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      05-28-2012, 10:53 AM   #5
Drifty//
First Lieutenant
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Drives: A4 quattro 3.2 MT6; E92 6MT
Join Date: Mar 2012
Location: Boston

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Look at the specs tab, on this page:

Direzza Sport Z1 Star Spec (tirerack.com)

One of the columns is "Rim Width Range". I'm guessing they got this info from the manufacturer, in which case you might be able to find it on Nitto's website or from a Nitto distributor. However, it seems unlikely there's much variation between different tires of the same size.