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Old 06-18-2017, 09:55 AM   #1 (permalink)
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Default Recommended tire pressure for bigger tires

Hi,

I have a 1994 Geo Tracker 2dr 4wd softtop 8v manual. The tires that were on my tracker were a little bigger than the stock size: 225 70 r15. The stock size described on the door was supposed to be 205 75 r15. Anyway was wondering if I needed a little more air for my bigger tires than the recommended tire pressure of 23psi for the smaller stock tires.

Any tips would be appreciated. Thanks!
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Old 06-18-2017, 11:25 AM   #2 (permalink)
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Generally speaking, larger tires can be run at lower pressure than stock, but I run my 235/75's at the recommended 23 PSI & it rides well.
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Old 06-18-2017, 06:11 PM   #3 (permalink)
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Quote:
Originally Posted by fuzzy1 View Post
Generally speaking, larger tires can be run at lower pressure than stock, but I run my 235/75's at the recommended 23 PSI & it rides well.
Thanks! I'll keep it at ~23psi then!
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Old 06-18-2017, 09:50 PM   #4 (permalink)
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You might want to look at the recommended psi on the tire. If you are running an extra load 235 tire, that may not be enough pressure for the tire itself. You might experiment with some different pressures to see how the vehicle handles and rides, as well as watching tire wear. A tire with a taller sidewall can provide the same ride quality at a higher pressure as a shotter tire, and will have more tendency to roll under and have poorer handling characteristics than a shorter tire at the same psi.
Remember the Ford Explorer Firestone tire debacle? Most of that problem was on Ford for running too little pressure in the tires for their size, etc. That particular tire was sold and used on lots of other vehicles, and I believe even Ford pickups of the same era, but the primary problem was on OEM equipped Explorers...hmmm
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Old 06-18-2017, 09:54 PM   #5 (permalink)
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Just did the math, the difference in tire height you have is negligible (1-2% or 4-5 mm...), so you are probably fine, but you might still try playing with pressure some and see what happens. I always run near maximum psi stamped on tire cuz I am cheap and like to keep rolling resistance down for the theoretical increase in mpg.
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Old 06-19-2017, 04:40 AM   #6 (permalink)
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Normally the max pressure that is printed on the tire will be an indication of 'max load at max pressure'.....My 235's have a max pressure of 51psi. I would probably break my back teeth if I rode at that pressure, and the hardness/shock of that ride would probably impact the vehicle, as well. You can easily tell if your tires are crowning, by marking a line across them with chalk or similar, drive forward a few feet and investigate that line vs the width of your tire. Personally, I ride at about 26 psi, but could even drop them down further. I would stick with the factory recommendation of 23 psi.
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Old Yesterday, 06:07 PM   #7 (permalink)
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For some reason I didn't get an alert for this thread...

Anyway the max described on the tires is 40psi. My tires are between 23-26psi and feels ok to me. I'll just keep it at that
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