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      07-21-2010, 07:38 PM   #3
BimmerPost Supporting Vendor

Drives: E30 M3, F10 M5
Join Date: Jun 2009
Location: Bay Area, CA

iTrader: (6)

Originally Posted by Jack328iE92 View Post
Sorry for the dumb question, but why is 18x9.5" et62 lighter than 18x8.5" et38.
Because the barrel is flow-formed (roll forged), the barrel has very little weight to it vs. the metal in the center hub area around the lugs. The 8.5" wheel has a lower offset, so it has more metal in that area, resulting in a slightly heavier overall weight. Plus slightly less spoke material is needed on the 62mm offset wheels to make them strong. The wheel is so flat that it transfers loads much easier to the hub.

It threw me off to, but when you look at the back side, you can see the differences that cause it.

To note, the ET62 wheels are for the 135i rear only and not for the 335i