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18x9 +30 wheel

This is a discussion on 18x9 +30 wheel within the Focus RS Wheels and Tires forums, part of the Focus RS Garage category; So I’m in the market for new wheel/tire package for a mix of AutoX, Time Attack, and track driving till I figure what I enjoy ...

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Thread: 18x9 +30 wheel

  1. #1
    RS Senior Member BlakeS's Avatar
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    18x9 +30 wheel

    So I’m in the market for new wheel/tire package for a mix of AutoX, Time Attack, and track driving till I figure what I enjoy the most in the RS. I found a 18x9 wheel I like but it has a 30mm offset and it seems most everything else I’ve seen has a 35 to 40mm offset. I will most likely be running a 255-35-18 RE71R on these wheels. For those with a similar setup but 5-10mm less offset do you have the room at the fender on stock suspension? If I rolled the fenders would I have enough room? Any advice would be appreciated.

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    I'm no expert but have been going through a lot of old threads recently for fitment of 18x9.5s
    People are claiming to run 265/35/18 et38 with no rubbing on stock suspension on 9.5s, et30 on a 9" only going to poke another mm or two VS the 9.5 et38, and with the 255 VS 265 I think you'd be OK on stock suspension without rolling, but maybe someone else can chime in here.
    You be poking though

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    I am on stock suspension, 18x8 ET25 with 235/40s. They poke and you certianly will with 255s. I don't rub, but if you were to lower the car you most certainly would without adding more camber.

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    Don't do it man. Buy wheels that fit...

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    I run 18x8.5 et35 and 18x8.75 et35 both with 255/35r18, no rub on whiteline springs (including autocross). I think 18x9 et30 would be pushing it honestly
    tedsRS likes this.

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    RS Senior Member BlakeS's Avatar
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    Quote Originally Posted by 320icar View Post
    I run 18x8.5 et35 and 18x8.75 et35 both with 255/35r18, no rub on whiteline springs (including autocross). I think 18x9 et30 would be pushing it honestly
    How much room do you have to the fender? I'm thinking it would fit but when running hard I'm concerned about rub with out adding more camber. I dont plan on changing up the suspension this summer either.

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    Lol guy, they will be an inch out of the fenders.

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    This wheel fitment thing is beaten to death and there's a new thread on it everyday. I autistically tried to help a number of other posters if you want to review my post history.

    Here's all u gotta do..

    Go outside with a metric ruler or tape measure and measure the distance to the fender lip from the face of the wheel rim. Then use any online wheel size calculator. I like willtheyfit.com

    Every car is going to have an ideal offset, the center most point between the fender and the strut. On our cars it's somewhere between +40 and +45. Wheel size doesn't matter, it's tire width combined with offset. Yes, our options are limited. But you can definitely fit a 255 on an 8.5. look at the fifteen52 wheels designed for our cars. 8.5 +42. A 9J in this offset would be nice, but would likely still require at least 2 degrees of camber. Consider the inside of the fender is not flat, it's a radius. This means that even if a tire fits at the lip, any suspension compression will have the tire edge hitting inside the fender.
    Last edited by tedsRS; 05-09-2019 at 10:09 PM.
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    there are actually 2 benefits to a wider wheel though,

    1. you can stretch a larger tire, you want some stretch to preload the sidewall for best handling
    2. by stretching the tire onto a wider wheel, you change the shoulder shape of the tire, increasing your clearance to the inside of the fender.

    dont be this guy.... i learned the hard way. i have made these 9 +35's fit, with lots of camber. going to try some 255/35's maybe down the road. currently on 235/40 and the pictures here are 255/40. the stance picture is after adding extreme camber, i was maxed out in the rear at -5 and still rubbed even though the tire tucked inside the fender lip.

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    and heres where im at now. 235/40 and -3~. also much higher.
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    R3d Baron and BlakeS like this.

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    If you're going to be tracking the car, buy wheels that fit and are light. Titan7s and Enkeis tend to be the ones people gravitate to the most for track duty.

    Why waste the extra money making a +30 fit when you can spend it on seat time instead?
    BlakeS likes this.

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