[W126 Coupe] ET (Offset) Explained and Illustrated

[Axel Wulff]

Here is the best explenation I have come across for understanding ET issues.



Wheels are usually built so that the actual mounting surface (to the hub) is 
well outboard of the wheel centerline. This both helps clear the brake 
assembly and also places the center of loading closer to the wheel bearings. 
Thus, the wheel's offset, often measured in millimeters, is the amount the 
mating face has been moved outward from the centerline.

If wider tires which interfere on the inside sidewall with shock dampers or 
other suspension components are mounted, spacers can be added between the 
hub and the wheel itself. This has the effect of actually reducing the 
offset. That is, a wheel whose offset is marked "ET32" used with a 10 mm. 
spacer fits the same as a wheel marked "ET22".



Regards,
Axel J. Wulff

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