tire PSI

[SP66]

Just dropped my PSI down to about 32 in fronts 30 in rears---tires read 65 PSI----are you guys running something like this on the road? I always have kept PSI at max suggested on the tire for cars but maybe keeping it lower on the Bronco will keep it spongy on the road bumps?

 

[sprdv1]

don't sound right to me.. most of em are gonna be that 30 - 35 range, but I could be wrong..

What tires are they..?

 

[SP66]

don't sound right to me.. most of em are gonna be that 30 - 35 range, but I could be wrong..

What tires are they..?

Cooper STT 325/60-18 sorta a 33 x 13.5

 

[70_Steve]

I'm running 35 x 12.5 x 15 KM2s and keep them between 28 and 30 psi. Any more than that and it rides too hard and gets darty. Any softer and the steering gets mushy.

 

[SP66]

I'm running 35 x 12.5 x 15 KM2s and keep them between 28 and 30 psi. Any more than that and it rides too hard and gets darty. Any softer and the steering gets mushy.

Could be my problem then, recently max aired them to 65, maybe I'll drop them a bit---PO told me he had them at 30 in front 25 in rears---don't know why the difference between front and rear

 

[68rockcrawler]

Tire pressure listed on the side of the tires is MAX pressure. I got new tires once and the shop aired them up to the max pressure and they rode horribly rough. I dropped them back down to 30 and it really smoothed out the ride.

There is a recommended tire pressure that should be listed on the door jamb of newer cars.

 

[70_Steve]

don't know why the difference between front and rear

I've always run the same pressure in the front and rear... just because... Never thought to try a lower pressure in the rear, but it might help my ride just a little. I run a soft top, so there's not much weight in the back. I do notice that the back bumps a bit harder, really noticable when going over speed bumps. Thought it was just the different shocks I had in the back, but tonight I'll try dropping the rear pressure some...

 

[Tom Dummer]

CHeck teh tire patch on the ground. chalk the tread then roll the tire. You should see all the chalk go away. otherwise you are just running the center of the tread with an over inflated tire. 25 to 30 is where mine are the most comfortable. Different manufacturers are a little different in the sidewall strength. the difference in front to rear pressure is simply pounds per square inch by weight of the vehicle. Run across a scale and see the difference from front to rear. Especially topless.

 

[motoman]

For my Goodyear Wranglers 35" I ran 32F/32R

For my Swamper SSR 37" I had to test different pressures to find the sweet spot . I have settle on 23-24F/23-24R

 

[Bronco Biff]

They are probably Load Range E tires with thick sidewalls which are much heavier than you'll ever need on the Bronco. Runnig a lower pressure won't hurt'em!

 

[FRKNSTYN]

shouldn't you be using the tire pressure suggested on the ID plate/owners manual?

 

[rustbucket]

Max tire pressure is based on what the tire can handle. Larger, heavier vehicles need a higher pressure to support that weight and and create the proper road patch. Lighter vehicles need less pressure to create the same road patch. 30/28 is a good starting point for Bronco's, but to really get the most out of the tire, Tom Dummer's suggestion is the correct method. This ensures even wear across the thread and prolongs the life of the tires.

 

[phred]

Another thing to consider when running high air pressure in tire is that as they heat up the pressure increases. If you have them air to the max cold think how high they pressure is after running down the highway at 80mph for an hour.

I run 32psi all around in my truck with 33" mtrs. 36 all around in my big bronco with 33" duratracs.

 

[SP66]

Thanks to all. Simple problem with tire pressure. Dialed it down to 30 up front 25 in back. A lot spongier and I'm staying on the road. Still not driving like a Lamborghini but its a Bronco. Gonna be awhile before I take it on 95 again. That's why I need a stocker. You hear me FLA67

 

[FRANKO289]

That's why I need a stocker. You hear me FLA67

His Tv Eb is going to cost you a "lil" and its def. not a DD !!

also try I75 first .... south of 595 its got 5-6 lanes !!! lol

 

[bronconut73]

CHeck teh tire patch on the ground. chalk the tread then roll the tire. You should see all the chalk go away. otherwise you are just running the center of the tread with an over inflated tire. 25 to 30 is where mine are the most comfortable. Different manufacturers are a little different in the sidewall strength. the difference in front to rear pressure is simply pounds per square inch by weight of the vehicle. Run across a scale and see the difference from front to rear. Especially topless.

Exactly! I have 33" BFG's and run 26 in the back and 29 in the front. That gives me a good flat tread patch and no squirrelyness on the street. Different tires will be different obviously so just experiment.
At 30+ psi I really start to notice the ride to be a little stiffer. Too low into the 20's and I can feel it getting squirrely on the street.
Ofcourse airing down off road is great since it makes the trail so much smoother and widens your foot print for better traction.
You can use the chalk method as described above or a patch of wet driveway that will cause you to leave a wet tire tread on the dry ground.
This will make it obvious if your running too much pressure.
It takes some time to narrow down the right pressure but the result is longer tread life and a much better ride!
Good luck.

 

[Skiddy]

shouldn't you be using the tire pressure suggested on the ID plate/owners manual?

yes if maybe they were stock tires;D

 

[JefeAZ]

shouldn't you be using the tire pressure suggested on the ID plate/owners manual?

~95% of Broncos arent running stock sized tires. Im at 32 psi on 31x10.50s. They look a little low on pressure but ride great

 

[fla67]

we can just swap keys when we meet

 

[chuzie]

I am forced to run 20-25 psi because of my beadlocks I wish I could run them higher because these tires are LOUD and soft as hell.