20" Inch 285/70r20 Toyo ATIII EV going on R1T

[Dirtcom_AJ]

285/70r20 Toyo ATIII EV
These are about to go on the R1T. They are 35.7" x 11.5"

I've searched yes. Haven't found any Rivians running this size. If you know of anyone please let me know!

Previously

I have installed 20x10 +12 Beadlocks with low cost and heavy 295/65r20 which were way too wide and heavy, but were amazing offroad since I could drift all day and not pop a bead. However those wheels were seriously just too heavy and wide for everyday use and rubbed like crazy. Would need a 3" lift for these to be happy. Stock pirellis have almost 30k miles now and they are really loud. Worst of all they puncture extremely easy! I have a few plugs in these tires already and the last puncture I got the other week is too big to plug.

This week
These 285/70r/20 tires will be going on a 20x9 +25 wheel. Very likely I will rub on the lowest setting. I believe all these would need is a real 1" lift to be happy. Unfortunately there are no real lifts for the Rivian yet. With the common cv axle issues on these vehicles, tricking the sensors to go 1" higher really won't be good for the axles. I believe that at higher speeds normal setting height/cv angle is probably the highest you want to be. A real 1" spacer lift would be the best. Yes I have tried the sensor lift trick, no I do not recommend it especially for highway speeds, but this is the internet and that's just my opinion.

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[Phatman113]

I'm following because I'm super excited to hear how the bigger tires work for you, for efficiency and ride...

I know you're dirtcom, and you *SELL* the hitch mount, but does the larger tire even fit in the spare compartment?

thanks for being a guinea pig on this one!

 

[SeaGeo]

I've been trying to pressure a friend into mounting these so that I know not to. I guess you're my friend now!

I'm really curious to hear your opinion on them. I've been fairly tempted to give this a shot as well.

 

[Dirtcom_AJ]

Got the tires in but I have to sit and stare at them until my tire appointment on Wednesday afternoon. Tire weight comes in at 59.4 lbs (1.6 lb under 61 lb listed spec)

but does the larger tire even fit in the spare compartment?

I can definitely try to fit it once they're mounted for educational purposes. Bigger issue for me is it's a very inconvenient place for a spare. Especially when your bed is loaded up with all types of camping gear. Especially with the back breaking extended tailgate design. The beadlock 295s I wouldn't even bother. Over 100lbs would be an annoying task to lift out of that spot.

I'm really curious to hear your opinion on them. I've been fairly tempted to give this a shot as well.

We will see!. Maybe it'll be so bad that ill want to develop a 1" to 1.5" lift for the truck

Jokes aside, I really wish there was a 1" or 1.5" lift available for the Rivian to allow clearance for slightly larger tires. As we all know the truck lifts itself, but imo "standard" height is a bit too tame looking. "High" is such a better look and fit for larger tires!

 

[Riviot]

Got the tires in but I have to sit and stare at them until my tire appointment on Wednesday afternoon. Tire weight comes in at 59.4 lbs (1.6 lb under 61 lb listed spec)


I can definitely try to fit it once they're mounted for educational purposes. Bigger issue for me is it's a very inconvenient place for a spare. Especially when your bed is loaded up with all types of camping gear. Especially with the back breaking extended tailgate design. The beadlock 295s I wouldn't even bother. Over 100lbs would be an annoying task to lift out of that spot.


We will see!. Maybe it'll be so bad that ill want to develop a 1" to 1.5" lift for the truck

Jokes aside, I really wish there was a 1" or 1.5" lift available for the Rivian to allow clearance for slightly larger tires. As we all know the truck lifts itself, but imo "standard" height is a bit too tame looking. "High" is such a better look and fit for larger tires!

I forget the speed limit for off-road all terrain, if there is one, but couldn't you just leave it in that and High? I'm pretty sure I've hit 60mph on a gravel road in high...

 

[Dirtcom_AJ]

I forget the speed limit for off-road all terrain, if there is one, but couldn't you just leave it in that and High? I'm pretty sure I've hit 60mph on a gravel road in high...

I actually love Rally mode for that same purpose. I'm more worried about the all purpose on road limit that lowers the vehicle at 45mph. Basically I'd like to be able to drive the vehicle without larger tires rubbing all the time on road. I've already had my cv axles replaced. My thoughts are high mode combined with huge torque is not a great combination for the cv axles.

That's just a guess though as to why they force it to lower at 45mph (in addition to the "safety" aspect of roll overs)

 

[Polar]

Riddle me this; what EV truck is rocking that as an OEM equivalent size?

Hummer/Chevy?

There’s gotta be a specific reason why they made that size in an “EV Specific” tire

 

[Dirtcom_AJ]

Riddle me this; what EV truck is rocking that as an OEM equivalent size?

Hummer/Chevy?

