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Pshhhhhht!
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Discussion Starter #1
I'm trying to get new wheels and tires from my GTO, but this and all the other boards are all over the place.

All I want to do is 18 X 8 in the front (245/45/18) and 18 X 9 (275/35/18) in the back. Would that combo work well? I read the offset's have to work right with the car. I heard 38mm will work for the front but not the back. Can someone help me out with what offset I need for the back wheels to get my combo right?

The bolt pattern on the wheels are 5 X 120mm and I DO NOT WANT TO ROLL OR CUT A FENDER. Thanks!
 

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Need A Little Beethoven?
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5,639 Posts
First of all, a 245/45/18 tire is most likely going to rub the strut, the size you want is 245/40/18. Second the offsets for the rear that will minimize the chances of it rubbing are in the 52mm to 58mm range, any less it will rub the fender, any more it will rub the wheel well. Alot of this depends on tire manufacturer, BFG's run wide, while Nittos run thin. There is no set combination for what will and will not rub, every car is different. Be prepared to roll your fenders or go for a smaller tire in the back.
 

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What the....
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2,590 Posts
Read the Sticky post at the top of the page. It will set you straight about tire size and offsets. I run the 245/35 x 8 and 275/35 x 9 on 19' wheels and they fit perfectly (with some modifications of course)
 

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Banned
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5,086 Posts
another option to avoid possibley rolling your fenders would be to get a good suspension setup for the rear so the back end dont sag on launch that should help minimize your problem..
 

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Premium Member
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13,113 Posts
Ok some information for you. OEM 17’s are 245/45/17 which equals 25.68” tall and 9.65” wide. To say in the same ball park with 18” rims you need a 245/40/18 which equals 25.72” tall and 9.65” wide. You stated 245/45/18 which would be too big like the other guys have pointed out.

I run 245/35/19's up front with 19x8.5 rims. Nothing touches up front. For the rear I'm using a 275/30/19 with a 19x10 rim. I have a small rub on the passenger side. It's been rubbing since December so it's not a big deal.

Not all cars are body to frame lined up perfectly but an 18x9 with a 265 tire will fit with no issue. Or use a skinny 275 tires like Toyo.
 
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