Tire pressure vs rolling circumference

[malibu795]

Won't matter. If it changes mph 1-2 by just a few pounds like Adam was saying, a tire that flat should make it very visible.

Like I've said, I've gps verified my tracker at 30psi and 8 psi and there is no difference in mph at speed.

Post 33? Quoted Goodyear (educated gues talking about a 40" tire) over course of a mile role out distance was 13' with a 5% psi difference.. that's 600 or so revolutions to a mile... 1-2 revolutions and a thumb/eyeball isn't going to pick the difference up..

Basically what I gathered is they, good year, took tire X loaded it and set 100psi and knowing 5280' is 600 revolutions.. verified it. then dropped psi 5% or 5psi from 100psi, in the same tire, went 600 revolutions again and came up 13' short of 5280'

Most GPS especially civilian are not that accurate

 

[CaptPhil]

Post 33? Quoted Goodyear (educated gues talking about a 40" tire) over course of a mile role out distance was 13' with a 5% psi difference.. that's 600 or so revolutions to a mile... 1-2 revolutions and a thumb/eyeball isn't going to pick the difference up..

Basically what I gathered is they, good year, took tire X loaded it and set 100psi and knowing 5280' is 600 revolutions.. verified it. then dropped psi 5% or 5psi from 100psi, in the same tire, went 600 revolutions again and came up 13' short of 5280'

Most GPS especially civilian are not that accurate

That is 0.2% difference. Quite negligible.

That is only 123 miles over 50,000. Your tires are going to see much larger travel distance difference from just turning.

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[Chevy1925]

Post 33? Quoted Goodyear (educated gues talking about a 40" tire) over course of a mile role out distance was 13' with a 5% psi difference.. that's 600 or so revolutions to a mile... 1-2 revolutions and a thumb/eyeball isn't going to pick the difference up..



Basically what I gathered is they, good year, took tire X loaded it and set 100psi and knowing 5280' is 600 revolutions.. verified it. then dropped psi 5% or 5psi from 100psi, in the same tire, went 600 revolutions again and came up 13' short of 5280'



Most GPS especially civilian are not that accurate

30 psi to 8 psi is a heck of a lot bigger difference than 100 to 95. If the difference is that noticeable, a 23psi change will for sure show on a gps at 60 mph and 30mph over 10 miles. This is based on vss read via the obd2 port vs my phone gps and my garmin gps.

If I get time this weekend while we wheel, I'll take pics/video and show ya.

 

[malibu795]

That is 0.2% difference. Quite negligible.

That is only 123 miles over 50,000. Your tires are going to see much larger travel distance difference from just turning.

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True... though turning has open differential to allow differences..
unlike hard connected setup like a dually wheel setup or spooled axle there is no give for differences sooner or later the smaller tire Will hop