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1999-2007 Upgrades and Aftermarket - General Upgrading or adding OEM or aftermarket equipment to your 1999-2007 Super Duty. Please confine discussion of topics in this forum to those items that are not engine-specific.

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Old 10-24-2006, 10:48 AM   #1 (permalink)
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TOYO MT AIR PRESSURE

I just purchased Toyo 35x12/50x20 MTs. The max load pressure for them is 65psi max. The max load pressure for the stock tires is 85psi. The standard pressure in the door for the stock tires is 65 psi. The toyos sure are stiff at that pressure. What are you guys running for pressure for every day driving? I can air them up when loaded.
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Old 10-24-2006, 11:36 AM   #2 (permalink)
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Re: TOYO MT AIR PRESSURE

I'm running 60psi in mine. The ride is definitely stiffer but I dont want to go adjust my tire pressure every weekend when I tow my boat. With the higher air pressure I get about 1 mpg better per gallon, and it makes steerring at idle much easier.
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Old 10-24-2006, 01:51 PM   #3 (permalink)
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Re: TOYO MT AIR PRESSURE

I ran mine at 55 for the life of them... 55,000 miles...best towing tire out there if you ask me...
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Old 10-24-2006, 01:54 PM   #4 (permalink)
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Re: TOYO MT AIR PRESSURE

Thanks guys,
I had settled on 55 in the front and 50 in the rear. I just did not want to wear them out to fast.
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Old 10-24-2006, 02:39 PM   #5 (permalink)
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Re: TOYO MT AIR PRESSURE

[ QUOTE ]
...best towing tire out there if you ask me...

[/ QUOTE ]

That's a pretty strong statement. Really? I have been looking at them but was woried about towing and wearing them out quickly. Hmmmmm...
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Old 10-25-2006, 09:05 AM   #6 (permalink)
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Re: TOYO MT AIR PRESSURE

The tire industry strongly suggests you pump the tires up only to the PSI needed to support the load you are hauling on that tire. So use a load/inflation table, along with a weight ticket that shows the weight on each axle, and apply that table.

All tires that have a weight capacity of 3,195 pounds @ 65 PSI will have the same load inflation table. Here it is for your tires:

PSI Load
-- ----
35 2040
40 2245
45 2440
50 2680
55 2805
60 2980
65 3195

When unloaded, your weight ticket might show 4300 on the front axle and 3500 on the rear axle. Which is 2150 on each front tire and 1750 on each rear tire. So per the above load/inflation table, you'd need 40 front and 35 rear when unloaded.

Put the truck to work, and you might have 4600 on the front axle and 5200 on the rear axle. Or 2300 on each front tire and 2600 on each rear tire. So in that case the above table says 45 front and 50 rear.

Loaded to the gills and right up against the weight capacity of your tires, then you might have 5,000 on the front axle and 6300 on the rear axle. Or 2,500 on each front tire and 3150 on each rear tire. That means you'd need 50 in the front tires and 65 in the rear tires.

Note that with only 3,195 weight capacity per tire, an '05-up F-350 SRW no longer has a GVWR of 11,500 pounds. With a max load of 6,390 on the rear axle, a GVW of 11,500 would probably overload your rear tires.
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Old 10-27-2006, 01:45 AM   #7 (permalink)
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Re: TOYO MT AIR PRESSURE

Woah, maybe I'm under-inflated then. I'm running 35psi in my 37x13.5x17 MT's. If the above chart is right, that should still work for a 8160 load. They are load range E. For my truck, and also pulling a 5000lb trailer- what should I be running? Maybe I shoudl take it up to 45psi.

I know you have to be careful with pressures- my dad had a '89 E250 diesel van, put on Michelin 10 ply truck tires and pumped them up to the max (I think 85psi). Took a bumpy interchange ramp and just about bounced off the road into the barriers. He found out that he only needed half that pressure.
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Old 10-27-2006, 11:00 AM   #8 (permalink)
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Re: TOYO MT AIR PRESSURE

[ QUOTE ]
Woah, maybe I'm under-inflated then. I'm running 35psi in my 37x13.5x17 MT's. If the above chart is right, that should still work for a 8160 load. They are load range E. For my truck, and also pulling a 5000lb trailer- what should I be running? Maybe I shoudl take it up to 45psi.

I know you have to be careful with pressures- my dad had a '89 E250 diesel van, put on Michelin 10 ply truck tires and pumped them up to the max (I think 85psi). Took a bumpy interchange ramp and just about bounced off the road into the barriers. He found out that he only needed half that pressure.

[/ QUOTE ] The above numbers do not apply to your 37 MTs. At 65 psi your max load is 4300lbs.
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Old 10-27-2006, 11:12 AM   #9 (permalink)
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Re: TOYO MT AIR PRESSURE

I run 45 front, 35 back in my 38s.

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Old 10-28-2006, 08:21 PM   #10 (permalink)
 
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Re: TOYO MT AIR PRESSURE

On my 38/14.50R16s I'm running 42psi front and 32psi rear.
Seems to be the best psi to get them to ride and wear well.
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Old 10-30-2006, 08:15 PM   #11 (permalink)
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Re: TOYO MT AIR PRESSURE

with tires in sig. 50 front & rear, more in rear's depending on load
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Old 11-01-2006, 08:45 PM   #12 (permalink)
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Re: TOYO MT AIR PRESSURE

[ QUOTE ]
Woah, maybe I'm under-inflated then. I'm running 35psi in my 37x13.5x17 MT's.

[/ QUOTE ]

I run 47 up front and 42 out back when unloaded and have gotten even wear and consistent chalk marks running 37x13.5R17 Toyo MTs
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