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Definitely not under-pressurized… Rivian has a Recommended tire pressure, it takes into account the LOAD, CONTACT PATCH, and a number of other parameters (safety, handling, performance, etc. An acceptable tire pressure range might look something like 38-50 PSI. With 38 being a minimum for load...

45 instead of 48 mm offset shifts the tire 1/8” out, this is pretty negligible. I would keep 48 mm since that’s how Rivian designed it.

Stock size is 20x8.5, I would avoid the 20x9 unless you had a specific tire in mind and you were ok with not using the lowest ride height. Doesn't sound like you have a reason for 20x9 (unless you like/want a slightly wider stance).

Those look awesome, nice choice! 2 very impressive aspects of this tire: It's a lightweight LT (only 46#) It has 18/32 tread depth, similar tires in this weight range are 13-14 only... Price is reasonable at $318... [Riviot - think this might be the one you are looking for!]

Wow - didn't realize it has so much open area, should be solid for rain/snow/ice, curious to see how the efficiency is since it's definitely AT-oriented...

I was under the impression that NHTSA plays a consumer protection role in regulating and overseeing the UTQG ratings to ensure the accuracy and reliability of the tests…

I did not

Understood, it sounds loosey-goosey. How do you approach UTQG? Would you group the 580 and 660 and say they are “close enough” and maybe a 720 and 800 are also in the same category? Traction seems less manufactured but I can’t say for sure. What about temp? Is that also worth ignoring...

I’d say it’s really good, actually. They ride much much better. There is zero noise. They are 3PMSF And they cost about half as much

I think it's slightly better than the OEM Pirellis, a 900 mile trip in April with OEM tires ended up being ~1.97 MPK. It was cooler weather so no AC but increased air density likely meant a little less efficiency. Ultimately, these tires ride so much better than the OEM Pirellis, they get same...

Updated with a 176 mile one way trip today (Conserve w/ AC running), tires are ~2.2 MPK.

Yes, any of the options 25-26# should be best efficiency (ignoring individual aero effect).. My top 3 choices for efficient 3PMSF (on the AWZ1 Rim): I'd lean to each tire as follows: Yoko - All Weather, limited/no offroading, best snow/rain/ice performance Goodyear - Best efficiency, limited...

Yes Atomic Wheels AWZZ or AWZ1 for best efficiency. Best 3PMSF tire options: Tire UTQG / Load-speed Weight Width / $ Yoko Geo CV 4S 660 AA / 116H 41 8.1" / $255 OEM 20" Goodyear 580 AB / 116H 42 8.8" / $236 Maxxis Razr 600 AB / 116S 43 ? / $252 Nitto Nomad Grappler none 45 9.1" / $250...

Those look nice! I think the Defender is the best tire to get for handling/efficiency/treadwear, please report back once you have some data, here's detail on tire pressure, load, and the tread diameter in contact with the ground (contact patch) - 48 PSI is to maximize efficiency by minimizing...

I have the Yokohama Geolandar CV 4S (275/60R20), I'd say they are about the same as the OEM 20" Pirelli. The new 20" OEM Goodyear will likely be similar. I also like the Nitto Nomad Grappler, I think it will be nearly identical, so there are at least 4-5 3PMSF tires available in the 275/60R20...

Min 48 PSI Max 50 PSI These are cold pressures, it's ok if hot pressures are 2-4 psi above max (so 53-55 max).

Please let me know when/where and I will cheer from the sidelines and film when they haul you off!

Thanks, that’s a good summary and makes sense to me. After 180k miles in a M3, I get whatever tire is lightweight, cheap, meets some basic specs, usually wider than stock, maybe slightly taller too. Getting more tread too as long as weight doesn’t go up too much. Has worked will for getting...

Here’s last 280 miles. Average speed of 40 mph. 2.15 MPK adjusted: Treadwear is ~11/32 after 2400 miles, seems like it’s slowed down, so hopefully will get another 15-20k miles or so…

Long live the 21s! …or not…