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Those with 285/70/17 BFG AT KO's

camshaft

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camshaft Enthusiast

camshaft

Posted
Posted

According to the BFG site, they indicate pressure at 65psi. Is this not way extreme? I am on my way to get my new tires installed (hopefully they dont rub with 1.5" of torsion bar crank), but was likely going to tell the tire shop to inflate with about 45 psi.

 

What do most guys run? BTW this is on a 05 GMC crew 1/2 ton. I dont do any real off-roading and winter is upon me (at least in my city)

 

Any suggestions would be great

 

Thx

Shawn T Enthusiast

Shawn T

Posted
Posted

42 psi on all corners. Any more than 50 and it will feel like you are riding on rocks. Keep in mind I have an HD with the Duramax up front. This is my fourth set of BFG's and I have experimented with the pressure, and found that 42 (on my truck) is perfect for wear, traction, fuel mileage(rolling resistance) and ride. Keep in mind if you go too low that the tires will heat up and wear pre-maturely. On another note, I rotate every 6000 miles (with good front end alignment) and they seem to be equally worn out at about 60K miles.

Machine Enthusiast

Machine

Posted
Posted

I have that exact size on my Z71 Sub...37psi. The ride and wear is perfect. I rotate every 5K

 

Don't pay attention to the numbers on the door. Those #'s are for the factory tires that came on the vehicle. If i followed what my door says - my BFG's would be running 30psi.

camshaft Enthusiast

camshaft

Posted
  • Author
Posted

thx guys

 

The tire shop inflated them all to 35psi. I bumped it up to 40psi. I will see how they wear at that pressure. I may bump up to 45 in a while.

 

Other that that, I love the tires. I raised the bars about 1.5" to level the truck and with the combination of the tires, I like the stance much better now.

 

thx again

BlueTahoe Enthusiast

BlueTahoe

Posted
Posted

I have 285/75/16 and run 38-40 psi. I toyed around but this seemed to give me the best overall ride and wear. On a truck you might be able to drop the rear psi a little if you aren't carrying a load.

BRZ71 Enthusiast

BRZ71

Posted
Posted

I have cooper 285 75 16

 

Tire store put them at 35

 

I put them at 40 front 40 rear. Rides better, rear could be a little lower unloaded.

camshaft Enthusiast

camshaft

Posted
  • Author
Posted

If I rotate them religiously every 8000km (approx 5000 miles), do u think 40psi all the way round is too high. Or should I go down a few?

 

I obviously dont want to start cupping the tire.

 

thx again

topo4u2 Enthusiast

topo4u2

Posted
Posted

You guys that moved up a size on your trucks from 265 to 285.....did you have speedo recalibrated or just left it? And what was the cost to do it?

 

Cheers

BlueTahoe Enthusiast

BlueTahoe

Posted
Posted

Got my speedo fixed up with the Wester's tune. I don't think it would be off too far on the trucks. Mine was off around 7% but I was going from 265/70 to 285/75. I think the trucks get 265/75 from stock so they won't be off quite as much.

Graembo Enthusiast

Graembo

Posted
Posted

I just got mine put on Monday, 285 KO's. They fit just fine without crankin the bars (i like my ball joints the way they are :cheers: ) I had it done at a dealer by a buddy so he didnt charge to recalibrate the BCM. I was just gonna deal with the speedo dofference but apparently the recalibration for different size will also have an effect on the operation of the ABS! Had the speed sensor recall done at the same time. I've got em aired up to 42F/48R thats what i had my old burban set to so I'll see how they want to wear. And yes rotate them every 6K at least.

 

Dayyum they're fiiiiine....might not be too embarrassed to post a pic now.( :( GM OE rubber)

 

G...out

robot225 Enthusiast

robot225

Posted
Posted

I'm running 50 all around in mine. Don't think it rides rough, stiff bit not rough. They seem a but poochy unless they're at 55, but it is too rough for me at 55.

Mertz Enthusiast

Mertz

Posted
Posted
I'm running 50 all around in mine.  Don't think it rides rough, stiff bit not rough.  They seem a but poochy unless they're at 55, but it is too rough for me at 55.

 

 

 

 

robot-

 

Did you crank up your t-bars on your truck too with the 285's? Looks like it still has a little rake to it. Black with the blackwalls out looks mighty fine on your rig!! :dupe:

robot225 Enthusiast

robot225

Posted
Posted
Did you crank up your t-bars on your truck too with the 285's? Looks like it still has a little rake to it. Black with the blackwalls out looks mighty fine on your rig!!  :dupe:

 

 

 

 

 

Nope, t-bars are stock, everything is stock and no rubbing.

 

And thanks, i like the black walls too.

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