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Wheel offset and fitment question.

Posted By: johnz138

Wheel offset and fitment question. - 09/25/21 10:16 PM

Looking at some 18x8 wheels, 4 inch backspace, 5X120.65 and says zero offset. This offset shouldn't be an issue correct?

Also with that I shouldnt have any rubbing issues using a 255 tire? Or stick with a 235 (i believe) in front and 255 in rear?
Thanks.
Posted By: 88ssBrent

Re: Wheel offset and fitment question. - 09/26/21 01:15 AM

Type in your current wheel and tire setup and what you want to go with and it will show you the difference.

https://www.rimsntires.com/specspro.jsp
Posted By: johnz138

Re: Wheel offset and fitment question. - 09/26/21 03:49 PM

Thats a great site. Doesnt really tell me much about offset. The 18x8 wheel with 4" backspace will fit, but will zero offset matter? I dont think it will, but wanna be sure before clickin the order button.
Posted By: BadSS

Re: Wheel offset and fitment question. - 09/27/21 01:59 AM

Zero off-set on an 8" rim would be 4.5" backspacing. 4" backspacing on an 8" rim would be -12mm. So, either they have the backspacing or the offset wrong.

Stock off-set is -6 (7" rim with 3.75" backspacing). If you use that measurement with the stock 215/65/15 in the calculator posted along with either measurements above with the tire size you want to run it will tell you how much the wheel tire combo would move in (0 offset) or out (-12 offset).
Posted By: mmc427ss

Re: Wheel offset and fitment question. - 09/27/21 02:37 AM

Pay attention to how wheel width, offset and backspacing relate to each other. Offset and backspacing are measured using the outside measurement of a wheel, not the bead flange. An 8" alum wheel will generally be 9" outside, + or - a 1/16" or so. A zero offset 8" wheel would measure 4 1/2" backspacing.
When choosing wheels it necessary to sometimes do the math yourself to know exactly what the wheels measurements are.
Bob
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