Understanding what et31 means - Team Camaro Tech
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post #1 of 8 (permalink) Old Jul 9th, 07, 09:38 AM Thread Starter
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Understanding what et31 means

Not really a Camaro question but I really didn't want to have to join another forum to ask this question. I'm looking at getting some wheels for the wifes car and it says it has an offset of 35 (I know what that is) but the front has an et31 and the rear an et 20. What does that mean?

Dennis
69 Z/28. 302DZ, Autogear M22, Red w/black stripes.
69 Camaro, ZZ4, 700R4, 8.5 3:42 posi, X11
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post #2 of 8 (permalink) Old Jul 9th, 07, 11:07 AM
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Re: Understanding what et31 means

Quote:
Originally Posted by madmax87 View Post
Not really a Camaro question but I really didn't want to have to join another forum to ask this question. I'm looking at getting some wheels for the wifes car and it says it has an offset of 35 (I know what that is) but the front has an et31 and the rear an et 20. What does that mean?
ET is an abbreviation of the German word for offset.
I don't remember the full German word, but it's not really important.
All German cars use this for sizing and any good wheel seller knows this.
ET is measured in millimeters (mm).
A staggard front/rear ET usually means you have wider wheels and tires in the back, which is common on German rear wheel drive performance cars like the BMW M3.
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post #3 of 8 (permalink) Old Jul 9th, 07, 12:24 PM Thread Starter
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Re: Understanding what et31 means

Thats whats weird. They said all 4 wheels have a 35 mm offset and then these numbers where in there too. Possibly backspacing.

Dennis
69 Z/28. 302DZ, Autogear M22, Red w/black stripes.
69 Camaro, ZZ4, 700R4, 8.5 3:42 posi, X11
70 Nova SS 396, 4sp, 3:55 12 bolt
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post #4 of 8 (permalink) Old Jul 9th, 07, 05:42 PM
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Re: Understanding what et31 means

Offset/ET/Backspacing all mean the same thing.
When you say "it says it has an offset of 35" who or what is "it" and what has et31 and et20?
What year/make/model are you talking about?
35 is probably the et for the stock same size front and rear, and the other et's are probably to fit maximum size tires in staggard sizes
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post #5 of 8 (permalink) Old Jul 9th, 07, 06:30 PM
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Re: Understanding what et31 means

James - I know what you mean but offset and backspacing are different measurements used to express the same thing. Here's a conversion chart from Back Spacing to offset based for different wheel sizes...

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post #6 of 8 (permalink) Old Jul 9th, 07, 06:58 PM Thread Starter
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Re: Understanding what et31 means

Here is the link to what I am looking at. My wife drives a 2003 G35 coupe. Currently her car has stock 18" wheels, 30mm offset, 225/45/18 front, 245/45/18 rear. I just want to know if these rims are basically a direct replacement for what she has. I guess the different ET numbers is what is throwing me off course. If that is just something to do with what tires I can go with, that makes sense. Sorry about the confusion.

http://cgi.ebay.com/ebaymotors/ws/eB...139674792&rd=1

Dennis
69 Z/28. 302DZ, Autogear M22, Red w/black stripes.
69 Camaro, ZZ4, 700R4, 8.5 3:42 posi, X11
70 Nova SS 396, 4sp, 3:55 12 bolt

Last edited by madmax87; Jul 9th, 07 at 07:24 PM.
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post #7 of 8 (permalink) Old Jul 9th, 07, 10:00 PM
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Re: Understanding what et31 means

Quote:
Originally Posted by madmax87 View Post
Here is the link to what I am looking at. My wife drives a 2003 G35 coupe. Currently her car has stock 18" wheels, 30mm offset, 225/45/18 front, 245/45/18 rear. I just want to know if these rims are basically a direct replacement for what she has. I guess the different ET numbers is what is throwing me off course. If that is just something to do with what tires I can go with, that makes sense. Sorry about the confusion.

http://cgi.ebay.com/ebaymotors/ws/eB...139674792&rd=1
Your back tires should be a lower aspect ratio than the fronts.
Are you sure they are not 245/40/18?
Contact the seller, and get them to confirm the rims will fit.
I know of this shop (Globe), they are just a few miles from my home and have a very high end clientele.
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post #8 of 8 (permalink) Old Jul 9th, 07, 11:38 PM Thread Starter
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Re: Understanding what et31 means

Went and checked size again and they are both 45's. That size is also listed for both on the plate on the door.
I've tried to contact the seller and he has not returned any of my emails. Maybe business is really good.

Dennis
69 Z/28. 302DZ, Autogear M22, Red w/black stripes.
69 Camaro, ZZ4, 700R4, 8.5 3:42 posi, X11
70 Nova SS 396, 4sp, 3:55 12 bolt
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