Tire pressure vs rolling circumference

malibu795

misspeelleerr
Apr 28, 2007
8,231
546
113
42
in the buckeye state
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

Active member
Sep 10, 2011
1,012
0
36
Delaware
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.

Sent from my SM-G900V using Tapatalk
 

Chevy1925

don't know sh!t about IFS
Staff member
Oct 21, 2009
21,655
5,803
113
Phoenix Az
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

misspeelleerr
Apr 28, 2007
8,231
546
113
42
in the buckeye state
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.

Sent from my SM-G900V using Tapatalk
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