yet another wheel offset question - Pontiac Solstice Forum
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post #1 of 13 (permalink) Old 07-24-2019, 02:10 PM Thread Starter
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yet another wheel offset question

I need new wheels for one of my cars.
The winters have just destroyed one set of chrome wheels.

SO, I am looking at 156C SURGE Wheels ( more details on - https://www.carid.com/raceline-wheel...361327453.html )
as these look like stock.



But I discovered that the stock/OEM wheel has an offset of +55
while this wheel has an offset of +35.

I'm confused, and do not understand this 'offset' term.

What is the 'offset' really mean to me ?
What does +35 vs +55 mean to me ?

I really want a stock looking wheel at a reasonable price.

All the wheels that I previously liked ( 2007-2010 days ) are no longer made.

Please help me understand...
thanks

Sir William's Fleet
Mean 2007 NA 2007 Solstice ordered on 8/24/06 - Picked up on 12/12/06 - Totaled on 6/12/10
Mean 2008 GXP Acquired 6/21/10 with 1275 miles on it - Summer Solstice !
Deep 2009 NA Coupe Acquired 11/2/13 with 1040 miles on it
Mean 2009 GXP Coupe Acquired 8/27/16 with 9100 miles on it
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post #2 of 13 (permalink) Old 07-24-2019, 02:37 PM
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Here is a pretty simple graphic that should explain it: https://www.speedwaymotors.com/the-t...kspacing/30059

So that wheel will be 20mm outboard of stock.
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Last edited by JohnWR; 07-24-2019 at 02:41 PM.
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post #3 of 13 (permalink) Old 07-24-2019, 04:22 PM
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I've spent hours trying to figure out fitment for aftermarket wheels.

I finally understand most of it. In Sirwm's case, his wheels would "stick out" a bit farther than the OEMs.

These websites might help in figuring out just what "offset" actually means:

https://www.1010tires.com/Tools/Wheel-Offset-Calculator
https://www.willtheyfit.com/

BTW, pay close attention to the center hub size of new wheels. One may have to purchase "hubcentric rings" to make up the difference.

What I'm still having trouble with is "backspace." Does anyone know what the backspace is for our OEM wheels? And what that actually means when comparing other wheels?

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post #4 of 13 (permalink) Old 07-24-2019, 04:49 PM
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Sirwm i just had a set of new rims from Carid put on my solstice & found Carid very helpful as to whether or not they would fit . I had to use hub center rings for the fit. I went with TWS Silverstone rims & have had no issue with the rims so far as they only stuck out slightly from the original wheels. I also applied ceramic pro to the rims & installed new tpms sensors .It was a real education for me in learning about the dynamics of the fit. Good luck with your selection.
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post #5 of 13 (permalink) Old 07-24-2019, 05:50 PM Thread Starter
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Quote:
Originally Posted by JohnWR View Post
Here is a pretty simple graphic that should explain it: ...
from that web site:

"When bolted up to your car this means that a lower offset wheel will stick out farther. If your car was originally equipped with a +50mm offset and you replace it with a +25mm wheel, the wheel will stick out approximately one inch farther. "

so........ if the wheel sticks out an inch, is that street legal ?

Sir William's Fleet
Mean 2007 NA 2007 Solstice ordered on 8/24/06 - Picked up on 12/12/06 - Totaled on 6/12/10
Mean 2008 GXP Acquired 6/21/10 with 1275 miles on it - Summer Solstice !
Deep 2009 NA Coupe Acquired 11/2/13 with 1040 miles on it
Mean 2009 GXP Coupe Acquired 8/27/16 with 9100 miles on it
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post #6 of 13 (permalink) Old 07-24-2019, 07:27 PM
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That link JohnWR posted helps explain backspace. I should have read it before posting my question about what is backspace.

Basically, the opposite of offset. When one moves, so does the other.

Still, anyone know what the backspace is on our OEMs?

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post #7 of 13 (permalink) Old 07-24-2019, 08:11 PM
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Quote:
Originally Posted by Bama View Post
Still, anyone know what the backspace is on our OEMs?
4 inches plus 55mm, so about 6.165354331 inches.

Close enough?



.



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post #8 of 13 (permalink) Old 07-24-2019, 08:38 PM
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Thank you, DaveOC!

Now I can complete my notes on the OEMs: Factory Wheel = 18x8 5 lug 110 bolt pattern 55 mm offset 65.1 mm center hub 6.1" backspace.

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post #9 of 13 (permalink) Old 07-24-2019, 11:11 PM
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............so........ if the wheel sticks out an inch, is that street legal ?
Street legal isn't really an issue in most places, but could be if you have an annual inspection. Interference between tire and bodywork could be an issue, though.

John
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post #10 of 13 (permalink) Old 07-25-2019, 04:49 AM Thread Starter
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so... I will have to add the 55mm offset requirement to my search for wheels...
( despite sites offering up other offsets... )

I do not want the wheels to hit the paint on the fenders....

Sir William's Fleet
Mean 2007 NA 2007 Solstice ordered on 8/24/06 - Picked up on 12/12/06 - Totaled on 6/12/10
Mean 2008 GXP Acquired 6/21/10 with 1275 miles on it - Summer Solstice !
Deep 2009 NA Coupe Acquired 11/2/13 with 1040 miles on it
Mean 2009 GXP Coupe Acquired 8/27/16 with 9100 miles on it
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post #11 of 13 (permalink) Old 07-25-2019, 06:42 AM
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Fender interference could be an issue, but might not be. I haven't paid enough attention to know.
I know that people have run wider wheels and tires, so there has to be extra room somewhere.

You might be able to find posts about wider wheels and use whatever sizes have worked to determine what the tolerance is inboard and outboard.
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Sky NA 2007 Midnight Blue
Sky RL 2008 Carbon Flash - Naked

Last edited by JohnWR; 07-25-2019 at 06:46 AM.
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post #12 of 13 (permalink) Old 08-27-2019, 02:53 PM Thread Starter
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just to close this thread, I found a near-perfect set of OEM chrome wheels for sale on FB, so I bought them.
Total cost of $636 and they appeared in NJ.

I have to buy TPMS however.

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Sir William's Fleet
Mean 2007 NA 2007 Solstice ordered on 8/24/06 - Picked up on 12/12/06 - Totaled on 6/12/10
Mean 2008 GXP Acquired 6/21/10 with 1275 miles on it - Summer Solstice !
Deep 2009 NA Coupe Acquired 11/2/13 with 1040 miles on it
Mean 2009 GXP Coupe Acquired 8/27/16 with 9100 miles on it
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post #13 of 13 (permalink) Old 09-03-2019, 01:07 PM Thread Starter
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part number TPMS - oem # 20925924
nut to hold the sensors that did not come with the sensors - oem # 15234846.


( note that when I bought the TPMS, the nut was included. - best to double check... )

Sir William's Fleet
Mean 2007 NA 2007 Solstice ordered on 8/24/06 - Picked up on 12/12/06 - Totaled on 6/12/10
Mean 2008 GXP Acquired 6/21/10 with 1275 miles on it - Summer Solstice !
Deep 2009 NA Coupe Acquired 11/2/13 with 1040 miles on it
Mean 2009 GXP Coupe Acquired 8/27/16 with 9100 miles on it
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