Growing efficiency Gap: R2 w/ 21" vs. 20" tire sets

[ksurfier]

While anecdotal, it appears that the R2 with 20" wheels may in fact be slightly more efficient that the 21" setup. Some say that it's just the 21" crowd is driving faster, which might be true, interesting none-the-less:

As reported here: Rivian Tires: Compare & Review for R1T, R1S & R2

Tire	Miles	Vehicles	MpV	MPK	Range
20"	9184	12	765	2.74	241
21"	5579	11	507	2.53	223

Any current owners willing to report in with tire size, total mileage, average speed, and efficiency?

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[lordsutch]

That seems to be older data. Rivian Roamer is now reporting a lot more miles and vehicles, and the gap has narrowed a bit. Still the A/S 21s are running behind the A/T 20s by about 0.18 miles per kWh. https://rivianroamer.com/guides/tire-efficiency?platform=r2

 

[sparked]

That seems to be older data. Rivian Roamer is now reporting a lot more miles and vehicles, and the gap has narrowed a bit. Still the A/S 21s are running behind the A/T 20s by about 0.18 miles per kWh. https://rivianroamer.com/guides/tire-efficiency?platform=r2

Still very limited data and mileage. 21 "All Seasons have fewer miles driven than the 20" Trail Terrains which we know won't be reality in a month or two.

 

[jrmbadger]

It would be interesting to see what the efficiency could be with 20" all season tires. I know that the AT tires are sort of more of an AS/AT hybrid, but I wonder if an all season would be better.

 

[ksurfier]

Still very limited data and mileage. 21 "All Seasons have fewer miles driven than the 20" Trail Terrains which we know won't be reality in a month or two.

That seems to be older data. Rivian Roamer is now reporting a lot more miles and vehicles, and the gap has narrowed a bit. Still the A/S 21s are running behind the A/T 20s by about 0.18 miles per kWh. https://rivianroamer.com/guides/tire-efficiency?platform=r2

Thanks, looks to be holding, but may still just be some weird variables...

Tire	Miles	Vehicles	MpV	MPK	Range
20"	15429	21	735	2.73	240
21"	11594	20	580	2.55	224

 

[ksurfier]

It would be interesting to see what the efficiency could be with 20" all season tires. I know that the AT tires are sort of more of an AS/AT hybrid, but I wonder if an all season would be better.

There are some interesting 20" tires, I predict the 20" AS (likely the Nexen Roadian HTX2), but likely only improving efficiency by 1-2%…pretty much negligible…

 

[Dark-Fx]

I told my car that I'm still running the stock 21's because of my TPMS issue, seems like it might have repercussions for RR's data even though I told it I'm not running those tires/wheels anymore. My usage doesn't show up on the actual tires I have mounted on the tires page since it's not a tire that's listed on Rivian Trackr's guide (for obvious reasons I guess).

Maybe I'll swap the TPMS sensors out this weekend or something, but it's a lot of work for the sake of someone else's data.

 

[ksurfier]

I told my car that I'm still running the stock 21's because of my TPMS issue, seems like it might have repercussions for RR's data even though I told it I'm not running those tires/wheels anymore. My usage doesn't show up on the actual tires I have mounted on the tires page since it's not a tire that's listed on Rivian Trackr's guide (for obvious reasons I guess).

Maybe I'll swap the TPMS sensors out this weekend or something, but it's a lot of work for the sake of someone else's data.

That’s a great data point, those the 50# SL or the 54# LT?
….so maybe you are responsible for this efficiency gap?!?

 

[Dark-Fx]

That’s a great data point, those the 50# SL or the 54# LT?

SL. I've also had a tent and stuff on my roof for the last two weeks. Doesn't seem to be a way to differentiate that out of the data either.

 

[SeaMonkey80]

out of curiosity, has anyone checked their tire pressures on their R2s? ours was delivered with the tires lower than what was recommended, which would result in lower numbers. I have the 21s. After setting to the right pressures, efficiency has increased so far. I need more data points, but with our driving style, we are getting close to the full range.

 

[ksurfier]

SL. I've also had a tent and stuff on my roof for the last two weeks. Doesn't seem to be a way to differentiate that out of the data either.

Dark-Fx AKA “Weird R2 Variable”

 

[windshieldfarmer]

I’m guessing it doesn’t reflect average speed anywhere? That said it hard to believe the respective owners drives their car significantly differently. But who knows….

 

[windblowlc]

It's either delusional or wishful thinking to believe the 20" AT has more range efficiency than the 21" AS. Just look at the official Rivian numbers - 330 mi on 21" AS and 307 mi on 20" AT. This thread is badly conceived.

 

[DaveA]

out of curiosity, has anyone checked their tire pressures on their R2s? ours was delivered with the tires lower than what was recommended, which would result in lower numbers. I have the 21s. After setting to the right pressures, efficiency has increased so far. I need more data points, but with our driving style, we are getting close to the full range.

Mine were at 44. Let's pump em up to 51 (max psi) and see what range we can get.

 

[windblowlc]

Mine were at 44. Let's pump em up to 51 (max psi) and see what range we can get.

Your R1T tire pressures belong in another thread. I believe R2's recommended pressure is 42 psi.

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