Has anyone else upgraded to the 19 inch Pirelli Pzero Summer RF tires from their OEM Bridgestones on the F30 335i Sport? What a difference! They're pricey, but in my opinion, worth the effort! Much stickier, and great road feel. A knowledgeable friend told me for giant BMW wheels like this, oftentimes the dealer is the best choice, due to the specific rim profile of BMW rims and their propensity to bend or break when mounting low-profile tires. Shops that don't do a lot of large BMW rims may not have experienced staff. Also, BMW dealers are about the only place that will actually set weights in the car for alignment - I've never seen or heard of an independent shop doing this. Let me know your experiences too. Thanks.