I recently had the sharp end of a box cutter blade embedd itself in my 575's right rear tire. Totally unrepairable due to the nature of the gash (half inch across). The tire pressure monitor worked flawlessly and warned me at 20 PSI and dropping that I had a problem. I hate to think what could have happened to the rim with 35 profile tires if I only discovered the puncture once the tire went completely flat. I filled the tire with the gunk-in-a-can and got the car home. There were no tires available locally so I went online and ordered two new rears from tirerack.com. Great service, arrived in two days. Now, how do I get them fitted? Online once again, to Google and I unearthed a brand new operation in town, AZ Mobile Tire (azmobiletire.com). They came to the house, removed the offending tire as well as the oldie but goodie, put the new ones on and balanced and re-installed in about an hour. Total cost - $75.00! A great deal if there ever was one. Usual disclaimer - I have no financial or otherwise interest in this Co. Just a couple of good guys who saved me a bunch of hassle and bother. It turns out that they could have ordered the tires for me as well.