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  #1  
Old 12-31-2013, 07:23 PM
RaymondT RaymondT is offline
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Default 2014 Sport 20" tire pressure - Dodge wrong?

I just traded in my 2008 Sierra Denali. It's curb weight was just slightly lower than my Ram Quad cab.

What's odd is that the tires are almost identical in size. GM was 275/55R20 and the Sport is 275/60R20. The Denali came with Eagle LS2's and the door sticker said 30lbs all around (35 typical for 17" tires). The Ram calls for 39lbs all around. I played with all sorts of different pressures and finally came to the conclusion that GM was spot on. That gave the best handling, comfort, and adhesion. And before all the rednecks chime in with their 40+ comments, bear in mind the all-important contact patch. This is the part that stops your truck in the shortest possible distance when something happens in front of you.

When I picked up the truck, I was spinning at every intersection with a wet road. I now see that the tires are so over-inflated, the contact patch is barely there in the back with 39psi. My winters are much wider where the rubber meets the ground than the SR-A's that came with the truck even tho they are the same size.

I'm thinking Dodge got it wrong for the 20's. The wider the tire, the less pressure is required to support the load. Anybody agree?
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Old 12-31-2013, 08:39 PM
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Hey Raymond! 1st Redneck here!....I would email RAM and point out these significant findings, and ask them " what the crap, eh?! They might hire you to be part of the research team! Redneck out! haha
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Old 12-31-2013, 09:48 PM
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^^While that is uncalled for, OP, it doesn't serve to call us all rednecks, mine is a healthy shade of dark pink thank you very much.

As for the tire pressure, it's actually set to take the suspension design into account. There are two spring rates at each corner that need to be designed for, the actual spring and the spring rate of the tire. Too soft a tire pressure and you increase tire's damping ability which will decrease the amount that spring and shocks handle which will increase the wear rate on the tire's side wall; too hard and you're transferring more to the spring and shocks. If you get the right input frequency you can actually induce harmonic resonance into the system and then things start breaking.

Now, your traction issues are caused by the absolute crap that is the Goodyear SR-A. They are the second worst tire I've had on a new truck, the first being the POS 17" on my '13 SuperDuty that left me stuck in 2" of mud on a road to work

A proper set of tires with a real compound and tread design will treat you much better. Or you can try playing with the air pressure until the tire pressure nanny gets upset.
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Old 12-31-2013, 09:52 PM
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I agree in the fact that what is suggested and what works best can be totally different things. I usually start at the suggested inflation and adjust from there. Just as you had mentioned along with tread wear and comfort. I have been making adjustments to all the tires on all the vehicles I have owned for the loads I tow, the way I drive, and the comfort and safety thats to my standards, not theirs....
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Old 12-31-2013, 10:33 PM
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i have ben keeping the stockers on rcsb 4x4 between 34 and 36 lbs. haven't rotated, was hoping they would wear out faster, and the ride id fine and tires at 30000 will easily see 40000miles. the ride is comfortable.
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Old 12-31-2013, 10:52 PM
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Another Red/BrownNeck here as well, but the tire pressures suggested on your load sticker are the manufacturers recommendations. The tire sidewall on the other hand gives you a MAX tire pressure when carrying the max load for the particular brand of tire you're running. Adjustment to any vehicles tire pressures is a proactive and ever changing event because driving empty, loaded, or to max payloads all require a different air pressure setting in order to take full advantage of each particular tires strengths.
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Old 01-01-2014, 03:14 AM
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OK, sorry about the "redneck" comments. I appreciate the thoughtful responses. The whole point is the tire width vs the weight of the truck. The wider the tire, the less pressure is required to support the same weight. At 39psi and 11" of tread width, my rear tires look like perfect circles. I think I'll try 39 front, 35 rear and see how that pans out.
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Old 01-01-2014, 04:47 AM
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I didn't care for the ride or grip that the OEM tires gave me, especially on damp or wet surfaces
I switched over to Michelin LTX MS2 & the dealership puts one pressure in them, then i go to Discount Tire for the regular rotations & they raise it 4 pounds

by the way, neither has weighed my Ram, neither of them know that i always have 800 pounds in the bed & sometimes even more when i fill all the gas containers back there & then i have another 110 pounds approximately, 40 gallons of it
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Last edited by GTyankee; 01-01-2014 at 04:55 AM.
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