Tested 35" tires on the R1T - for offroading / overlanding

[ksurfier]

Only point is that you can get 99.99% the same tire and save a lot of weight…it’s an EV after all and avoiding the heaviest tires is always good from a handling and performance perspective, that’s why all OEM tires and between 35-50 pounds.
Some people are actually getting the on road tires which can net nearly 3 mi/kwh.
Best of both worlds is having two sets, one off road set in mid 50#s and on road set in high 30 to low 40#s, to each their own, but I would definitely want max range when going adventure/offroading…

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[Desiboy]

Has anyone fit 35’s on the oem 20’s?
35x11.5x20 or 295/65/20. Looking for more off road ability and not really cocorned with range as I have a second set of the factory 21’s. The factory 20’s are all beat up after 2 off road trips with little tears in the sidewalls.

I have 285/65/20 BFG KO2s on my wheels. have had them for 8 months or so, do some offroading, accessing remote hiking trailheads, slight hit with range but have not experienced any rubbing.
Not sure of the 295/65/20.

 

[Desiboy]

Only point is that you can get 99.99% the same tire and save a lot of weight…it’s an EV after all and avoiding the heaviest tires is always good from a handling and performance perspective, that’s why all OEM tires and between 35-50 pounds.
Some people are actually getting the on road tires which can net nearly 3 mi/kwh.
Best of both worlds is having two sets, one off road set in mid 50#s and on road set in high 30 to low 40#s, to each their own, but I would definitely want max range when going adventure/offroading…

I did that with my LR4, gets tiresome quickly, settled on 33" KO2s all the time for that as well.

 

[Si.LE.R1S]

@Rexbo

Have the Ram 2363 wheels (same +18 offset as OP, but 8” wide) and picking tires.

Looking at Open Country 35” 11.5” 20 (nearly 295/65/r20). My plan is to use these exclusively for off road (standard or snow mode to get to trailhead, then rally/all-terrain/rock crawl). I’ll switch back to 22” for daily and road trips.

I’ve been using the
20” ATs, but there is simply not enough sidewall to protect the wheels.

Has anyone tried this tire size with the Rams or Hellcat and can definitely say it’s no go? Should I just play it safe and go 285?

 

[krockett]

For the register…

I’m running Hankook Dynapro AT2 Xtreme 285/60/20s on 20x9” +40 Atomic Wheels. No rubbing on lowest and softest setting.

 

[SDRivian]

@Rexbo

Have the Ram 2363 wheels (same +18 offset as OP, but 8” wide) and picking tires.

Looking at Open Country 35” 11.5” 20 (nearly 295/65/r20). My plan is to use these exclusively for off road (standard or snow mode to get to trailhead, then rally/all-terrain/rock crawl). I’ll switch back to 22” for daily and road trips.

I’ve been using the
20” ATs, but there is simply not enough sidewall to protect the wheels.

Has anyone tried this tire size with the Rams or Hellcat and can definitely say it’s no go? Should I just play it safe and go 285?

I think 285/65/20 is the limit for Rivian with zero/minimal rubbing (until aftermarket fenders come along like Jeeps). 295 would be pushing it...it would certainty rub in standard. Even if you use your Rivian almost exclusively for tails and off roading you still have to drive to the trails and back and the the suspension defaults to standard ride height at speed.

 

[kongzero32]

Sorry @Rexbo, but I had to copy you. Just looked too good. Here is my R1T with 20x9 +18 wheel and stock Perelli all terrains.
The only rubbing I have seen is on low during medium-ish bumps. I have found not using the soft ride setting helps however.

 

[Si.LE.R1S]

@Rexbo have one entry to add.
Ram 2363 20x8” wheels
Toyo Open Country LT295/60 R/T ~50% tread

No rubbing at standard height/stiff suspension on bumps or with full lock. I was able to make it rub once in soft suspension over a decent bump, so it’s possible there could be rubbing in stiff mode if the treads were new as it’s probably pretty close.

I consider this a very specialized setup just for off roading though as the efficiency tanked to 1.8-1.9 @ 65 PSI. It could also be run in Rally mode to the trail head to avoid any chance of rubbing.

