Wheels list 65 max PSI

[BroncoHauler]

Originally Posted by 86Scotty

I hope that tidbit helps you and others Mike. It's an incredibly useful tool in your traveling vehicle. It can save you from burning yourself in a quick roadside fix of any sort and it helpful around camp for lots of things. I bought one for myself, Dad and brother after about 8 friends had trailer tires blow. Heat is the enemy of tires!

I've also used an IR thermometer to check the temps of hubs. Can give you early indication of a bearing failure.


Herb

[86Scotty]

Originally Posted by BroncoHauler

I've also used an IR thermometer to check the temps of hubs. Can give you early indication of a bearing failure.


Herb

Yep, endless uses. Even diagnose your kid's fever by shooting his forehead.
Don't blind him. He'll hate you for it.

[SCMatthew]

Thank you for all of the replies. The wheels look like Mojave. John at Agile guesses the weight of the van at 10K.

[JoeH]

I've got my ATX Mojaves off and had a looky. The load rating is 3300lb but I couldn't find any markings indicating a max 65psi.

[James4]

Always an interesting subject. I'm still experimenting with this issue. I have a 2008 Ford E-350 RB 6.0 diesel SMB. It weighs about 8560 pounds with the wife and I, a full tank of gas and full tank of water. The front weighed in at about 4200 and the rear about 4360, without being loaded for a trip. The party that I bought it from was running Firestone Transforce ATs, 245/75/16 on, more likely than not, stock rims, and I have not changed them. One of the best rides so far is 60 PSI front and 72 rear, but like I said, I'm still experimenting, and might raise the pressure in the front in the near future. When I recently had it serviced at the Ford dealer, the tire pressure was set at 72 around...as I recall. Which gave a better ride than what I experienced up to that point in time.

Question for the more experienced here: Should I run less pressure than I am at the time or what?

James

[JoeH]

Originally Posted by James4

Always an interesting subject. I'm still experimenting with this issue. I have a 2008 Ford E-350 RB 6.0 diesel SMB. It weighs about 8560 pounds with the wife and I, a full tank of gas and full tank of water. The front weighed in at about 4200 and the rear about 4360, without being loaded for a trip. The party that I bought it from was running Firestone Transforce ATs, 245/75/16 on, more likely than not, stock rims, and I have not changed them. One of the best rides so far is 60 PSI front and 72 rear, but like I said, I'm still experimenting, and might raise the pressure in the front in the near future. When I recently had it serviced at the Ford dealer, the tire pressure was set at 72 around...as I recall. Which gave a better ride than what I experienced up to that point in time.

Question for the more experienced here: Should I run less pressure than I am at the time or what?

James

Load rating on that tire is 3042lb at 80psi. https://tiresize.com/tires/Firestone...-245-75R16.htm

You can use a load index chart to figure out an appropriate tire pressure or you can use this back of the seat method which has been posted a few times on this forum:

Rear tire:
4360/2=2180lb per tire
2180/3042=0.27 x 80 psi x 20% safety factor = 69psi

[James4]

Originally Posted by JoeH

Load rating on that tire is 3042lb at 80psi. https://tiresize.com/tires/Firestone...-245-75R16.htm

You can use a load index chart to figure out an appropriate tire pressure or you can use this back of the seat method which has been posted a few times on this forum:

Rear tire:
4360/2=2180lb per tire
2180/3042=0.27 x 80 psi x 20% safety factor = 69psi

Thanks JoeH, for the continuing help!!!!!!!!

Have a great day!

James

[MountainBikeRoamer]

Very cool reading how JoeH arrived at an ideal tire pressure!

But....allow me to throw another tire-pressure-setting data resource into the mix.

It arrives at very different PSI numbers.....generated using specific tables/charts developed by the Tire&Rim Manufacturer's Association. Perhaps other forum members can weigh in on the merits of one method vs. another of determining correct tire pressure with respect to tire size and applied load (This is from an older thread (back in November of this past year.) The discussion was primarily around front-end wander, and incorporated some talk of appropriate tire pressure for the weight of a vehicle.)

Knowledgeable forum member carringb shared the following tidbit of information. A very useful link for calculating correct tire pressure for the given weight that the tire is being asked to carry, regardless of which brand tire you're running.

Originally Posted by carringb

Here's one from Toyo. It actually doesn't matter which brand's table you use. Its the Tire and Rim manufacturer's Association that set these ratings. LT tires start on page 22. (edit: they actually start on page 20.)

https://toyotires-1524598101.netdna-...s_20151020.pdf

You've got the front/rear axle weights for your van, which is fantastic.

JoeH already figured out your "per tire" weight for the rear at 2180 pounds per tire (and it looks like around 2100 per tire for the fronts.)

For your given tire size of 245/75r16, then according to the chart for LT tires in the above .pdf file on page 21, here is the stated relevant range of PSI settings and corresponding load ratings:


40 PSI -- 1,870 pounds per tire
45 PSI -- 2,030 pounds per tire
50 PSI -- 2,205 pounds per tire
55 PSI -- 2,335 pounds per tire
60 PSI -- 2,480 pounds per tire
65 PSI -- 2,623 pounds per tire
70 PSI -- 2,765 pounds per tire
75 PSI -- 2,900 pounds per tire
80 PSI -- 3,042 pounds per tire

So according to those charts and with your tire sizes and specific per-tire weight measures, you'd want between 45 and 50 psi in your tires.]

You can see how 70 psi is indicated for much more load per tire than you're carrying.
(**Also, to verify agreement between these universal charts and Firestone's own numbers...note how indeed these charts indicate your tires are rated for the same "3042 pounds per tire at 80 psi" spec that Firestone does.)

For anyone else interested in getting some quality measures of their rig's front/rear weights:
There's DOT-certified-accurate CAT scales (big-rig trucker scales) located all over the place. They'll give you an accurate reading for each axle as well as total weight.

CAT Scale Locator
https://catscale.com/cat-scale-locator/

Cheers.......and roll on, good buddy!

[James4]

Mike T

Thanks man!

I also hope that other forum members will weigh in on this issue as well with some detailed notes of their own. The lower pressures in the chart seem to support 86Scotty's general comments of pressures that he has used in the 50 to 60 range.

Thanks, again, for the information!

James

[rallypanam]

Interesting tidbit I noticed when I looked up BFG KO2s.. notice the different weight ratings on 16" vs 17" wheels.. glad I have 16s!

LT285/75R16/E 126 R 3750@80
LT285/70R17/E 121 R 3195@80

LT315/75R16/E 127 R 3860@65
LT315/70R17/E 121 S 3195@65