Charger SRT Hellcat
Some observations: I've had a an 2006 SRT Charger, 2017 Hellcat Charger, and 2020 Charger Hellcat which all had 20 inch tires. I don't remember what tires were on the 2006, but the 2017 and 2020 both had Pirellis. They all shook at higher speeds. I work at a dealer and used to balance the tires on the 2006 almost weekly (probably wasn't doing it right) and never got it to not shake until I finally replace the tires with Potenzas. They were pretty darn smooth. Then I sold it. I had Discount Tire road force balance the Pirellis on the 2017. It got good, at times, but never SMOOTH. I just lived with it. I had the tires on the 2020 road forced balance by Discount. after moving tires around repeatedly. I finally got to where the steering wheel didn't shake at all......usually. If I drove the car the day before, it was almost perfect. If it sat a few days or more, it shook for a time, as others have mentioned. Here's an interesting phenomenon: there is a long street that leads to the freeway where I typically do 70 mph or more (in Mexico). It has a long sweeper to the left. If I was going fast, it would often began to shake about halfway through this sweeper. At slower speeds it didn't. I'll assume the tire began to deform to the side causing this. I'll be getting my new 2021 in a few weeks and fully expect it to shake. It's a shame that they can't make a Charger with 20s that doesn't shake. Interestingly, my 2018 Pacifica with 20 inch tires is smooth. Always! Also, my 2008 GT500, 2010 GT500, 2012 GT500, and 2013 GT500 NEVER shook at all.