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re: Tire pressure and mpg for offroad tires.

Posted on 5/21/14 at 10:38 am to
Posted by DownshiftAndFloorIt
Here
Member since Jan 2011
66763 posts
Posted on 5/21/14 at 10:38 am to
The lesser of the two provided they are reasonably close.

I think my tires are 35max and the door sticker is 42 max or something like that. Obviously I use the tire rating.
Posted by Chad504boy
4 posts
Member since Feb 2005
166502 posts
Posted on 5/21/14 at 10:38 am to
my stock michelin's require 65 psi.
Posted by Hammertime
Will trade dowsing rod for titties
Member since Jan 2012
43030 posts
Posted on 5/21/14 at 10:45 am to
Draw a line of chalk across the tread. Drive straight down the street for 1/2 mile or so. Look at what part wore off. If outside, put more pressure. If middle, less pressure.

Should be around 30psi, but with different tires than stock, you have to do what I said. The door will not be correct, but close. The tires rating is max psi
Posted by TexasTiger01
Lake Houston
Member since Nov 2013
3215 posts
Posted on 5/21/14 at 10:51 am to
quote:

my stock michelin's require 65 psi


Not quite, alot of people misunderstand the load rating on side of the tire. They are tested with 65PSI and rated for the stated load at that PSI. Unless you're running 10 ply tires and hauling heavy loads often you should not run this much pressure. IF you are running 65, drop it to 35 and it will feel like a new Cadillac!!!
Posted by swanny297
NELA
Member since Oct 2013
2189 posts
Posted on 5/21/14 at 10:54 am to
quote:

my stock michelin's require 65 psi


That is max tire pressure - what they require is on a sticker on the drivers door or door frame
Posted by Chad504boy
4 posts
Member since Feb 2005
166502 posts
Posted on 5/21/14 at 10:57 am to
quote:

what they require is on a sticker on the drivers door or door frame



pretty sure its 65 there too.
Posted by NYCAuburn
TD Platinum Membership/SECr Sheriff
Member since Feb 2011
57002 posts
Posted on 5/21/14 at 10:58 am to
quote:

Draw a line of chalk across the tread


This, use the chalk trick, every tire is different as far as correct PSI
Posted by Chad504boy
4 posts
Member since Feb 2005
166502 posts
Posted on 5/21/14 at 10:58 am to
quote:

This, use the chalk trick, every tire is different as far as correct PSI


every road is different too.
Posted by Hammertime
Will trade dowsing rod for titties
Member since Jan 2012
43030 posts
Posted on 5/21/14 at 11:07 am to
quote:

every road is different too
explain how air doesn't move please
Posted by Chad504boy
4 posts
Member since Feb 2005
166502 posts
Posted on 5/21/14 at 11:13 am to
quote:

explain how air doesn't move please


i'm not a tire nor a genius. wouldn't the curvature nature of a road affect the wear on the tire on a simple straight line chalk test?
Posted by TexasTiger01
Lake Houston
Member since Nov 2013
3215 posts
Posted on 5/21/14 at 11:13 am to
quote:

This, use the chalk trick, every tire is different as far as correct PSI


Hell, I take my truck to the locar NASCAR track and run a few hot laps then pull the temp gun and take temps across the tire to check my contact patch....
Posted by DownSouthDave
Beau, Bro, Baw
Member since Jan 2013
7386 posts
Posted on 5/21/14 at 11:15 am to
That looks like a pretty great trip, if you're driving. I don't think I could ride shotgun bouncing around for 8 days.
Posted by Hammertime
Will trade dowsing rod for titties
Member since Jan 2012
43030 posts
Posted on 5/21/14 at 11:21 am to
Obviously you wouldn't do the chalk thing on a Nascar curve, but the amount that the downward force of each side moves respective to the banking/tire rolling down is insignificant when you are driving(once properly inflated)......if that makes any sense.

In general, the tire will wear properly when inflated properly. If you overinflate, it will be noticeable after 5k. Under-inflation will also be noticeable. If you drive straight under-inflated, the outsides will wear evenly more than the middle. If you turn fast and a lot under-inflated, the edges of the tire will wear more
Posted by Crawdaddy
Slidell. The jewel of Louisiana
Member since Sep 2006
18403 posts
Posted on 5/21/14 at 11:46 am to
running 30 psi in my BFG Km2
Posted by Geauxtiga
No man's land
Member since Jan 2008
34377 posts
Posted on 5/21/14 at 1:08 pm to
People who own vehicles like that shouldn't worry about gas mileage.
Posted by CBDTigerFan
Member since Mar 2009
2214 posts
Posted on 5/21/14 at 1:15 pm to
Why in the frick did you get e class tires on a power wheels truck
Posted by Raz4back
Member since Mar 2011
3950 posts
Posted on 5/21/14 at 1:16 pm to
How much weight have you added to your truck? Is your roof rack making that much of a difference, because 14MPG is horrible mileage in a Tacoma. Even running ATZs in 33x12.50 I got 17 in my 08. My 12 gets 18.5-19 with 255/75 Trail Grapplers and they are heavy as hell.

To answer your question I ran 42lbs in my 08 with E rated tires.
This post was edited on 5/21/14 at 1:19 pm
Posted by Gaston
Dirty Coast
Member since Aug 2008
39062 posts
Posted on 5/21/14 at 1:34 pm to
I'm worried about range more than money. 14mpgs is 250 miles a tank, 300 would allow for less stops on our road trip out west.
Posted by Gaston
Dirty Coast
Member since Aug 2008
39062 posts
Posted on 5/21/14 at 1:36 pm to
4x4? The manual transmission is shite for mileage as well, but yea the roof rack can't be good for mileage. I don't think I ever got 16 though.
Posted by Chad504boy
4 posts
Member since Feb 2005
166502 posts
Posted on 5/21/14 at 1:42 pm to
quote:

The manual transmission is shite for mileage as well, but yea the roof rack can't be good for mileage. I don't think I ever got 16 though.



do you keep the truck in toy haul all the time?
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