255/45/17 tires on a 17x8's (sedan)--offset?

[vq35de]

What offset do y'all think I will need to run on a sedan to fit 255/45's on 17x8 wheels? I am thinking around a +32-35 mm will work

Stock wheels are 17x7 with a +45 offset. 215/55/17 stock tires

I have only taken a cursory look at the suspension and it appears that I shouldn't have any rubbing as long as I stick the wheel out 1/2 inch farther than what it is.

Anyone running this combo?

[PalmerWMD]

vq:

I'll take this to our suspension/tire/wheel forum for better response.

Fred...

[Gary@Tirerack]

Looks like you may need to modify the front fenders to fit those in the front.

[Exar-Kun]

thats a bit large, isnt it? both height wise and width wise... a 235-50-17 would be much closer to stock, and provide plenty of contact patch...and would help fender rubbing problems(if they were to be encountered).

a 35mm offset should be about right....-chet

[vq35de]

255/45/17 are within 0.1 inch of the diameter of 235/50's. yes, i would be sticking out by 30 mm further than stock. No, I don't think it would contact the fenders unless I lowered it on stock suspension which I don't plan to do. 235/50's run just a little bit inside the fender well so i would be 5 mm or so outside the fender well horizontally

Maybe 215/55 in front and 255/45 in the rear for track days only?

[vq35de]

bump

[Grant@tirerack]

A 215 isn't going to work on an 8 wide rim. It's too wide. The 235 sounds like the better fit.

[szh]

What offset do y'all think I will need to run on a sedan to fit 255/45's on 17x8 wheels? I am thinking around a +32-35 mm will work

Stock wheels are 17x7 with a +45 offset. 215/55/17 stock tires

32-35 mm would work, I would think. Because the standard G35 coupe wheels are 17x7.5 with 30mm offset in front, and 17x8 with 33mm offset in rear. I forget the stock tire sizes though ...

Z

[vq35de]

A 215 isn't going to work on an 8 wide rim. It's too wide. The 235 sounds like the better fit.

Grant, The question was regarding 255/45's not the stock 215's.

Besides your website says the recommended rim width from the manufacturer is 8-9.5" so from what I read they will fit on the rim.

Whether or not the rims will fit on the car is what I am inquiring about.

Sean

[Grant@tirerack]

Sorry, my typo. I meant 255 not 215. While it is within the range of 8-9.5", its on the bottom of the range and would not be a good fit from a handling standpoint. The sidewalls would have to pull in so far to meet the bead area of the rim that you would get a lot of roll in corners. The 235 is a better fit for the rim. As for the fit on the car, we have never test fit anything that wide here. It looks like a lot of guys have been running that setup in the 35mm offset range without issues but it depends on your setup on the suspension. You'll have to test fit it on the car to be sure. Check with the wheel maker to see what sizes they have test fit with that wheel on that type of car. They are the only ones who will be able to give you a thumbs up or thumbs down on the wheel fit.

[AZhitman]

I'd be inclined to disagree, but I am certainly no tire expert. 255's on an 8" rim are a nice balance, especially for a larger car like the Q. Dennis praises this setup continually.

I have 255's on a 7" rim - REALLY pushing the envelope, but I've had no ill experiences and the handling is superb. But I'd prefer to be running an 8" rim with that much tire.

[Grant@tirerack]

The main issue is the rim width vs. the actual tire width. On this tire size you would be looking at at least a 9" wide tread width and about 10-10.5" section width on the tire sidewalls. The cross section of that tire would be very triangular and the sidewalls will flex a lot more than they would on a wider rim. The wide contact patch will stick to the pavement but as the forces start to transfer from the wheel to the tire sidewall it will flex and roll more under the strain. With a wider rim, the sidewalls will have more support and will work better to transfer that energy to the ground. It's hard to describe without illustrations but that's it in a nutshell.

[Q45tech]

True ideally one wants a wheel width equal to the tread width or just 0.5" narrower [wheel].........from a vector force analysis.

Can't just focus on Section width as differing brands in the same Section width have different tread widths.Wheels should be purchased to match/fit the chosen tire not the other way around..........but who but international racers could afford this.

Remember Nascar still uses 15" x 9.5" wheels with 300/55/15 tires on a 3400 pound car.

[Exar-Kun]

but...nascar sucks.:p-chet

[vq35de]

but they can go 200 mph I still have a governor at 155 mph.

they don't suck that much.

Y'all if I could put 15's on this car I would have a set of nice mickey thompsons for the strip by now.

[sixxdeuce]

Hey, q45 tech. I just looked up the info, my 245/40/17's have a tread width of 8.5" and are mounted on a 8" wide wheel, so this falls under "ideal fitment"? They look, feel and perform great but some people still think they are a little too wide.