20" tire recommendations

[goldburger]

Nitto Recon Grappler A/T (46#, 9.1” wide)

My truck with 21's was a paltry 2.14 m/kWh. My truck with Recon Grapplers 275/60r20 is a hysterical 1.75 m/kWh... but they look cool and I'll probably have them on my truck for years...

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[ksurfier]

You must have gotten the LT (max 80 psi) tire instead of XL (max 50 psi), if XL, should be close to the OEM 20” 2.2mi/kw…

 

[Timdb82]

As a data point. I replaced my stock 20's at about 23k miles because they got way too loud. I thought I wanted AT's, and did not want to change sizes. I decided on 275 65 20 Cooper Dicoverer AT3 XLT tires (61 lbs per Discount Tire website). I typically run conserve low ride height when driving distances. Sticking below 72mph stock tires I could eek out 2.1 Mi/KWh. New tires I struggle to get to 1.9 Mi/KWh. I've recently been looking into all season options in the stock size to try and get above the stock efficiency, but this thread has crushed my hopes of that.

 

[Supratachophobia]

As a data point. I replaced my stock 20's at about 23k miles because they got way too loud. I thought I wanted AT's, and did not want to change sizes. I decided on 275 65 20 Cooper Dicoverer AT3 XLT tires (61 lbs per Discount Tire website). I typically run conserve low ride height when driving distances. Sticking below 72mph stock tires I could eek out 2.1 Mi/KWh. New tires I struggle to get to 1.9 Mi/KWh. I've recently been looking into all season options in the stock size to try and get above the stock efficiency, but this thread has crushed my hopes of that.

Why? There are at least 2 options, possibly 3, that can get you to 2.4/2.5 miles per kw.

 

[LL75]

Why? There are at least 2 options, possibly 3, that can get you to 2.4/2.5 miles per kw.

I think most or not all 275/60/20 all seasons tires would give him better than what he has at the moment

 

[Timdb82]

Why? There are at least 2 options, possibly 3, that can get you to 2.4/2.5 miles per kw.

In the stock size? The tires that have the efficiency bennefit all look to be 275 60 20. I could be missing something though.

 

[Zorg]

Unless I am missing something, only Michelin makes AS in 34" and they don't seem to have better efficiency than stock AT

 

[dga965]

Unfortunately, most of the great efficiency numbers for AS tires are for the 33" (275/60/20) tires and may not include recalibration for the smaller size (3% difference, which in my opinion is significant when you are looking at gains in the range of 10%). It seems that for al the faults of the OEM 20" AT 34" tires, that Rivian has done a decent job efficiency wise.

 

[Condor]

The FALKEN ZIEX CT60 A/S 275/60/R20 comes in at 46 lbs, width of 8.7”, is 116H.

anyone tried it?

 

[usofrob]

This is another good option that's rated well, but it's only rated 115 load index, which is a few pounds less that the recommended.
https://www.tirerack.com/tires/tire...6HR0TCHT&vehicleSearch=false&fromCompare1=yes

 

[ksurfier]

Falken is only 600 UTQG, reviews show it being poor for efficiency so not likely a good candidate…weight not great either.

OEM 20” is only tire <50#, so no way to get a more efficient tire than that unless you drop down to 33” (275/60R20).

suspect the grabber is the clear winner, based on reports from some forum members…downside is may only last ~20-25k miles, but with the low cost and best range (330-360 miles) would likely provide best overall value…need to get more data on them…

 

[LL75]

Falken is only 600 UTQG, reviews show it being poor for efficiency so not likely a good candidate…weight not great either.

OEM 20” is only tire <50#, so no way to get a more efficient tire than that unless you drop down to 33” (275/60R20).

suspect the grabber is the clear winner, based on reports from some forum members…downside is may only last ~20-25k miles, but with the low cost and best range (330-360 miles) would likely provide best overall value…need to get more data on them…

I'm having the general grabbler hts 60 to be put on the atomic wheels monday. What psi should I run this set at?

 

[ksurfier]

Make sure it’s the XL (116 load) max 51 psi not the SL (115 load) max 44 psi. Max PSI, you could set it at 50/51 and then adjust down based on ride quality. I believe 48 is recommended, so I would keep it closer to 50 to start out. Prob. no lower than 45…so not too many options…
Usually running a couple PSI lower than recommended has a small impact on efficiency (3-5%) but can make for a better ride. Based on 48 PSI that works out to support a total weight of >10,000 lbs. Cold 48 PSI +/- 3 is where you want to be.

 

[ksurfier]

Here's another way to look at it:
Easiest to just follow Rivian's recommendation of 48 psi @ 60F (see below).
Efficiency-wise, it wont make much difference (maybe 0.1mi/kwh 44 psi vs 51 psi).
Follow these inflations for Temp (Cold overnite) (If >120F may need to bleed a tiny bit out...if below freezing prob. want to bring the pressure back up to 48-49 psi):
IF OCD, you could in theory adjust the pressure to ~49-50 every couple weeks in the AM.

46 psi​	@20F; at this point adjust to ~49
47 psi​	@40F
48 psi​	@60F
49 psi​	@80F
50 psi​	@100F
51* psi​	@120F; at this point adjust to ~49

Tires are designed to have a 10% safety factor due to changes in temperature and/or pressure.
Around 43 psi the safety factor is gone (so that's a pretty good number to stay above).
* - 51 psi is the max, but going a few psi over the max, say ~53 or so shouldn't be a problem specially if short duration (wouldn't want to have them at 55 consistently for weeks/months).

Looking forward to your report and photos of the AWs with the Grabbers, how many miles did you get out of the originals?

 

[LL75]

Here's another way to look at it:
Easiest to just follow Rivian's recommendation of 48 psi @ 60F (see below).
Efficiency-wise, it wont make much difference (maybe 0.1mi/kwh 44 psi vs 51 psi).
Follow these inflations for Temp (Cold overnite) (If >120F may need to bleed a tiny bit out...if below freezing prob. want to bring the pressure back up to 48-49 psi):
IF OCD, you could in theory adjust the pressure to ~49-50 every couple weeks in the AM.

46 psi​	@20F; at this point adjust to ~49
47 psi​	@40F
48 psi​	@60F
49 psi​	@80F
50 psi​	@100F
51* psi​	@120F; at this point adjust to ~49

Tires are designed to have a 10% safety factor due to changes in temperature and/or pressure.
Around 43 psi the safety factor is gone (so that's a pretty good number to stay above).
* - 51 psi is the max, but going a few psi over the max, say ~53 or so shouldn't be a problem specially if short duration (wouldn't want to have them at 55 consistently for weeks/months).

Looking forward to your report and photos of the AWs with the Grabbers, how many miles did you get out of the originals?

It is the XL with 116 load rating and I am having discount tires install today. Will probably running at 48 psi like the 21". The 21" lasted 16k miles with 3/32 left. Will post pics and efficiency soon. Thanks again for the detail explanation

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