Tire pressure, mpg, ride quality

[erasedhammer]

What pressures are you guys running with stock tires?

Is fuel mileage increased at all with higher psi?
How about ride quality at high speeds?
How does handling change with psi?

Now that I'm on the road at 65+ I'm making sure everything is tuned to work its best at those speeds as my truck is pretty sketchy 70+ with all that wind and sheer speed.

 

[erasedhammer]

Lol no replies...

 

[MarkM]

I run about 43 psi and it rides alot better then when I had them at 50. Mine are E rated tires. I installed tire valve pressure caps that let me know if the pressure goes under 40 psi. These E rated tires still look full at 15 psi. Goodyear MT/Rs.

Mark

 

[erasedhammer]

I run about 43 psi and it rides alot better then when I had them at 50. Mine are E rated tires. I installed tire valve pressure caps that let me know if the pressure goes under 40 psi. These e rated tires still look fullat 15 psi.

Mark

Did you upgrade from D rated tires? If so do the E tires have better ride quality or nah?

 

[MarkM]

No they are stiffer for sure.

Mark

 

[ryanruck]

E Rated Goodyear MTRs. 45 rear, 40 front.

Ride quality and handling is pretty solid. Was running at the pressure on the fenders at first (25R, 20F) and handling was quite sloppy. Aired up and it firmed up nicely.

I do get a little bounce on the front driver's side corner at high speeds (right around 55) sometimes since I think that tire is very slightly out of round and it hits it's harmonic resonance just right. I speed up or slow down and it goes away.

No idea about mileage. Can't say I really pay attention to that.

 

[Sintorion]

You ride on air and the tires hold that in place. The more air, the less rolling resistance and the better your mileage. To get a good idea of the difference, ride a bike with 10psi then bump it up to 50 psi and see how much easier it is. The draw back to high pressure is that ride quality will suffer. Tires don't flex and absorb the bumps it becomes very harsh. Handling will improve with more pressure, but it can quickly go the opposite direction with too much air because you will be bouncing and feeling everything in the road. Tire pressure is a delicate balance between comfort and handling. Never go below the minimum and never go above the maximum cold pressure. Anywhere in between is fair game.

 

[juanprado]

I run baja D range on 24 bolt. 35psi front, 40 rear. Handles and rides great. First few miles I find it they are riding harder but then they warm up and no issue. My 5 ton is the same.....

I did balance them with lead weights clipped on the inside as I don't like or trust stickies. Hangup from my tire days at western auto in another lifetime.

 

[donquijote]

Baja Ds on ours... 38 front / 40 rear

Sent from my SM-N915P using Tapatalk

 

[gimpyrobb]

Why do you guys run higher pressure in the rear, do you carry a lot of weight?

 

[juanprado]

Why do you guys run higher pressure in the rear, do you carry a lot of weight?

Actually for me is a balance of sorts. On the front I added a winch, armor grills and on rear airlift bumper plus tire.

Most models on the tm show a difference from front/rear so I went with it. 5 psi is not a big difference.

 

[ryanruck]

Why do you guys run higher pressure in the rear, do you carry a lot of weight?

Sometimes...



Also the slightly higher rear pressure was recommended on the fender markings and in the TM. Plus, a bit of a habit from my work trucks/vans.


(P.S. I miss the old avatar... )

 

[Katavic918]

The higher pressure in the rear assumes that the truck is fully loaded at 2500 lbs. Its the same reason pickup trucks have higher rear tire pressures. I run the same front and back on the HMMWV. I run lower rear pressure on my pickup unless I'm hauling something.

 

[Carrera911]

30 psi all around for me. Works well on the road on the way to the trail and good enough on the trails. I don't air down on the trails because a good enough portable compressor to fill 37s is 150+ bucks.


Sent from my iPhone using Tapatalk

 

[gimpyrobb]

The higher pressure in the rear assumes that the truck is fully loaded at 2500 lbs. Its the same reason pickup trucks have higher rear tire pressures. I run the same front and back on the HMMWV. I run lower rear pressure on my pickup unless I'm hauling something.

Thats why I was wondering, I know my pickup hauls a lot, didn't figure a hmmwv would be carrying what I do

 

[someoldmoose]

Erasedhammer, Do you ever search before starting a new thread ?

For ANY vehicle ; find the correct air pressure by drawing a line across the tread from edge to edge with a tire crayon or chalk. Drive straight ahead a few tire rotations ( do not steer left or right ). Look at the line you made. If gone, pressure is right on. Outside remains ? Lower pressure and repeat check. Center remains ? Increase pressure and repeat check. This works regardless of tire size, width, or load. Obviously, overloading is dangerous at any tire pressure.

This advice applies to everything from a Smart car to a HMETT. Drive safely.

 

[NormB]

What is this "mpg" of which you speak?

Anyone know what TM or TB this is in?

 

[1 Patriot-of-many]

My HMMWV has the pressures painted on the fenders/sides. 25 rear, 20 front.

 

[someoldmoose]

Hahaha Normb ! Maybe millimeters per gallon. My 8V92 did AMAZING !

 

[erasedhammer]

Erasedhammer, Do you ever search before starting a new thread ?

For ANY vehicle ; find the correct air pressure by drawing a line across the tread from edge to edge with a tire crayon or chalk. Drive straight ahead a few tire rotations ( do not steer left or right ). Look at the line you made. If gone, pressure is right on. Outside remains ? Lower pressure and repeat check. Center remains ? Increase pressure and repeat check. This works regardless of tire size, width, or load. Obviously, overloading is dangerous at any tire pressure.

This advice applies to everything from a Smart car to a HMETT. Drive safely.

Thanks.

I've tried to used the search function before. Was not a fun experience.