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

[DaveA]

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

This is for my R2 w 21s.

Sponsored

 

[windshieldfarmer]

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.

Perhaps….though it is interesting Kyle at OOS extrapolated 253 miles range at 70 mph on 21”s and Tim (Colorado guy) saw over 260 miles range at 70 mph on the 20” All Terrains. Colorado air is thinner but Tom also had to climb 2,000, the effects of such won’t be totally offset by the subsequent 2,000 decline in elevation. While counterintuitive the 20” tire wheel combination might have less drag losses relative to the 21” as speed increases. Don’t know but a side by side test would be interesting; something no one has done. I wish OOS had done that when they had the opportunity.

 

[UnsungZero_OldTimeAdMan]

Perhaps….though it is interesting Kyle at OOS extrapolated 253 miles range at 70 mph on 21”s and Tim (Colorado guy) saw over 260 miles range at 70 mph on the 20” All Terrains. Colorado air is thinner but Tom also had to climb 2,000, the effects of such won’t be totally offset by the subsequent 2,000 decline in elevation. While counterintuitive the 20” tire wheel combination might have less drag losses relative to the 21” as speed increases. Don’t know but a side by side test would be interesting; something no one has done. I wish OOS had done that when they had the opportunity.

But are their driving routes, styles/habits, ambient temp, wind, pack tempts and average speed identical? There are how many posts/threads arguing over efficiency? Still only one thing is known for certain: EPA-certified figures almost never reflect all real world results. Too many variables involved. ICE or otherwise. It’s mostly a formality for sake of governance and job security for the career paper pushers. Just drive/enjoy the cars, IMO. Better if time spent advocating and voting for charging infrastructure improvements.

 

[windblowlc]

This is for my R2 w 21s.

51 psi is the maximum tire pressure this tire could be pressurized cold. It's not the Rivian recommended pressure for the R2. 42 psi is.

 

[DaveA]

51 psi is the maximum tire pressure this tire could be pressurized cold. It's not the Rivian recommended pressure. 42 psi is.

Yes, I'm aware. This would be an experiment to see if higher psi would help range during highway driving.

 

[windblowlc]

Yes, I'm aware. This would be an experiment to see if higher psi would help range during highway driving.

Why would you want to do that even if it's for the sake of range experiment? A couple of psi higher I could understand, but at max 51 psi?

 

[ksurfier]

Tires might blow up!!

 

[blipit]

OOS of spec actually had both sets available when testing. They should have done a 20" all terrain test. Probably ran out of time.

 

[TechDad]

OOS of spec actually had both sets available when testing. They should have done a 20" all terrain test. Probably ran out of time.

Or it didn't fit their 'narrative' to get more clicks

 

[sixmile]

Kyle and Jose addressed this. The 21s were broken in but the 20’s weren’t. He said they don’t test tires that aren’t broken in. Jose said he would do a range test with the 20s after he drove back to Florida.

 

[blipit]

Or it didn't fit their 'narrative' to get more clicks

Jose's R2 came with 20 all terrain. OOS/Jose asked Rivian to provide a set of 21" wheels/tires so they could have the best possible setup for range testing...so they thought.

I just think there needs to be more testing done all around.

Sponsored