On my X5d with 20" i have 12mm front and 20mm rear on the ///M I have 15mm up front and 25mm in the rear and I wouldn't change a thing. I have seen 30mm in the rear it was a little much for me personally. I am not sure I have any pictures uploaded to my photobucket...I'll see what I can find and post back.
I have H&R spacers the rears bolt to the hub and then the wheels bolt to the spacer and the front spacer uses longer bolts. The rear hubs are smaller than the front 74.2 vs 72.2 (roughly I might be off by 0.2) the spacers still retain the hub centric set up.
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X5M, Eisenmann exhaust, 22" HRE wheels, catless down pipes, Stage II tune/X5 Diesel, Lowered & Tuned
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