20" Inch 20" Sparco Sterrato + Toyo Open Country AT EV 275/65/20 + Swap Wheel Settings

[jaywee]

Hey folks! I’ve got a Gen 1 R1S Quad and my stock 21” wheels are about to retire, so the R1S just got a fresh set of kicks. With winter creeping up in NYC, I wanted something ready for the occasional snow, good for a bit of off-roading, and still smooth on the daily commute. Thanks to all the glowing feedback here, I took the plunge on a set of Toyo Open Country A/T EV 275/65/20s.

Didn’t feel like slapping them on the stock rims, so I sprung for some Sparco Sterratos too. Oddly enough, I couldn’t find a single review or pic of anyone running these wheels on any forum. So I figured… why not be the guinea pig? And honestly, I’m loving the look. Coming from a world of modded sports cars, I’ll do anything to un-stock the ride. Early impressions: wheels are solid, and the Toyos ride like a cloud—plus they’re quieter than those Pirelli Scorpion Verdes ever were. No rubbing in sport mode or at the lowest ride height. I’ll report back after some longer upstate commutes, snow drifting in an empty Walmart lot, and maybe some off-road detours to scare off the local trail Karens.

Quick questions for the hive mind:

• Toyo or A/T folks, what tire pressure are you running for regular road use? Hunting for that magic number.
• Anyone else go from 21” to 20”? Which wheel settings did you choose? And what’s the real difference between 2022–2024 vs 2025 20” settings anyway? Same Pirelli specs last I checked.
• Also, what’s the scoop on this mysterious aftermarket option everyone keeps mentioning? Where is it hiding?

And of course—pics of the setup below

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[jfoonly]

Looks great! Those wheels are new and not even on the sparco website (mentioned in the 20" wheel thread). Tirerack has no specs either, and still limited availability. Where did you get them? Did you happen to weigh them? Or was there a spec sheet included?

Certainly choose a 20" AT setting. The OEM dark wheels are a little heavier, but does it matter in the software or is it just for some of the screen/app graphics?

 

[jaywee]

Looks great! Those wheels are new and not even on the sparco website (mentioned in the 20" wheel thread). Tirerack has no specs either, and still limited availability. Where did you get them? Did you happen to weigh them? Or was there a spec sheet included?

Certainly choose a 20" AT setting. The OEM dark wheels are a little heavier, but does it matter in the software or is it just for some of the screen/app graphics?

Thanks! I wasn’t aware these were new. I did purchased it from TireRack. It popped up as a Rivian option and there weren’t many bronze to choose from so it was an easy pick for me. I guess maybe they stocked up in NY. And yes the specs are sparse. Only specs I can gather from Tire rack are the size (20x8.5) and the offset (+48mm) both Rivian factory oem 20” wheel specs. From what I can gather the 17” Sparco Sterratos are 30lb. So a 20” I would say is approximately 35lb give or take.

 

[UnsungZero_OldTimeAdMan]

SL or LT version of the Toyo? If SL the factory 48 psi. If LT there’s different methods. Take GVWR divide by 4, add 30% margin and look up inflation chart from Toyo. The other method is to use load spec at max inflation of 80 psi and then use that ratio to calculate what psi correlates to GVWR/4+30%. In this forum, 50-55 psi seems to be common for LTs.

 

[jaywee]

SL or LT version of the Toyo? If SL the factory 48 psi. If LT there’s different methods. Take GVWR divide by 4, add 30% margin and look up inflation chart from Toyo. The other method is to use load spec at max inflation of 80 psi and then use that ratio to calculate what psi correlates to GVWR/4+30%. In this forum, 50-55 psi seems to be common for LTs.

Got it. It’s a SL. Thanks for all the info!

 

[mrodriguez]

I just put Toyo's (SL 275/65/20) on after replacing the Pirelli's at 27k miles. I have been running them at 50psi especially with the colder weather now hitting. I didn't change the wheel configuration because they are the same diameter as the Pirelli's.

 

[Skysurfer]

• Anyone else go from 21” to 20”? Which wheel settings did you choose? And what’s the real difference between 2022–2024 vs 2025 20” settings anyway? Same Pirelli specs last I checked.