Anyone who wants to try this setup should keep in mind that airing up takes a long time to go from 30 psi to 65-70 psi with the small on board compressor (5-6 minutes per tire). Unfortunately, the only other option is to get a tank compressor for a faster option unless you’re willing to schlep along a 12 volt to power a true off roading inflator. The 8” rim and the 295mm/11.6” tire is supposed to hold the bead really well at even lower psi
I want to take it down to 20-25 psi, but the thought of airing back up is nauseating?. - may 30 psi is low enough. ??‍

 

[riviak]

Great thread and table @Rexbo ! I'm getting K03s to optimize R1S trail use here in Utah. I was going to get 285/65/20 but 295/65/20s are actually cheaper at discount tire and would be preferred if rubbing is none/minimal. Anyone have real life experience with 295 K03s? Standard OEM 20" AT wheels, never drive in low and no real road tripping.

 

[RivianRunner]

Anyone who wants to try this setup should keep in mind that airing up takes a long time to go from 30 psi to 65-70 psi with the small on board compressor (5-6 minutes per tire). Unfortunately, the only other option is to get a tank compressor for a faster option unless you’re willing to schlep along a 12 volt to power a true off roading inflator. The 8” rim and the 295mm/11.6” tire is supposed to hold the bead really well at even lower psi
I want to take it down to 20-25 psi, but the thought of airing back up is nauseating?. - may 30 psi is low enough. ??‍

A tank is not really of any benefit for airing tires up. The tires act as the tank. The best way to get short air up times is to fill all tires simultaneously. That's because the Shrader tire valve was designed over a century ago when tires had very low volumes, the valve simply can't pass enough air to fill large tires in a reasonable amount of time.

I use the MorrFlate hoses to fill all my 35" Cybertruck tires simultaneously in about 4 minutes total using this inflator:

Works great. A tank would just slow it down and decrease efficiency.

 

[mkhuffman]

A tank is not really of any benefit for airing tires up. The tires act as the tank. The best way to get short air up times is to fill all tires simultaneously. That's because the Shrader tire valve was designed over a century ago when tires had very low volumes, the valve simply can't pass enough air to fill large tires in a reasonable amount of time.

I use the MorrFlate hoses to fill all my 35" Cybertruck tires simultaneously in about 4 minutes total using this inflator:

Works great. A tank would just slow it down and decrease efficiency.

So how does the pump know all four tires are at the correct pressure if all four are connected together? Is that something you have to adjust after filling to the target?

 

[EVnewb]

So how does the pump know all four tires are at the correct pressure if all four are connected together? Is that something you have to adjust after filling to the target?

All four tires are connected to the pump at the same time. It’s one airline with four chucks spaced along it. The airline then plugs into the air output in the bed of the truck, or a separate pump like @RivianRunner has. Since they’re all connected together by the air hose, the psi of all four tires equalizes as they essentially become one big tire in a matter of speaking. Then when you start adding air, all of the tires air up at the same time and to the same psi. It’s actually a pretty great way to do it.

 

[Rexbo]

So how does the pump know all four tires are at the correct pressure if all four are connected together? Is that something you have to adjust after filling to the target?

SCIENCE!

 

[Brewbud]

All four tires are connected to the pump at the same time. It’s one airline with four chucks spaced along it. The airline then plugs into the air output in the bed of the truck, or a separate pump like @RivianRunner has. Since they’re all connected together by the air hose, the psi of all four tires equalizes as they essentially become one big tire in a matter of speaking. Then when you start adding air, all of the tires air up at the same time and to the same psi. It’s actually a pretty great way to do it.

I have a system I made myself. It works great but one of the hoses is longer. The increased resistance of the longer hose will cause the tire connected to it to have a little less psi if I don't give the system 10 -15 seconds to balance out after filling. I made mine for filling two tires at a time since until I bought my R1T I never ran the same pressures front and rear. A digital pressure gauge connects to the Schrader valve. Or you can use the Schrader to fill from a gas station hose if needed.

 

[riviak]

Here’s 285/65/20 KO3s mounted, in case anyone has interest. Liking them. No rubbing in any height mode. Much quieter than stock Pirellis. I’ll have to leave the efficiency/range nerd out to the Youtubers, since I charge for free and do not road trip. Here is the only data I have, which is Trip A with BFGs and Trip B everything before on stock Pirellis. Quad launch edition R1T. Running 50 PSI on both sets of tires.

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