I have a 2019 Challenger HC RE WB and just went through this whole process. At first I was living with the stock Pirelli all-seasons. Next, I had decided to go with Michelin PS4s in the stock size (305-35-20) on the stock wheels. But as you're no doubt figuring out, the car is severely under-tired in the rear. So now I've bit the bullet. Triumph Wheels is making me a set of 20 by 11" front wheels and 20 by 12.5" rear wheels which will have Michelin PS4s sizes 305-35-20 on the front and 345-30-20 on the rear.
