Been waiting for the 19x9 T-S5 wheels myself for some time (delayed production). Was planning to wrap 245/40/19 tires. Depending on the tire compound as well as design the width could vary somewhat greatly as well as the rolling resistance. I have a suspicion than the Pilot Super Sports might protect the rim the most out of most normal street tires because the tread width is marginally wider than most other tires in the same size and performance category - 1/2" wider than the newer PS4S.
I got my first flat with the OEM 20" wheels - which was a $440 replacement from Tesla so I think downsizing is the right way to go...but I am having second thoughts...the 20" size just looks amazing on the car. Pay to play...sigh.
Would love to see some photos of a Model 3 with these wheels - very few examples seen online.