tire pressure - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 14 (permalink) Old 02-19-2007, 10:40 PM Thread Starter
 
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tire pressure

My F250 S/D (2002) calls for load range E or I running at 65 front & 80 rear. Previous owner put on load rande D Kelly AT's. Any idea what a good pressure range is for them?

The local dealership morons told me that you should put the factory 65/80 in them - I offered to let them do it if they would replace the tires when they blew out in their installer's face and they didn't seem to understand the concept of maximum inflation pressures.
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post #2 of 14 (permalink) Old 02-19-2007, 10:48 PM
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those factory specs are for a fully loaded truck...(hauling or towning)

if your running around empty...anything around 35-40 psi will be fine (regardless of load range)

e99 leveled on 35s
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post #3 of 14 (permalink) Old 02-19-2007, 11:07 PM
 
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You have to look at the weight carrying rating of each tire. My 285's are rated for 3300 lbs each at the maximum of 65 psi. My PSD (and yours too) weighs right around 5500 lbs on the front axle which means two things: one, my tires (front axle total) can carry 6600 lbs so they are adequate for the front end, and two, they are in the upper end of their carrying range so I run them in the upper end of their inflation range as well.

I run 55 - 60 psi on the front axle and 45 - 50 on the rear axle. When loaded or pulling I will pump up the rear tires to ~60 psi and leave the front axle at 60 psi.

Interestingly enough, I just was looking at my wife's PSD (also a 2002 CC, LB, 4x4) and realizing the tires will need to be replaced in the next few months. When I pulled the original receipt for the tires out of the glove box it told me that the tires had over 48,000 miles on them! I'm actually gonna get 50,000 miles out of a set of tires on a PSD. Of course they are BFG All-Terrains and they are my 6th set that I've ran on various pickups...

The Toyo A/T's on my PSD (in sig) are not going to make 40,000...grrrrrrrr....
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post #4 of 14 (permalink) Old 02-20-2007, 01:36 AM
 
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Anyone every try the chalk method for finding the right tire presure? It's pretty simple, just a little time consuming.
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post #5 of 14 (permalink) Old 02-20-2007, 03:34 AM
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Personally I just read what pressure is suggested on the tires and pump it up to that...simple as that:Thumbup: I'm towing most of the time anyway.

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post #6 of 14 (permalink) Old 02-21-2007, 02:16 AM
 
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Woops, I don't know why I thought the front end weighed so much...I just ran my pickup across the scales and it was 4750 lbs on the front axle. Sorry!

Not near the 5500 I quoted earlier...ack...
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post #7 of 14 (permalink) Old 02-21-2007, 02:30 AM
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Quote:
Originally Posted by FireHunter
Woops, I don't know why I thought the front end weighed so much...I just ran my pickup across the scales and it was 4750 lbs on the front axle. Sorry!

Not near the 5500 I quoted earlier...ack...
Those Toyo AT's are garbage... I got less then 30k out of the set of 37's I just swapped out... Went back to the MT's...

Got 65,000 miles out of the 37" MT's the first time... If your looking for new ones look there! My 37's are load range E, 4400lbs each!!!

01 F-250 SC PSD,210k,16 Isspro Gauges, AFE-2,CCV Mod,IAH delete,map reg,Modded H2e, 6.0 IC, GTS Hybrid injectors, Studs, 910 Valve springs, Forged rods Water injection,Swamps tuned, MBRP 4" dual's, Aero, 6" tip's, 100 axl tank, 4" Revtek lift, 37-14.50-17 TOYO MT's 469hp and 1068tq...

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post #8 of 14 (permalink) Old 02-21-2007, 02:35 AM
 
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80 lbs here baby
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post #9 of 14 (permalink) Old 02-21-2007, 03:19 AM Thread Starter
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Big Green -- could you please 'splain the chalk method?
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post #10 of 14 (permalink) Old 02-21-2007, 03:56 AM
 
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I think he's talking about putting a chalk mark across the tread of the tire, driving it, and seeing what spots wear off the chalk. Then changing pressure and go again.
When the chalk mark wears off evenly, you have the optimum tire pressure and the tire will wear most evenly.
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