Dumb PSI question, Nitto Recon Grapplers

[SwampNut]

Yeah, definitely don't need or want the LT or 126T versions of any tires.

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[UnsungZero_OldTimeAdMan]

One thing to keep in mind if you consider LT in the future - LT tires usually have an increased # of plys in the sidewall, which translates to a stiffer ride.

And if most of driving is stop-and-go, the weight penalty (from having more material) will manifest.

 

[SwampNut]

And if most of driving is stop-and-go, the weight penalty (from having more material) will manifest.

Probably won't have any effect on an EV (well, minimal). Just like trailer weight has nearly no effect at all, only the aerodynamics.

 

[mkg3]

Hey all! I've got a set of Nitto Recon Grappler a/t 275 /65 r20. According to their site, it says max PSI is 44. I don't want to run them at max so I've had them at 40. Now that its cold every morning I get a low pressure warning from the rivian... Should I run them closer to max PSI?

The tire pressure recommendation on the vehicle is for the OE tires. The tires you bought has a max pressure at 44 psi designed to hold up to the 116/115 rating.

It's just a different design. As long as the load index is appropriate for the R1S, then run them near the max pressure as @sub posted on post #6.

It's true that, generally speaking, higher loads require higher pressure. An extreme example is the aircraft landing gear tires. They often are design to operate around 200 psi. It's all a function of the tire design. What you're noticing is the difference between Pirelli vs Nitto on their design approach on the same sized tires.

 

[UnsungZero_OldTimeAdMan]

Probably won't have any effect on an EV (well, minimal). Just like trailer weight has nearly no effect at all, only the aerodynamics.

Reports from those, in this forum, running heavy tires paint a different picture. Weight does matter. Heavier tires take more energy to spin up. There is no free lunch.

 

[SwampNut]

Reports from those, in this forum, running heavy tires paint a different picture. Weight does matter. Heavier tires take more energy to spin up. There is no free lunch.

Heavy tires also return energy via regen. The anecdotal reports are all over the place and meaningless. And I get one free lunch every other week.

 

[UnsungZero_OldTimeAdMan]

Heavy tires also return energy via regen. The anecdotal reports are all over the place and meaningless. And I get one free lunch every other week.

You do you. I see no point running heavier tires than I need to. There are more downsides to running heavier tires than there are positives... for a vehicle that spends most of its operating hours on-pavement.

 

[SwampNut]

I see no point running heavier tires than I need to.

Completely agree, in fact I almost went with under-rated tires since I’ll never use max load.

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