@DES_MX This thread is worth a read:
Yesterday I drove over a small defect in the roadway at about 35-40 MPH with my 2021 M3P that has 20" rims with Pirelli tires. It was a small rectangular section of roadway about 6" x 8" and maybe 3/4" or less deep that the asphalt was missing from an incomplete road repair. The sidewall on both...
teslamotorsclub.com
Normally I'd suggest evaluating ride quality on your test drive, everyone's preferences and tolerances are different, however it sounds like you don't have bad roads nearby to test on.
Coming from a background of sport compacts, I think the stock 2021 M3P ride quality is perfectly fine. Is it *good*? No, it's worse than most cars in its price range. The M3LR and M3P suspension rides a little busy (I didn't test SR+/RWD), and the M3P rubberband-thin + stretched tires certainly don't help. Also if you really drive hard on really rough roads, you can overwhelm the stock dampers, their performance is a little lacking compared to higher end dampers for a car that's capable of going quite fast.
But again, I don't find the ride quality bad. I don't love the ride quality but I don't hate it, it's not a defining feature of the car for me. (Side note: I hated the 2021 MYLR ride quality. Couldn't stand it for a family crossover/CUV. You might think the 3 and Y would ride and drive similar, but they don't, at least not to me.)
What you should be worried about with the 20" Uberturbines on bad roads is bending and cracking them. The thread I linked above covers it well, I suggest reading through the whole thing. I'll also link directly to some posts I made in it...
Big Tesla OE cast wheels cracking:
https://teslamotorsclub.com/tmc/posts/6168579/
First impressions after switching to 245/45R18 Bridgestone Potenza Sport on 18x8.5" forged wheels:
https://teslamotorsclub.com/tmc/posts/6240321/
Driving impressions after putting some miles on the new setup:
https://teslamotorsclub.com/tmc/posts/6247121/
Summary:
1) Ride quality is definitely improved, but I chose performance tires with stiff sidewalls. The car still rides and feels like a Model 3, the ride is not transformed into something different.
2) I was surprised how much better handling, grip, and overall driving feel is! The tires are definitely better than the OE Tesla-spec Pirelli PZ4, that's a big part of it. The power steering feels better too, I think it almost struggled with the weight before. The car feels more nimble making quick back-and-forth direction changes on twisty roads. I knew the stock Uberturbine wheels are HEAVY but I really wasn't expecting to feel this much benefit from lighter wheels.
For sure I would've been happy with decent cast wheels, but I'm glad I spent some extra money on forged. (Even though I went with one of the cheapest forged wheel brands/lines, as that's all I could justify budgeting for.)