I'm a rookie when it comes to wheel fitment with or w/our rolled fenders and stuff. Sometime this spring or summer I'm hopefully going to get new wheels and tires and need some assistance. For those of you in the UMW with 18" wheels on front and rear how do they fit? Reason being is the wheels I'm getting are 18X9.5 with a 30mm offset. I have plans to get the fenders rolled pretty heftily for this, but my main concern is everyday rubbing. Its not my daily driver anymore.

 

9.5 +30 all around?

One thing this will do is limit you to 255/35, or 265/35 series tires or wider. Look at tire racks site, check the specs for the tire model you think you are going to use, and see the recommended fitting for 18 x 9.5 inch rims. The tire rack site is good because you can also look at a tires revolutions per mile. You will need to keep this number very close to stock, if you don't want to change the effective gearing of the car. Additionally, a taller tire will be harder to fit, especially in the front.

Then find a good wheel/tire offset calculator. There was one I used to use but they now require a subscription to use it. Anyway, you should be able to find one for free online. Compare your new wheel/tire sizes and offset against stock numbers. This will tell you how much further out the new setup will be. Better calculators will also give you how much closer to the suspension the wheel/tire will be. This might be important in the front, the rear won't be a problem with suspension.

However, doing basic calculations in my head;
Front: a 255 tire vs 215 stock, and a +30 vs +55 offset, equals a tire/rim that is 45 mm further out than stock (1/2 the extra tire with, all the offset), or about 1.8 inches
Rear: assume a 265 tire vs 245, and a +30 vs +63 offset, equals 43mm further out. About 1.7 inches

Go out to you car and look at those measurements. Likely, this will be very difficult to fit with just a roll. You will probably have to also pull the fenders. More likely you will need new wide body fenders, or an overfender style body kit.

A big variable here is how much you are lowered, obviously lower makes this all difficult to fit. I also have not considered extreme camber angles, which would make it fit easier, but wear tires, and look odd.

As a example, I have Advan RZ's in 17 x 8.5 +45 offset rims with 225 series tires on the front of my car. I am lowered on PSS9's, not very low, and have -1.7* of negative camber. I am mostly rub free, except over large bumps. The rears are 17 x 9 +45 with 255's -1.9* camber, and are rub free.

SOAPBOX ALERT
My opinion, is that our cars look best, and fit best, a +50 offset rim. This brings tires right out to flush, without having to go to extremes with camber/rolling/etc. A +50 with a 225 tire on the front is about perfect. A +50 with a 255 on the back works great too. Good luck, however, finding a +50 rim that looks good. I searched low and high, and I don't think they exist

You might go into the gallery section, and look thru the "hella flush wheel" thread. You will find all kinds of aggressive fitments, over fenders, etc in there.

Good luck and enjoy the search

 

Thanks for the info. I found a guy with the exact wheels im looking to get on this forum and runs that fitment i was referring to..I will talk to him and see what he did and how they fit...

 

i dont have 18x9 but i do have 17x9 with 255 front ad rear my fenders are rolled and it seem to ride out pretty smooth... since it is a daily driver im always driving roads im not common with but my tire doesnt rub really unless the bump is terrible

 

I think your sizing is about spot on, with the exception of the good looking rims. My setup:

F: 18x8 +50 225/35/18 1.5deg camber
R: 18x9.5 +55 255/30/18 2deg camber


Attachment 200726

I think it looks pretty good

 

I agree, the wheels that I want are only +30 offset.

 

I love the BBS in grey on white, on other colors not so much.

 

+30 is actually MORE offset. The wheels/tires will be 20mm further out than the above pics

 

Actually, the front will be greater than 20mm.

He is looking at a 9.5" width up front compared to my 8".

1.5in*25.4mm/in = 38.1mm
38.1mm/2 = 19.05mm

So in addition to the 20mm difference in offset, the additional width of the wheel will push it out another 19.05mm. So you are looking at your front wheels sticking out 39.05mm or 1.537" further out than what I am running. BTW, this setup rubs very slightly up front on the fender liner. I do not have my fenders rolled front or rear, or rear bumper tab relocated.

You may be able to pull it off with a full roll, skinny tires and a lot of camber. In my opinion, unless you are dead set on getting that set of wheels, I would probably try to find something with a better offset for our cars.

 

Actually, the front will be greater than 20mm.

He is looking at a 9.5" width up front compared to my 8".

1.5in*25.4mm/in = 38.1mm
38.1mm/2 = 19.05mm

So in addition to the 20mm difference in offset, the additional width of the wheel will push it out another 19.05mm. So you are looking at your front wheels sticking out 39.05mm or 1.537" further out than what I am running. BTW, this setup rubs very slightly up front on the fender liner. I do not have my fenders rolled front or rear, or rear bumper tab relocated.

You may be able to pull it off with a full roll, skinny tires and a lot of camber. In my opinion, unless you are dead set on getting that set of wheels, I would probably try to find something with a better offset for our cars.
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Yes, clearly I missed the wheel width difference in my quick response.

However, I do agree with you that 9.5 +30 will be very difficult to fit, especially up front, without over fenders, or wide body fenders.

I am surprised you are rubbing. I always figured that if I could just find +50's I'd be fine, cause I get very little rub. I figured another 5mm would fix it all. Perhaps you are lower than me, and maybe I have slightly more camber. Or could be car to car variance.