I'll reiterate what I've concluded on other threads. Other than the super sexy way they look, I'm generally disappointing with the 21" wheel/tire combo. the list has grown long: they are so prone to curbing that even the best efforts, even with alloygators, results in frequent scuffs if anyone but me is driving and from what I hear on line, they are prone to catastrophic failure due to pot holes and such. On top of that the suspension and alignment results in a veritable cheese grater on wheels. If you go with the 21's, expect crazy frequent replacement even with moderate driving and don't forget, it's an expensive barrel of oil per tire you are adding to your consumer foot print. On the P+, they are loud, as in super loud on anything but smooth surfaces and that gets worse as it gets colder. Even with moderate cold and a little rain, the performance plummets to worse than all season by a long shot (especially bad on the P85, leading to a very squarely back end fishtail sensation even with moderate acceleration in cold and damp). Even in the warmer dryer times, the tires have to be allowed to warm up for 10+ miles before you can expect them to have good traction, I'm told that's true of all performance tires. Also they are less conforming, hence the cheese grater effect on the rear insides due to increased negative camber as well as what appears to be a toe out that occurs for many as the back end "breaks in" initially from all that luscious torque (though I hear the initial acceleration torque has been limited with 5.8, presumably for that reason).
I can't say enough about Tire Rack, the guy who owns it owns a Tesla S and has put together a very nice 19" package just for the S, you even get the proper lug nuts for the S thrown in for free if you buy a set of four. They send them to your door, mounted, balanced and inflated. 19 Rial Lugano's with Michelin Primacy MXM4 (same tire as Tesla OEM) look better than either Tesla's standard 19's or the turbine 19's and are a fraction of the price and you get a warranty (no warranty on Tesla OEM's!). They are now well proven to be adequate in terms of load/engineering.
My advice, if you live in warmer areas and or love super high performance tires, have at it, go with the 21's and don't feel guilty about feeding your passion. for the rest of us, I'd highly recommend the P85+ and selling the 21's and getting 19's, the ride is better, less noise, the performance is substantially improved over the P85 with 21's, your impact on the environment is reduced and your long term cost of ownership is substantially reduced. for everyone, keep a close eye on the inside rear, get a wear gauge, if you start to see much of any difference, have the alignment checked! I think much of the benefit of the P85+ carries over even when you switch to the 19's at least up north here. for those looking for the optimum performance that you can get with 19' wheels and an almost as sexy look, the P85+ with Lugano 19's
http://www.tirerack.com/wheels/Whee...lse&filterNew=All&filterWeight=All&sort=Brand is awesome, especially if you live up north where it gets wetter and colder much of the year. I'm liking the prospect of having one set of tires, no seasonal switching hassle and having them wear evenly and last 25K+ miles. It took a while but I think I've found the sweet spot, at least for me.
Tried 21s, it didn't fit. Tire to tire width was 191cm on 19s and 194cm on 21s. I'm guessing that P85+ with 19s will have the same 191cm. If not (=wider), I'll go P85 with 19s.
