I installed the Conti DWS 19" on my 2011 35i two weeks ago. They are fantastic tires.

Great traction in a 17" snow storm and more importantly, not the jarring ride over bumps like the OEM Bridgestone runflats.

Overall ride is much improved. Can't say enough good things about them.

And I owe a thank you to the Discount Tire guy that hunted them down for me. They are very hard to find right now.