Tires. All Season or All-Terrain?

[azjohnny]

How do AT's fare on pavement in the rain compared to AS's? I ask because heavy rains are something I will encounter in south Florida much more than rough terrain.

It depends on the tire. during the monsoon season here in AZ I have never had any problems with the Toyos

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[skyote]

How do AT's fare on pavement in the rain compared to AS's? I ask because heavy rains are something I will encounter in south Florida much more than rough terrain.

AS are better on wet surfaces & especially heavier rain/puddling, because they channel water better.

ATs are normally fine too, but there's a lot of empirical data that AS are better in wet conditions (stopping distance, ability to avoid hydroplaning, etc).

 

[skyote]

How do AT's fare on pavement in the rain compared to AS's? I ask because heavy rains are something I will encounter in south Florida much more than rough terrain.

Throwback video (early 90s) that's kinda funny to watch, and also educational.

 

[PostMinivanDad]

Some additional information on the OEM tires here:

https://www.the360mag.com/pirelli-tires/

I don't know this site and no sources are provided, but the writing seems to be mostly from some corporate news release or copied from some trade site behind a pay wall.

 

[cohall]

Some additional information on the OEM tires here:

https://www.the360mag.com/pirelli-tires/

I don't know this site and no sources are provided, but the writing seems to be mostly from some corporate news release or copied from some trade site behind a pay wall.

Good find!

Assuming this source is legit (I believe it is), a few potential takeaways I infer:

-To get the ranges published by Rivian, you’ll need to opt for the 21” low rolling resistance wheels/tires package

-To get the best grip and performance, and likely to get the 3 second zero to sixty, you need to opt for the 22” performance package

-This is only the second time there’s even been mention of a 21” option (the first being when RJ mentioned it in a recent video)

-The 20” Scorpion all terrains by Pirelli get excellent reviews already, and while the “RIV ELEC” version will be slightly different, it seems like it will be a great option for those of us who intend to go off-roading at all

 

[PostMinivanDad]

I kinda wish the summer Zero or Verde had been mentioned as OEM options being worked on. In places with mandatory winter tires like where I live, performance vehicles being delivered with all/4 season tires is, IMO, an annoyance: I don’t need the compromise in the middle of summer. Probably the same for buyers in places like AZ...Right?

Another question that will hopefully be answered when the configurator comes out…

I also wonder if Pirelli will make a winter tire for that 275/55 R21 Rivian specific size that was mentioned. I am not a fan of their winter tires, I think that would make me go for the 20 or 22 inch wheel options, as Nokian makes the LT3 (new, never tried it but the reviews seem good) in 275/65 R20 and the excellent (IMO after 6 sets), Hakkapelita 9 SUV in 275/50 R22.

 

[DucRider]

-To get the ranges published by Rivian, you’ll need to opt for the 22” 21" low rolling resistance wheels/tires package

Larger wheel sizes will almost certainly result in lower range and efficiency, and the Verde is specifically mentioned as a 21.

-To get the best grip and performance, and likely to get the 3 second zero to sixty, you need to opt for the 21” 22" performance package

The Zero is the only tire in the article without a size reference with the Verde at 21 and the All Terrain at 20, that kind of leaves 22 for the performance version.
On Pirelli's site, they offer 22" version of the Zero for other manufacturers like Bentley as their performance option.

 

[cohall]

Larger wheel sizes will almost certainly result in lower range and efficiency, and the Verde is specifically mentioned as a 21.


The Zero is the only tire in the article without a size reference with the Verde at 21 and the All Terrain at 20, that kind of leaves 22 for the performance version.
On Pirelli's site, they offer 22" version of the Zero for other manufacturers like Bentley as their performance option.

Yup, I fully flubbed the sizes. Thanks for the correction. I’ll fix my post.

 

[jimcgov3]

According to the Robert Pepper / Emme Hall Zoom interview, Pirelli worked directly with Rivian on developing the A/T tires for the R1T.

 

[skyote]

According to the Robert Pepper / Emme Hall Zoom interview, Pirelli worked directly with Rivian on developing the A/T tires for the R1T.

Emme also said she would prefer wheels even smaller than 20s, but it's not currently possible due to the brake size.

There have been similar conversations on threads here. I think I'll be good with 20s, but 18s would be even better IMO.

 

[Babbuino]

Emme also said she would prefer wheels even smaller than 20s, but it's not currently possible due to the brake size.

There have been similar conversations on threads here. I think I'll be good with 20s, but 18s would be even better IMO.

Absolutely, I'm guessing Rivian doesn't want to take the chance of people accelerating hard and not having enough braking power. Brakes and wheels all together may need to be an off road aftermarket mod.

 

[thrill]

(IMO) Those massive brakes are not just for looks. The ability to tow (and safely stop) 11,000 pounds at speed (which basically triples the weight of the vehicle) is part of the engineering decision on brake sizing. Larger rotors means more leverage, more room for larger calipers, and better heat dissipation, requiring larger wheels to package all that. The only reason to want more sidewall (by having smaller wheels) is to be able to air down more to get even more traction, and the amount you can air down is limited by sidewall strength. But tires with a higher load rating are already going to have stronger sidewalls. The Pirellis developed for Rivian have a higher silica content for just those strength reasons, and a wider tread pattern for better grip. They probably won't come cheap. Emme's desire to air down more is for better traction, I guess, but those fully independent motors, and ever improving torque control software sent OTA, will make up for that sort of performance requirement, I'd have to believe.

 

[skyote]

It never hurts to have bigger brakes, but my HD diesel truck weighs more than a Rivian, and stops like a champ with brakes that fit inside my 18" wheels. Even when pulling trailers without trailer brakes, it still has more than enough stopping power.

I definitely think that Rivians would have plenty of mechanical braking that could fit inside 18" wheels.

 

[Shzeph]

I suspect the huge brakes are as much for looks and style-points as they are for heavy duty breaking. My Range Rover also had enormous brakes, and it certainly wasn’t towing anything.

 

[jeeden]

I would also point out for long term wear. For many years a lot of suvs like grand cherokee, explorers, gmcs, etc would have the rotors warp after just a few thousand miles because if driving a styles and excessive heat buildup. It is pretty rare for rotors to get turned instead of replaced these days, but the trend in larger rotors and pads has made them hold up better. Possible rivian is going for super low maintenance here

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