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Old 07-23-2011, 07:59 PM   #1
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Wheel Size

This may be basic (but I've never read my wheels before). On my front OEM wheels, on either side of the valve stem, the front say 7 55 and the rear say 8.5 50. I'm sure the 7 and 8.5 are the wheel width but what do the 50 & 55 indicate?

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Last edited by DenverSteve; 07-23-2011 at 08:04 PM.
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Old 07-23-2011, 08:15 PM   #2
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Rim Offset. Here is an excellent link: http://www.1010tires.com/WheelOffsetCalculator.asp
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Old 07-23-2011, 08:34 PM   #3
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Thanks. I never read my Cayenne wheels. It's obviously different when the front and rear wheels are different.
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Old 07-24-2011, 07:55 AM   #4
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You'll commonly see the German abbreviation for offset, ET or et. The diameter and width of a wheel are in inches while the offset is in millimeters. For example, 18x8.5 et 45 is a 18" diameter, 8.5" wide wheel with 45mm offset.

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