Tire pressures?
01-21-2006, 09:35 AM
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Tire pressures?
Right now I have about 45 per tire. Wondering if inflating to the max will ride much worse, wear the middle of the tire. I would imagine it would not be as good in the snow with max inflation. Thinking I may get better mileage. Thanks, Jim
01-21-2006, 09:45 AM
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dealers do this imho to make the ride more smoothe when you take it for the test drive, with the weight of that motor on the front tires I would get out there aspa and fill them to mor e what the door jamb says oif not close to the spec on the tire for max weight. This will lower the rolling resistance and make the tire less suceptable to heat buildup. We all know what low presure can do, just say Firestone and I bet you know what I mean. Also important to watch the oil change jockeys if you go in for service, they are notorious for putting in whatever the doorjamb says, even if you are running 35 inch tires... you should see how small the contact patch gets when they put 65 psi in them. 
for the rears you should look for a good balance between what you do, tow alot? keep them close to the front presure, empty? a bit less in the backs5 - 10 psi othewise you will wear out the centers.
for the rears you should look for a good balance between what you do, tow alot? keep them close to the front presure, empty? a bit less in the backs5 - 10 psi othewise you will wear out the centers.
01-21-2006, 10:21 AM
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I just set each of them at high 50's. My mileage has been very good but could always be better. if it hurts the ride a bit I don't think that will bother me. More concerned with tire wear. Jim
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01-21-2006, 02:37 PM
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I'm running 50psi front / 45psi rear on my BFG 315s. I ran 70psi front / 60psi rear on my stock tires. I bump up the rear pressure to 50psi when I tow. I don't have that many miles on the 315s, but they seem to be wearing OK.
01-21-2006, 08:00 PM
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did 3 trips from New London, CT to Ft. Drum, NY in a time of about 6 weeks...first trip was 45psi (18mpg)...second trip 50psi (18.5-19mpg)...third trip 60psi (22.5mph). All tires were the same, similar loading, weather, and such.
01-22-2006, 10:32 PM
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I'm running 35" Toyo AT's and so far have 50 front/40 rear. The rear is fine, but sometimes I look at the front and wonder if they'll handle 55 or so, even though they are rated at 50 psi. Makes me think I really do need an E rated tire. Man that Cummins is heavy. I've never ran more than 35 psi in the front on any of my gasser trucks before with 37's.
01-23-2006, 05:22 PM
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You know, I think from time to time this subject needs to be brought up just so all of us will go and check their tires out!!! Wheres the guy who writes the safety manuals, I'm sure he'll show up soon. 
I'm running what the tires say to run on them, they are the stock tires and I can't remember what they're set at but I stopped at the closest station to the dealer and filled them to where they are supposed to be, I guess it helped that I knew I was about to drive 500 miles or so non stop just to get home!
Jason
I'm running what the tires say to run on them, they are the stock tires and I can't remember what they're set at but I stopped at the closest station to the dealer and filled them to where they are supposed to be, I guess it helped that I knew I was about to drive 500 miles or so non stop just to get home!Jason
01-26-2006, 01:41 AM
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Read the Tire inflation guide that should have come with the truck, in the glove compartment. According to the 03 Guide the front tires should have 50-60lbs in the tire for the 3500 w/CTD 4X4 SRW & 45-55lbs for the 2X4. The rear wheels should have 40-75lbs for both.
More info on what type of truck you have would help
More info on what type of truck you have would help
