I also think 255/40 all around is better for winter set than 275/40 mostly because of narrow tires better for snow / winter.I would say that depends on depth of snow vs your ground clearance vs your goals, but in case of a mustang on public roads I totally agree with you.
The dampers go to minimum force and you're limited to 80 mph. It's not catastrophic, but it does bounce around like a 70's Oldsmobile.Semi on topic, what happens exactly when/if something in the MR system shits the bed?
In fail mode, does the shock/strut go super firm or limp noodle?
if only if you have the right springs to get the ride frequency right. Then you wouldn't need to worry about damper failure modes. /snarkThe dampers go to minimum force and you're limited to 80 mph. It's not catastrophic, but it does bounce around like a 70's Oldsmobile.
This worked out great size wise. Thanks for the input. I went with WINTER SOTTOZERO SERIE II - SIZE: 255/40R19 all the way around. Almost same height as 265/35/20s which is nice for speedo readings.just shod them with 255/40 all around and you're good to go. You can even rotate them with a 5mm spacer up front when you put the 9.5 wheels up front. Plus they have a heavy paint coating which will stand up to salt and sand way better than many aftermarket wheels.
the Conti DWS 06 are a UHP 3-season tire that WILL flat-spot overnight in cold temps and go thumpa-thumpa-thumpa for a while till it warms up. Ditto BT 980AS, Hankook Noble 2, BFG Comp2a, General Gmax-as5. The Pirellis didn't or it was only slight but they also felt sketchy in wet. The DWS really feels good but soft. It gets to 20F often enough in Virginia but around here we don't get snow worth a damn except once or twice a season but the crews are good at removal. If snow is a common thing, get winter tires. There's plenty of options in 255/40/19'ish to choose from.
Figure out what size tire is available and then buy a wheel to match. Winter tires are frequently relatively narrow. 19x9 is probably the best compromise since you can generally use 245-275 tires. 19x8.5 wheels are a dime a dozen but your size options go narrower, obviously. Yes, you can still be a 'man' and drive a GT mustang on 8.5 or 9 wide wheels.