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Old 11-23-2012, 01:48 PM   #1 (permalink)
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Tire pressure questions?

I have a 1992 pickup base model. The original tires were 195 75R 14, but when I bought it the tires were and are 205 75R 14. The label on the door jam says that the correct psi is 35 cold. Is 35 psi the correct pressure for the 205 75R 14 tires also? Does recommended psi vary by tire size? I am about to move my belongings with this truck. When I do should I add more psi to the rear tires? Thanks for any replies?
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Old 11-23-2012, 01:50 PM   #2 (permalink)
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35 psi is plenty of pressure for anything that truck is capable of. Modern tire construction makes tires a lot more stable than they were when the truck was built. Even so, it would not hurt anything if you wanted to bump up the rears a bit in pressure when you are fully loaded.

You should be good to go!
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Old 11-23-2012, 03:35 PM   #3 (permalink)
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Quote:
Originally Posted by John999 View Post
I have a 1992 pickup base model. The original tires were 195 75R 14, but when I bought it the tires were and are 205 75R 14. The label on the door jam says that the correct psi is 35 cold. Is 35 psi the correct pressure for the 205 75R 14 tires also?
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Does recommended psi vary by tire size?
No, pressure is pressure. A larger tire requires a larger volume of air, but suggested pressure would be the same.

But different tires from the stock ones might work better at a different pressure, you can always vary the pressure to see what works best.
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Old 11-23-2012, 04:07 PM   #4 (permalink)
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Old 11-25-2012, 07:52 AM   #5 (permalink)
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If you're loading the truck up, inflate the tires to their stated limit as their load ratings on the tire are for that pressure.

too low pressure WILL cause handling problems, wear problems, heat problems, damage, and blowouts.
too high pressure (within the rating of the tire) may cause slight, almost unmeasurable loss of traction (till you get crazy overinflated), and a harder ride.

After working in a shop and 2 dealerships for several years I've seen 2 examples of tires with stereotypical center (overinflation) wear pattern. Both were on ford rangers (which are even lighter in the back than our trucks despite being heavier overall) that never rotated the tires. I've seen over a dozen examples of cars with underinflation wear that the owners religiously kept the tires at the door-sticker pressure.

over/underinflation is a function of how much it's carrying. if going to a wider tire, yes you do lower pressure *slightly* to be textbook perfect. in the real world, the difference is less than the difference between brands. speaking of which, I've seen cheap tires more than 2" narrower tread for the same size than a high quality tire. on the same vehicle, the cheap tire is bulging out and almost riding the sidewall at HIGHER pressure than the good tire at "proper" inflation (When I worked in the shop: 235/75r15 (stock for dakotas, 4wd S10s/blazers, rangers, etc) mastercraft AS/4 vs any Cooper Discoverer

Also remember that the number on the door jamb is COLD inflation and accounts for heating during driving. including driving down the highway for hours when it's 100f out. My Cressida's owner's manual even say "for extended highway driving, increase cold inflation pressure to 35 psi"(from 31 or 32)

All said and done, tires are overengineered by a huge factor. When you see people putting 6k lb SUVs on 2 wheels and driving down the road, they're usually inflated to 90+psi (or so I've read in a few places that talk about it). If they weren't, they'd blow out every time you ran over a pebble

Oh, and make sure your spare is inflated too. I lost track after a week in the shop of how many people's spare tire had zero pressure in it. Take a wild guess how useful that is.
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Old 11-26-2012, 02:42 AM   #6 (permalink)
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Thanks for all the info. This forum is awesome.
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