Wheels, Offset, and How to Calculate Fitment

When fitting aftermarket, or custom wheels, you should check for any clearance issues.

Incorrect fitment or Rubbing will wear out your tires, bearings, and cause other suspension components to fail or wear prematurely.

Offset is the measurement in millimeters from the wheel centre line to the wheel mounting face.
More often than not, offsets are positive(+) where wheel styles tend to be flush or convex.
Negative (-) offsets tend to have concave styling and the use of spacers. 

The Offset, or "ET" (Einpress Tiefe translates to Press Depth in German),
determines the distance between the centre of the rim surface and
the face of the wheel where it is bolted to the hub.

WARNING: Incorrect offset can seriously affect vehicle performance.

Example:

This stock 4.5" x 10" Mini Cooper S alloy wheel has a POSITIVE Offset of 35mm.
It would be seen as 4.5" x 10" wheel, 4 x 4" lug pattern, Offset of ET35.

This Minilite 6" x 10" Mini Cooper S wheel has a POSITIVE Offset of 15mm.
It would be seen as 6" x 10" wheel, 4 x 4" lug pattern, Offset of ET15.

This Super Trax 7" x 13" Mini Cooper S wheel has a POSITIVE Offset of 7mm.
It would be seen as 7" x 13" wheel, 4 x 4" lug pattern, Offset of ET07.

This Alleycat 7" x 13" Mini Cooper S wheel has a NEGATIVE Offset of 7mm.
It would be seen as 7" x 13" wheel, 4 x 4" lug pattern, Offset of ET-7.

a wheel with NEGATIVE (-) 15mm OFFSET or ET would be shown as ET-15
a wheel with POSITVE (+) 7mm OFFSET or ET would be shown as ET07

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