how much psi?
#1
how much psi?
i have 31/10.5 bfg a/ts and was wonderin what psi you guys think i should be filling. As of now i have 32 psi and i do pretty much all on road driving so i dont need to know the best for off roading but i know that i should air down some if i do. The stock psi was 25. Any help would be appreciated.
#3
Here's a good test to figure out just the right pressure.....
(stolen from lifted97ranger)
It went along the lines of driving through a puddle and seeing what type of tread you are leaving on the dry ground....then adjusting from there. The rear pressure should be lower than the front pressure. What you want, is a proper "footprint"......so your tires wear evenly.......if the outside is heavy and middle is light, add air. If the inside is heavy and outside is light, take a lil out.
The side of the tire will tell you max psi when the tire is cold. When I air down off road...I'm usually airing down to anywhere from 13-20psi. But I play in snow, rocks, and mud.
(stolen from lifted97ranger)
It went along the lines of driving through a puddle and seeing what type of tread you are leaving on the dry ground....then adjusting from there. The rear pressure should be lower than the front pressure. What you want, is a proper "footprint"......so your tires wear evenly.......if the outside is heavy and middle is light, add air. If the inside is heavy and outside is light, take a lil out.
The side of the tire will tell you max psi when the tire is cold. When I air down off road...I'm usually airing down to anywhere from 13-20psi. But I play in snow, rocks, and mud.
#4
I'd say go with 32 and just look at the wear patterns for your particular style of driving. If you see the center getting thin in the next 1000 miles then drop it 3psi and go another 1000.
btw, once you get over 32-33 psi (on a typical pass car tire), the rolling resistance from sidewall flex and tread distortion is next to nothing.
Source = Fundamentals of Vehicle Dynamics by Thomas D. Gillespie
Rich
btw, once you get over 32-33 psi (on a typical pass car tire), the rolling resistance from sidewall flex and tread distortion is next to nothing.
Source = Fundamentals of Vehicle Dynamics by Thomas D. Gillespie
Rich
#7
ford puts it up to 25psi but me and my brother(a mechanic for Toyota) thought that to be a little low and there is no uneven wear except on the outside of my tires cause i used to drive like a maniac, and by maniac i was taking this one corner near my house at around 30 to 35 getting completely sideways and counter steering. i think i will just keep it at 32psi and see if i start to notice any uneven wear. thanks for the input.
#9
I'd say go with 32 and just look at the wear patterns for your particular style of driving. If you see the center getting thin in the next 1000 miles then drop it 3psi and go another 1000.
btw, once you get over 32-33 psi (on a typical pass car tire), the rolling resistance from sidewall flex and tread distortion is next to nothing.
Source = Fundamentals of Vehicle Dynamics by Thomas D. Gillespie
Rich
btw, once you get over 32-33 psi (on a typical pass car tire), the rolling resistance from sidewall flex and tread distortion is next to nothing.
Source = Fundamentals of Vehicle Dynamics by Thomas D. Gillespie
Rich
#10
#11
Unregistered User
Posts: n/a
your tire salesman laughed all the way home that night!
lame!
take them back and make them give you the proper tires !
6 ply is more then enough for any ranger!!!!!
and even with those you should only run them at 30-35 PSI !
#13
#16
Unregistered User
Posts: n/a
Dude man your running yours at 60???? A ranger is not a 3/4 ton i run like 30 in the front and 28 in the rear and the centers still went faster than the sides 60 is wayyyy to high for a ranger and its suspension componants!
#18
#19
i run 28-31 with my bfg at's.
im running 28 right now because of the snow/ice.
it seems to grip a little better in the snow with the lower psi.
i think the lvl2's come from the factory with 30 or 31psi, its on the door sticker.
im running 8" wide rims, so who knows.
and to the guy running 60 psi and thinking the side wall pressure is what you should run... : :
im running 28 right now because of the snow/ice.
it seems to grip a little better in the snow with the lower psi.
i think the lvl2's come from the factory with 30 or 31psi, its on the door sticker.
im running 8" wide rims, so who knows.
and to the guy running 60 psi and thinking the side wall pressure is what you should run... : :
Last edited by 5speedin2.3; 02-11-2008 at 02:20 AM.
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