KID2TEXAS
Memphis, Tenn
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Joined: 04/16/2004
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good point Jaugurston, Dandba be advised that if you only changed the tires and not the rims and you try to put the tires up to 80 psi with 65psi rims you could have problems. Like stated above a lot of folks think you can just change the tire to a bigger size and forgot about the rim safety.
my 2 cents
2006 Ford F-250 Super Duty, Amarillo Special Edition 4 X 4 & 6.0 PSD,
Tow Haul/Tow Boss/Tow Command, 18" load E tires standard.
Me, a Wife and two crazy kids 
2006 Holiday Rambler, Next Level 38FKS
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2007Rockwood2601
IL
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Joined: 09/11/2007
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I am thinking of replacing my P tires with LT load D tires and I found this chart for Goodyear tires. Look on your door sticker for the max axle load then look up you tire on page 7. Example a 4150 LB axle would be 40 PSI
Goodyear chart
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2003 Chevy 1500 Express AWD 5.3 3.73's
Husky round bar
P3 brake controller
2007 Rockwood 2601SS
12K loaded
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Hannibal
Gas Station
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Joined: 04/12/2002
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I run 40PSI in my E rated tires when not towing or carrying heavy loads. 50 front and 70 rear when towing. I now have 87k miles on the original Michelins with maybe 10-15k left on them. I've tried higher pressures for mileage and all I got was a harsher ride. Mileage stays the same 14~ light city and 17+ highway. With the Cummins powered Rams and their 300 lbs extra out front, I ran 50psi front and 40psi rear empty. Michelin LTX A/S's are hard even with 40psi but 70psi rides like it has wooden wheels.
'05 2500HD Dodge 5.7L Hemi 5spd auto/3.73 SLT. 96k miles
ex '95 Cummins,'98 12v Cummins,'01.5 Cummins,'03 Cummins
'07 KZ Jag 28JFSS.
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Gale Hawkins
Murray, KY
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Joined: 07/22/2007
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You can greatly increase the roll resistance when you move to a tire over rated for the load. In the MH where E's are the proper rated tires for the load and you move to an F expect MPG decrease. If you go to a G expect a greater drop in MPG. The thinner the side walls the better the MPG should be.
More is NOT better when it comes to tires per some tire companies. Over rated tires will be damaged more hitting pot holes, etc. This is in a link in the tread about printed PSI rating on the tire is the MAX PSI for that tire at the rated speed.
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Herculez
North Carolina
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Joined: 08/13/2006
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KID2TEXAS wrote:good point Jaugurston, Dandba be advised that if you only changed the tires and not the rims and you try to put the tires up to 80 psi with 65psi rims you could have problems. Like stated above a lot of folks think you can just change the tire to a bigger size and forgot about the rim safety.
my 2 cents
I like both of your post. Very Good!
Lets check your valve stems also. Are you using high pressure valve stems?
40 psi is a very low air pressure for E rated tires. Even if you have a miminal amount of weight.
You have side wall issues with a E rated tire at 40 psi. Follow the advise of others here with a increase in pressure.
Wheel PSI
Valve PSI
Britt
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8.1 Van
Millstone NJ
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Joined: 03/20/2008
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I keep 60psi front and 80psi rear in my LT265/75R16E's because I only use it for trips fully loaded unless I need to pickup something big at Home Depot etc.
FKA PSDExcursion
2002 Chevy Express LS 3500 8.1 155" WB passenger van 3.73 posi (GT4/G80)
41 Ft 2003 Thor Citation 41-ZBSR TT w/ Hensley Arrow
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DIMDave
Sachse, TX
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Joined: 05/21/2007
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Rub chalk across the treads then drive in a straight line for several revs. Look at the chalk(dirt, wear) pattern. The edge of the tread(1/4") should just touch the ground and have a pebbly pattern. The rest should be clean. Adjust pressure accordingly. My tires have worn uniformly for 60k+ many times.
97 Sun-Lite Eagle RK
01 F250 CC SWB PSD
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