, that was me. I thought it would be clear of rubbing for sure but I lowered my car with Autoexe LD's and the 225/45/18's w/ +48 offset made the rear seats useless with two adults and and ice chest in the trunk. Major rubbing on the inside of the wheel well while shifting from 1st to 2nd gear from a standing stop.People are running into problems with the rear passenger tire rubbing on the inside of the fender when running a 225/45/18. It is very close on my car with that set up and a 48 offset. One speed6 owner had to switch to 215's not because of the fender lip, but the bulge in the wheel well for the jack. Seems, like nothing is for sure on this issue.