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      08-05-2017, 10:20 PM   #1
N55xS54
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Custom built wheel spec question

Since we do not have many options for 1 piece wheels I want to get some made. Going with Forgestar M14. 18x8.5 front 18x9.5 for the rear. My question is this..... what is the "BEST" offset for both front and rear? 225/40 front tires, 255/35 rears..... Car is lowered on Cobb springs (same as Eibach Sport).... I want to avoid running spacers and want the best fitment without any rubbing issues. I do not want to roll my fenders. Thanks

Here is the wheel! Not sure on color combo yet

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      08-06-2017, 12:31 PM   #2
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I'd definitely go with et42 up front. Rear is more complex. With a 9.5inch wheel, you could go really high before you'd run into the inner fender, like et62. But for best looks was far as how they stick out vs the front, et48 or so should be about right. If you want to play it safer, you could go a tad higher. Also, I'd try to find out what rear et might effect how concave the wheel will appear.
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      08-06-2017, 03:58 PM   #3
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FWIW, Apex wheels are 18x8.5 ET45 & 18x9.5 ET58 and that is a proven setup...

BBS USA have recently added RI-A wheels on their website, which were previously only available in Japan I think. On the Japan website, they have a 1er-specific setup - 18x8 ET45 & 18x9 ET50. They are forged one-piece monoblocks. Most likely not cheap but I don't know how much your custom Forgestars would cost. http://bbs-japan.co.jp/en/products/1135/ http://www.bbs-usa.com/race_wheels/w....cfm?wheel=116
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      08-08-2017, 08:18 AM   #4
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ET43 Front. ET53 Rear. That will allow you to easily run a chunky 255 with street alignment, or even 265s. There's no need for higher offsets.
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      10-16-2017, 10:31 PM   #5
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Quote:
Originally Posted by John_01 View Post
ET43 Front. ET53 Rear. That will allow you to easily run a chunky 255 with street alignment, or even 265s. There's no need for higher offsets.
What about 18x8.5 et35 and 18x9.5 et40 I don't want run negative camber but I will roll or shave the fenders if i have to
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      10-16-2017, 11:26 PM   #6
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Quote:
Originally Posted by 07tundra View Post
What about 18x8.5 et35 and 18x9.5 et40 I don't want run negative camber but I will roll or shave the fenders if i have to
Probably you would be better off with ET45 to ET50 on the rear. It depends on the tire (A LOT). With proper wide sporty tires I suggest that around ET50 is what you ideally want for the rear fitment. Especially since you say you want to keep stock alignment.

Possibly you can make lower offsets work if you are into custom fitments, but unlikely to be as fully functional as having the correct offset that is intended for the car.
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      10-19-2017, 02:02 PM   #7
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+1 for ET58 being perfect for the rear for a 9.5" wheel. Apex made this offset specifically for our cars, you can fit a 275 on there without any issues, no way you can do that with ET40 (I couldn't even fit a 255 without rubbing on my rolled/trimmed/slightly pulled rear fenders!)
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      10-23-2017, 09:07 PM   #8
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yeah but what about wheel gap that looks disgusting
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      10-23-2017, 11:47 PM   #9
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The stock wheels are only 8.5" wide. Going to a 9.5" rear wheel will help the appearance, even if the offset remains similar.
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