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#1072098 - 09/25/21 10:16 PM Wheel offset and fitment question.  
Joined: Oct 2000
Posts: 1,444
johnz138 Offline
20+ Year
johnz138  Offline
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Joined: Oct 2000
Posts: 1,444
Sterling Heights, Mi
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.


1987 Monte Carlo SS, Lightning Rod equipped, engineless/2004-R,Holley carb, edelbrock intake, hooker headers, moog,Iceman crossmember, umi suspension, eibach springs,so much more,no computer/emissions.
http://www.cardomain.com/ride/2167110
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#1072100 - 09/26/21 01:15 AM Re: Wheel offset and fitment question. [Re: johnz138]  
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88ssBrent Offline
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88ssBrent  Offline
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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

#1072101 - 09/26/21 03:49 PM Re: Wheel offset and fitment question. [Re: johnz138]  
Joined: Oct 2000
Posts: 1,444
johnz138 Offline
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johnz138  Offline
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Joined: Oct 2000
Posts: 1,444
Sterling Heights, Mi
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.


1987 Monte Carlo SS, Lightning Rod equipped, engineless/2004-R,Holley carb, edelbrock intake, hooker headers, moog,Iceman crossmember, umi suspension, eibach springs,so much more,no computer/emissions.
http://www.cardomain.com/ride/2167110
wave
#1072103 - 09/27/21 01:59 AM Re: Wheel offset and fitment question. [Re: johnz138]  
Joined: May 2000
Posts: 1,850
BadSS Offline
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BadSS  Offline
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Joined: May 2000
Posts: 1,850
Pearl, MS, 39208
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).

#1072104 - 09/27/21 02:37 AM Re: Wheel offset and fitment question. [Re: johnz138]  
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mmc427ss Offline
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mmc427ss  Offline
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Pottstown, Pa
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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