Tire Inflation, Really? - Page 2 - Fuelly Forums

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Old 06-20-2008, 07:17 AM   #11
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Quote:
Originally Posted by finfin View Post
p205/75 R15 Goodyear Regatta... I just looked and the center wear is mostly on the back tires. I get a tread gauge and report back later.
Ah. A tire that size is rated for nearly 1,600 pounds load at 44psi, probably something like 1,500 at 40psi. That's a lot of tire for a 2,200 pound vehicle, so I think we've found one instance where center wear is quite predictable.

Of course I'd guess that over 60% of the weight is on the front, considering that the center wear was on the rear tires. I'd say you probably won't lose any FE by taking a few pounds out of the rear tires; by the time they're center wearing you've already passed the point of diminishing returns.
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Old 06-20-2008, 07:20 AM   #12
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One thing I wonder about is if the psi reading on your door is totally accurate or if you should fill your tire with more air then that to get better mpg... I like to fill mine 5 psi higher, but sometimes I wonder if 10 could be better or if the wear to the middle and lost traction is worth it..
Nice to know, I will bump up my psi a little higher and keep a keen eye on it.
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Old 06-20-2008, 07:20 AM   #13
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Pale's Civic's OEM tire size is 175/70-13, and are rated for 1050 pounds at 51psi, while the car's weight is a few hundred pounds more than finfin's Tracker. I suspect that those tires would wear evenly at 55psi.
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Old 06-20-2008, 07:38 AM   #14
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The tires I mentioned were firestones (fr380, I think). Budget tires, 44psi sidewall.

finfin, what's the manual / door jam call for? Is it different for front and rear? Maybe we should be looking at that and maintaining the difference as we increase overall.
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Old 06-20-2008, 07:43 AM   #15
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23/23 (psi)
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