First, this is a modified 850 GLT; chipped, cold air induction w/K&N filter, IPD blue springs, sway bars, yellow Konis, and right now sporting the autotragic. As you might correctly surmise, I am a somewhat feisty driver. These tires are 225/40-17's on the Sport 5-spoke F7 7.5x17 wheels. I haven't had a tire off to weigh the wheels, but I would be very surprised if they only weigh 20.8 lbs, but they seem to be stiff and are attractive without being gaudy. These are without any reservation THE BEST tires I've ever owned. I don't know how long they'll last, and the 9's I gave them for noise and ride, well, heck, they're a performance tire and my car is MUCH stiffer than stock. Fair is fair. I'm 56 and have driven at least 750k miles in my life and have never had a better tire. I'm in Seattle; wet performance was a serious consideration..these are nothing short of magnificent in the wet, and, even though they're not designed for snow, they're okay. In fact, their performance at around freezing doesn't seem to be significantly diminished. In contrast, the General UHP is definitely affected by lower temperatures. Of course, the UHP is about 1/3 the price! I have the UHP's on my Miata and like them pretty well-much better than the stock Bridgestones. And the Michelins are stunning on dry pavement. I definitely WILL buy these again, and I highly recommend them. In fact, a good friend just put a set on his 2007 Audi A4-chipped, with coilovers, and loves them. I believe he bought 245/35/19's for 19x8.5 rims. One caution-the 225/40/17's DO require a lip roll on the 850 as well as some trimming of the fender liner-the 215's probably would fit without mods.