I think the main difference is the 20" All-Season in the 2025 list, otherwise the other options are the same between the years.

The 2025 All-Seasons are 275/60/20, so about an inch less in diameter (33" tall versus 34" for the 275/65/20 All-Terrain options).

 

[jaywee]

I just put Toyo's (SL 275/65/20) on after replacing the Pirelli's at 27k miles. I have been running them at 50psi especially with the colder weather now hitting. I didn't change the wheel configuration because they are the same diameter as the Pirelli's.

Yeah I’m playing around 48psi and 52psi. 50psi might be the sweet spot. How you liking the Toyos so far?

 

[jaywee]

I think the main difference is the 20" All-Season in the 2025 list, otherwise the other options are the same between the years.

The 2025 All-Seasons are 275/60/20, so about an inch less in diameter (33" tall versus 34" for the 275/65/20 All-Terrain options).

Oh right! That makes sense. Thanks for the info!

 

[UnsungZero_OldTimeAdMan]

Oh right! That makes sense. Thanks for the info!

But in context of tire/wheel swap UI, the MY25-on “all season” Goodyear Territory AT is associated with that first 20” wheel design. The other factory 20” designs (AT “staples” and AT Dark”) are associated with the larger 275/65 and closest match to the SL Toyos you got.

I tend to fill my factory Pirelli ATs to 50 (cold) because of fluctuations. And slightly more efficiency. I don’t get to canyon carve often so optimum grip is not a concern. I also noticed the pressure gauge on my Speedflate 4-tire inflation kit consistently match what TPMS reports, so I go by that instead of the display at the compressor.

 

[mrodriguez]

Yeah I’m playing around 48psi and 52psi. 50psi might be the sweet spot. How you liking the Toyos so far?

So far so good. I didn't quite realize how bad the Pirelli's got. I'm ok with a louder AT tire but those were just awful. The sound was a horrible drone. I could have gotten more out of the Pirelli's but the noise was enough to make me want to pivot. The Toyo's are good so far. They look great and the noise is a fairly normal AT noise and not loud at all. That said, they are brand new still. It's hard to say on the efficiency front because the weather is dropping quite a bit now where I am. I'll need to get through at least a full year driving with all seasons to assess a true comparison. That said, I do think they have generally been more efficient in the colder weather than I was used to seeing. I've been happy with my switch so far.

 

[jaywee]

But in context of tire/wheel swap UI, the MY25-on “all season” Goodyear Territory AT is associated with that first 20” wheel design. The other factory 20” designs (AT “staples” and AT Dark”) are associated with the larger 275/65 and closest match to the SL Toyos you got.

I tend to fill my factory Pirelli ATs to 50 (cold) because of fluctuations. And slightly more efficiency. I don’t get to canyon carve often so optimum grip is not a concern. I also noticed the pressure gauge on my Speedflate 4-tire inflation kit consistently match what TPMS reports, so I go by that instead of the display at the compressor.

Yes that’s what I choose. The 20” “staples” and I found the aftermarket tire option and just set it as that and called it a day. So far the Toyos are great. Obviously with the range lost going from 21” road wheels to 20” AT kinda sucks but it’s just for winter and the occasional trails. Come summer I’ll swap back to the 21” but this time I’ll replace the pirelli’s with Michelin. Looks like I got to get myself a speedflate! Thanks for the tip.

 

[UnsungZero_OldTimeAdMan]

Yes that’s what I choose. The 20” “staples” and I found the aftermarket tire option and just set it as that and called it a day. So far the Toyos are great. Obviously with the range lost going from 21” road wheels to 20” AT kinda sucks but it’s just for winter and the occasional trails. Come summer I’ll swap back to the 21” but this time I’ll replace the pirelli’s with Michelin. Looks like I got to get myself a speedflate! Thanks for the tip.

Or Morrflate and EZ Flate. Speedflate uses standard sized brass chucks and they were just a hair too large to clear the protective circular feature around the valve stem. So I had to spend extra to swap to Morrflate’s chucks. That’s the downside. The upside is Speedflate uses coiled hoses, so they stay off the ground and don’t pick up dirt or thorns from plants. Could have gotten schrader valve extensions, which are cheap, but I felt that would make everything less convenient.

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