ET definition, check my understanding and logic, please?
03-21-2009, 04:23 PM
#1
Rennlist Member
Thread Starter
ET definition, check my understanding and logic, please?
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.
Thanks
Craig
). Just to confuse things, I would consider this negative offset since more of the wheel is to the center of the carPostulate #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.
Thanks
Craig
03-21-2009, 05:50 PM
#2
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
). Just to confuse things, I would consider this negative offset since more of the wheel is to the center of the caroffset 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)
Manufacturers #s are as exact as you can get, unfortunately when folks try to measure their own the results are often less than satisfactory.
03-22-2009, 11:36 PM
#3
Rennlist Member
Thread Starter
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)
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)
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
