Scorpion AS+ tire swap (from 20" Scorpion AT) - WOW big difference

[anthonysfl]

For my 20s AT ? I run the recommended 48 psi

but I’m using the stock 20 tires too

Sorry I meant 20’s on the AS 275/60/20 tires from Pirelli.

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[Riviot]

What Psi are you running on your 20’s with AS tires?

48 on the AS as well, max is 51 like the ATs. Smooth as butter ?

 

[anthonysfl]

48 on the AS as well, max is 51 like the ATs. Smooth as butter ?

Ok sweet, I’m at 48 too.

I saw awesome efficiency last weekend driving on 95 S. 2.73 on highway. Will post official numbers with a longer trip in a few weeks.

 

[goldburger]

Ok sweet, I’m at 48 too.

I saw awesome efficiency last weekend driving on 95 S. 2.73 on highway. Will post official numbers with a longer trip in a few weeks.

Did you make your wheels two tone?

 

[goldburger]

ALSO. Tire Rack has this Pirelli AS+3 tire listed at 38lbs and Discount/America's Tire has it listed at 51lbs who knows the truth?

 

[brij patel]

guys i am thinking to switch from 22's..can someone tell me is it worth it to go with 20's with A/S tires? will it be better range?

 

[Riviot]

guys i am thinking to switch from 22's..can someone tell me is it worth it to go with 20's with A/S tires? will it be better range?

Yes. Yes.

 

[anthonysfl]

guys i am thinking to switch from 22's..can someone tell me is it worth it to go with 20's with A/S tires? will it be better range?

Yes.

 

[ILLCOMM]

Thanks to all contributing to this thread. I much preferred the look of the 20" with A/T, but also had read about the lack of options in 21". My experience with Tesla helped me understand 22" would be a meaningful reduction of efficiency and thus range.

It is great to know there are A/S (all-season) options that take advantage of the light 20" wheel.

I think we'll probably run A/S for most of the year and swap in snow-rated tires for a few months in the winter.

I do find it annoying that to "calibrate" the truck's systems to a different tire size the dealer needs to get involved. Our MS has an option in settings that allows for this to be adjusted on the fly.

Anyway, I wanted to summarize what's in this thread (to date) as it relates to A/S options to make things easier for newcomers to the thread (like me!):

Brand	Tire	Size	Notes
Pirelli	*OEM* Scorpion A/T Plus	275/65 R20 (116H)	link
Falken	Ziex CT60 A/S	275/60 R20 (116H)	link
Nokian	One H/T	275/65 R20	link
Pirelli	AS 3 Plus A/T	275/60 R20 (115H)	link
Michelin	Defender LTX M/S	275/60 R20 (116H)	link
General	GRABBER HTS 60	275/60 R20 (116T)	link
Continental	TERRAINCONTACT H/T	275/65 R20 (115H)	link

(I have no personal experience with any of these yet, nor endorse any tire listed, simply listing potential options that have been mentioned)

This link is a tool that helps you see the difference in tire dimensions (e.g., diameter) that can drive speedometer error: https://tiresize.com/comparison/

Ultimately, energy is energy, but the bigger the difference from OEM sizing, the more error in the truck's systems (speed, efficiency, range estimate, etc). If the difference is substantial, systems like traction control and drive modes could also be affected.

 

[goldburger]

I think we'll probably run A/S for most of the year and swap in snow-rated tires for a few months in the winter.

I do find it annoying that to "calibrate" the truck's systems to a different tire size the dealer needs to get involved. Our MS has an option in settings that allows for this to be adjusted on the fly.

Why can't you get snow tires in the same tire size?

 

[mkhuffman]

This is contrary to what others have posted in the thread, but I think it is likely a 275/65 R20 A/S will have better highway efficiency than the 275/60 R20 of the same brand.

I agree the 65 tire is heavier, so it will take more energy to accelerate. But some of that energy is recaptured with regeneration as the truck slows. So if the route contains a lot of slowing down and accelerating, you could see less range with the 65s. However, I bet it would get lost in the noise.

To me, it is highway range that is most important. At highway speeds, wheel rotational resistance can be significant. The sidewall is perfectly smooth, and the 65s will have lower rotational resistance at high speeds because the rim isn't as close to the ground as in the 60s, which means it is spinning a little slower at the same highway speed (as indicated in the speedometer being off by a few mph with the 60s).

Wheel weight makes no difference at steady state speeds, so the main factor is air resistance. Rotational resistance is definitely better with the 65s, but since the tire is taller, it will have more surface area on the front to push through the air. Of course it is sheltered by the car's body, so I bet the impact is less than the gain from lower rotational resistance.

Rolling resistance is probably the biggest factor anyway. So just going to an A/S from the AT tire is significant. I think Installing a 65 tire designed for low rolling resistance will give the best efficiency improvement. If there is such a thing.

 

[anthonysfl]

does anyone think we could even see better performance from the 20 inch AS setup with this tire from Hankook? It’s not as good as the Pirelli AS 3 but it is electric vehicle tuned.

https://www.tirerack.com/tires/tire...R0RF11V2&vehicleSearch=false&fromCompare1=yes

 

[Riviot]

does anyone think we could even see better performance from the 20 inch AS setup with this tire from Hankook? It’s not as good as the Pirelli AS 3 but it is electric vehicle tuned.

https://www.tirerack.com/tires/tire...R0RF11V2&vehicleSearch=false&fromCompare1=yes

Throw some on your rig and give us before/after consumption.

 

[anthonysfl]

Throw some on your rig and give us before/after consumption.

I already put on the Pirellis. I’ll consider these when it’s time to replace.
I drove a 160 mile trip over the weekend with my R1S and saw 2.24 mi/kWh with average speed of 68mph.
the best I had with my R1T on 21’s for that same trip was 2.2 mi/kW, avg speed 70mph.
I’ll take that with the S considering the S is not as aerodynamic and I have running boards and mudflaps on the S compared to my T.

 

[Riviot]

I already put on the Pirellis. I’ll consider these when it’s time to replace.
I drove a 160 mile trip over the weekend with my R1S and saw 2.24 mi/kWh with average speed of 68mph.
the best I had with my R1T on 21’s for that same trip was 2.2 mi/kW, avg speed 70mph.
I’ll take that with the S considering the S is not as aerodynamic and I have running boards and mudflaps on the S compared to my T.

You can't compare those two, every vehicle is different. Even if I tricked my R1T out the same way as yours, we'll get different consumption on the same drive. For true improvement numbers, you need the exact same rig with nearly identical road conditions.

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