ET definition, check my understanding and logic, please?
#1
Rennlist Member
Thread Starter
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As I understand, ET = The distance that the wheel-to-hub mounting flange differs from the true centerline of the wheel and that this flange for most common P car wheels is to the “outside” of the centerline of the wheels, ( and the car
). Just to confuse things, I would consider this negative offset since more of the wheel is to the center of the car
Postulate #1. So a wheel with an ET of 67 = a wheel whose flange is 67mm to the outside of the wheel centerline.
True?
False?
Postulate #2. If true, then I am assuming that a car that is stock with ET67, can use wheels ET 57 and still get similar fitment if 10mm hub-centric spacers are used.
True?
False?
I know that there are many variables involved and ET67 may not exactly = ET57 + 10mm spacer, let’s just consider it a thought experiment for now.
At least until I post photo’s.![Wink](https://rennlist.com/forums/images/smilies/wink.gif)
Thanks
Craig
![Roll Eyes (Sarcastic)](https://rennlist.com/forums/images/smilies/rolleyes.gif)
Postulate #1. So a wheel with an ET of 67 = a wheel whose flange is 67mm to the outside of the wheel centerline.
True?
False?
Postulate #2. If true, then I am assuming that a car that is stock with ET67, can use wheels ET 57 and still get similar fitment if 10mm hub-centric spacers are used.
True?
False?
I know that there are many variables involved and ET67 may not exactly = ET57 + 10mm spacer, let’s just consider it a thought experiment for now.
At least until I post photo’s.
![Wink](https://rennlist.com/forums/images/smilies/wink.gif)
Thanks
Craig
#2
![Default](https://rennlist.com/forums/images/icons/icon1.gif)
As I understand, ET = The distance that the wheel-to-hub mounting flange differs from the true centerline of the wheel and that this flange for most common P car wheels is to the “outside” of the centerline of the wheels, ( and the car
). Just to confuse things, I would consider this negative offset since more of the wheel is to the center of the car
![Roll Eyes (Sarcastic)](https://rennlist.com/forums/images/smilies/rolleyes.gif)
offset o/s - ET - Einpress Tief (PUSHED IN DEPTH )
It's positive when the mounting face is outboard of the wheel centerline, negative when the mountiong face is inboard(deep dish look)
![](http://members.rennlist.com/1976c38/Wheel%20measures.jpg)
Manufacturers #s are as exact as you can get, unfortunately when folks try to measure their own the results are often less than satisfactory.
#3
Rennlist Member
Thread Starter
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Most would call it the mounting face not flange
offset o/s - ET - Einpress Tief (PUSHED IN DEPTH )
It's positive when the mounting face is outboard of the wheel centerline, negative when the mountiong face is inboard(deep dish look)
![](http://members.rennlist.com/1976c38/Wheel%20measures.jpg)
If by 'flange' you mean the mounting face, then yes, this is positive o/s
no, a spacer is negative. when adding a spacer the ET is reduced by the thickness of the spacer, an ET 67 w/ a 10mm spacer becomes an ET57, an ET57 w/ a 10mm spacer becomes ET47 etc.
offset o/s - ET - Einpress Tief (PUSHED IN DEPTH )
It's positive when the mounting face is outboard of the wheel centerline, negative when the mountiong face is inboard(deep dish look)
![](http://members.rennlist.com/1976c38/Wheel%20measures.jpg)
If by 'flange' you mean the mounting face, then yes, this is positive o/s
no, a spacer is negative. when adding a spacer the ET is reduced by the thickness of the spacer, an ET 67 w/ a 10mm spacer becomes an ET57, an ET57 w/ a 10mm spacer becomes ET47 etc.
I've printed your drawing and response so that i can review it and noodle on it a bit during my flight to Seattle tomorrow.
cheers
Craig