There’s gotta be a specific reason why they made that size in an “EV Specific” tire

Toyo makes lots of offroad tire sizes for aftermarket purposes. Also, don't forget this would be a nice tire size for the Ford F150 Lightning EV as well!

 

[UnsungZero_OldTimeAdMan]

DCE teased a lift long ago, then clammed up.

 

[Dirtcom_AJ]

DCE teased a lift long ago, then clammed up.

DCE knew that "tricking" the factory sensors with arms or links just really wasnt the proper way to lift the vehicle and concluded with an engineering beauty. Looks like they did everything right and didn't cut corners. However, there was so much that went into it I think the final retail price would push a majority of people away (plus installation labor!) This is speculation just based on how involved the lift looked and speaking with them about all the parts involved. They had to extend lines, hydraulics, etc on top of all the spacers and brackets to drop the sub frame. Then there's the custom skid plates to accommodate the dropped subframe. Personally, as much as I dream about having that lift, reality tells me many wouldn't actually want a 3" lift for a daily driver Rivian.

 

[ksurfier]

Hadn’t considered this size since it didn’t exist, this is apparently the first tire in this size. I think with the correct rim size it may not rub, except for turns and big “bumps”. I would avoid it since it’s over 60#, however I think it will look good…better match it with some sliders/running boards…

 

[Dirtcom_AJ]

HERE THEY ARE!
Tires: 285/70r20 Toyo AT3 EV
Wheels: 20x9 +20mm

Quick Notes on Vehicle Mods
My Wheels vs Stock 20x8.5 +48
Front aero flap cut on lower bumper
Suspension ~1" over factory settings

My wheels push the tire out .25" (half wheel width difference) + 1.10" (offset difference)= 1.35" out compared to factory wheels. I am running a fairly aggressive wheel setup and suspension is about 1" over stock height. Even with these wheels they are clearing the plastic fender wells at full lock. The outer edge of my tires at full lock barely touch the fender lining, but it's not enough to make an audible sound. Which means in the parking lot I don't get embarrassing rubbing sounds when I park. That is actually great news for anyone running a less aggressive fitting wheel. The diameter of these tires are most likely the max that the stock fenders can handle clearance wise. This means a less aggressive wheel setup will definitely clear. The narrower profile of this tire is definitely a plus! Again the caveat is I am 1" over standard heights.

I did run on low conserve setting on the highway and I made it back without rubbing, but I'm certain that any hard bumps or aggressive turns my tires will rub at the center of the fender flare (top) due to my wheels sticking out so far.

FULL DROOP Suspension fully extended on jack (pass. rear pictured below) Most likely I may have to cut the aero flap if it becomes annoying offroad, but this would never touch in street driving.

FACTORY "STANDARD" HEIGHT Pictured below shows front wheel at factory standard suspension height.

RANGE EFFICIENCY
WHEELS- The 20x9 Aftermarket wheels weigh almost the same as factory wheels. I have measured the factory wheels at 38.8 lbs. The aftermarket wheels are listed at 39.5 lbs. They would only make a difference due to aerodynamics of sticking out, and not so much weight.

TIRES- The factory Pirelli are 48 lbs. The Toyo are 11 lbs heavier. This weight and the larger diameter will have the biggest impact on range.

However, the more complicated question, because I overthink everything... How accurate will the mi/kwh be? Does Rivian get this by miles driven vs battery percentage or is there more to it. If that is the case I would need to multiply the number by 1.047 (diameter difference) so a 2 mi/kWh reading is actually 2.1 mi/kWh. Anyway, to get a more accurate range difference I would need to report back after driving a few hundred miles for a fair comparison. There are too many factors on short drives.

PREVIOUS EFFICIENCY ON FACTORY PIRELLI for future reference
Trip A- 1.76 mi/kWh at 12,081 miles driven. (Current odometer is 32,441 miles)

 

[ksurfier]

Yes, to correct your MPK, add 5%. To correct your speed, also add 5% (speedo reads 62 mph, actual speed is 65 mph). Your odo may under report miles too by 5%, so 62 miles on odo is really 65…
Since speedo overestimates by 2 mph, yours may only overestimate by 1-2 mph…

 

[Dirtcom_AJ]

yours may only overestimate by 1-2 mph…

Yup! you are correct, based on Google gps it was only off 2 mph at 70mph. I guess I was more thinking that maybe RIvian has other factors involved in their calculation. Especially considering the way the navigation adds factors into its range calculation. It is often never an equal comparison when you look at displayed battery and range vs calculated battery and range on navigation.

Here are more pictures

edit- I'd like to add that the wheel design makes the tires look fatter and taller. On a wheel design where there is no lip, and/or spokes go to the edge of the wheel, the tires will appear less "meaty"

 

[Phatman113]

I am running a fairly aggressive wheel setup and suspension is about 1" over stock height.

Tell me more about this mysterious 1"...

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