I found the quote from Edmunds.....
"Handling Skidpad: .90g Slalom: 70.0 mph
These numbers are both lower than our previous test car which was fitted with the optional 19-inch Michelin Pilot Sport rubber (our car has 18-inch wheels). We also tested the M Dynamic stability control mode which produced .87g on the skidpad and a 69.4-mph slalom speed."
"And the wheels: He chose 18s because he likes the way the look. "They've got dish," says Oldham. But they don't have dish. Not any that matters anyway. He pointed out that they do, however, cost less -- the 19s are a $1,200 option. But according to the hairsplitting M3 nerds on M3 post.com the 19s (with tires) actually weigh less.
Thing is, they might just be worth it. I think they look better and the last M3 sedan we tested with 19s outhandled our car."
These are 2 blog entries from the following link.
http://blogs.edmunds.com/roadtests/V...s/2009-bmw-m3/