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Compare rim sizes

 Center line original rim
 Center line new rim

Offset: the distance between the hub mounting face at the back of the wheel and the wheel's center line.
Offset is often referred to as ET. ET is the short form from the German word 'Einpresstiefe'.
The track width is the distance between the wheelsets. The distance is measured from the wheel center.

Original Rim:
Rim Size
Rim Width
Offset
New Rim:
Rim Size
Rim Width
Offset
Inner edge of the rim moves 7.7 mm (0.303") inside
Outer edge of the rim moves 17.7 mm (0.697") outside
Offset change: -5 mm (-0.197")
Track width change: -10 mm (-0.394")

Note:

Make sure that the track width does not exceed the recommendations specified by the vehicle manufacturer.
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