Tire Pressure
Senior Member
Joined: Dec 2009
Posts: 102
Likes: 1
From: Texas
yes, you got it right ratatat. 34.97 and 25.5 psi.
With that pressure the tires will wear evenly, now remember when you add a load, bump them up. Heat maybe an issue running at 26 psi Run them down the hiway for awhile and feel the tires. Compare the fronts to the backs to see if the heat level is the same. Heat is what kills a tire. Flexing the side wall at hiway speeds heats a tire but it is pressured correctly and not stressed. It is better to run 26 psi empty than a heavy load with 80 psi.
Rob/HBT
With that pressure the tires will wear evenly, now remember when you add a load, bump them up. Heat maybe an issue running at 26 psi Run them down the hiway for awhile and feel the tires. Compare the fronts to the backs to see if the heat level is the same. Heat is what kills a tire. Flexing the side wall at hiway speeds heats a tire but it is pressured correctly and not stressed. It is better to run 26 psi empty than a heavy load with 80 psi.
Rob/HBT
Jes/Ratatat
Senior Member
Joined: Nov 2009
Posts: 239
Likes: 8
From: Alberta Canada
Tire wear happens quick and once it is there it is hard to correct it.
I lowered my 2001 7700 in the front via the torsion bars so the truck would run level with the 5th wheel hooked up. The only problem was I didn't get it re-aligned, what can 2-1/2" do right???? WRONG!!!! The tires wore on the edge and ended up cupping. I rotated them to the back but the cupping and now vibration is still in the tire. I have about 50,000KMs on these Wrangler RT/S 8 ply and the edges are wore/cupped and now cause a shimmy at hiway speeds. Tried rebalancing them but it is still there. Tires have about 60-65% left
.
I have a set of new RT/S all new spares from the 7700's cause the tire is discontinued, yes I love the tire
You are more then welcome for the info
. Money for tires is $$$$$ and trying to make them last, saves you in the long run.
Rob/HBT
I lowered my 2001 7700 in the front via the torsion bars so the truck would run level with the 5th wheel hooked up. The only problem was I didn't get it re-aligned, what can 2-1/2" do right???? WRONG!!!! The tires wore on the edge and ended up cupping. I rotated them to the back but the cupping and now vibration is still in the tire. I have about 50,000KMs on these Wrangler RT/S 8 ply and the edges are wore/cupped and now cause a shimmy at hiway speeds. Tried rebalancing them but it is still there. Tires have about 60-65% left
. I have a set of new RT/S all new spares from the 7700's cause the tire is discontinued, yes I love the tire
You are more then welcome for the info
. Money for tires is $$$$$ and trying to make them last, saves you in the long run.Rob/HBT
Senior Member
Joined: Nov 2009
Posts: 154
Likes: 1
a lot of good information. I just reset the pressure on my tires from 35 to 42 psi, which is 70% of max psi as they are load D tires. This is what they were set to when I bought the wheels and tires used. They were on the same style f150 as mine so probably about the same weight. Ride is a little rougher now but still acceptable. Truck also is about 4600 pounds, 2650 plus on the front around 1950 on the back axle.
Senior Member
Joined: Dec 2009
Posts: 102
Likes: 1
From: Texas
a lot of good information. I just reset the pressure on my tires from 35 to 42 psi, which is 70% of max psi as they are load D tires. This is what they were set to when I bought the wheels and tires used. They were on the same style f150 as mine so probably about the same weight. Ride is a little rougher now but still acceptable. Truck also is about 4600 pounds, 2650 plus on the front around 1950 on the back axle.
what are the specs. on your tires?
Senior Member
Joined: Nov 2009
Posts: 154
Likes: 1
specs are Toyo Open Country ATs, load D with max inflation of 65 psi, 285/17/70s , max load at 65ps is 3195 lbs
------size-----------------psi->35 40 45 50 55 60 65
LT285/70R17 126S E/10 33X11.5R17 2105 2315 2510 2755 (C) 2890 3070 3195 (D)
------size-----------------psi->35 40 45 50 55 60 65
LT285/70R17 126S E/10 33X11.5R17 2105 2315 2510 2755 (C) 2890 3070 3195 (D)
Last edited by svt4cobra6; Jan 30, 2010 at 08:50 PM.
Senior Member
Joined: Nov 2009
Posts: 154
Likes: 1
Senior Member
Joined: Dec 2009
Posts: 102
Likes: 1
From: Texas
The ride is super smooth when you have the correct tire pressure for the weight of the vehicle. It's great! The affect in gas milage when tires are overinflated is not worth it!
Senior Member
Joined: Nov 2009
Posts: 154
Likes: 1
Test it out, but get the truck on a scale first. You'll want to confirm the weight of the steering and drive axle for an accurate caculation.
The ride is super smooth when you have the correct tire pressure for the weight of the vehicle. It's great! The affect in gas milage when tires are overinflated is not worth it!
The ride is super smooth when you have the correct tire pressure for the weight of the vehicle. It's great! The affect in gas milage when tires are overinflated is not worth it!
Senior Member
Joined: Nov 2009
Posts: 239
Likes: 8
From: Alberta Canada
Ya SVTCobra you "HAVE TO" weigh the axles for this to work with just guessing it is useless.
Rob/HBT