Quote:
Originally Posted by Delta5
I'm pleased to confirm that the OEM 18" 796M set will indeed fit a M340i with the HP Tire & Cooling (ZTK) package. 
Ordred them from my dealer. Took 4 business days to arrive. $2,4xx out the door, including dealer installation and storing the off-season tires. I've only driven on them for about 25 miles, but the ride quality is improved. Especially with temps in the 50's today, the P4S's were getting hard. Less crashy over bumps, and feels just as responsive in normal driving. Smooth and quiet at 75+. I'm very happy with the results.
Before (yesterday), 19" 792M with Summer Michelin PS4S...
Front...
After, 18" 796M with Pirelli Sottozero...
Front rotors don't look much different than with the 19's. Calipers are close but they're no tighter than with the 792M's.
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I have a M440i on order with the cooling package and 19" wheels. I was thinking of buying the same wheels you have from BMW. I just wanted to confirm you have the larger 374mm front rotors. Did you have the option of buying the Pirelli's? In Canada, the tire is a Blizzak LM-001 which I understand is not that great a tire.