http://www.tirerack.com/tires/tirete...jsp?techid=198
http://www.tirerack.com/tires/tirete...jsp?techid=199
Tirerack lists the one Measured rim width, and a range (usually 0.5" under to 1.0" over measured).
Tirerack lists the 285/35/18 PSS as 9.5" to 11", with measured of 10".
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2009 BMW 135i 6MT Sport, AFE intake, Cobb AP, Apex 18x8.5+9.5, 255/275 PSS