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      03-02-2009, 10:56 PM   #22

Drives: 2010 M5 6 spd
Join Date: Jan 2007
Location: Indiana

Posts: 76
iTrader: (0)

Originally Posted by GregW / Oregon View Post
Thanks for that. Is that the same as use for the X3 (my post #11)? That calcs out to an inch or more smaller OD than stock. Wonder if there is a 125/80-18 available?

Edit: I just found that the Cadillac CTS uses a 135/80-18, which, at ~26.5", would be a little larger than the stock 26.3" rear.

I'm sure you could have an adapter machined pretty easily, but would be nice to find a pre-made one. Do you know the centerbore diameters? X5 is 74.1, so I assume X6 is the same? (M3 CB = 72.56).

Edit: I found the proper hubcentric plastic rings here (74.1/72.56): $21/set of 4.
Dear Greg,

That's great. Are you sure about the respective diameters? If so, I'll order the right ring pronto. Thanks for finding this.

My dealer checked the available sizes--at least the ones available a few months ago--and I believe the 125/70-18 tire is the best size available for this use.