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Old 04-29-2008, 11:26 AM   #11 (permalink)
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Out of curiosity, have you checked the pressure when hot?

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Old 04-29-2008, 02:00 PM   #12 (permalink)
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Quote:
Originally Posted by BBsGarage View Post
Out of curiosity, have you checked the pressure when hot?
I would like to see that figure too. But the higher the cold state pressure, the lower the hot state pressure differential, as there is less deformation thus less heat.
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Old 04-29-2008, 02:16 PM   #13 (permalink)
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You could also say that the higher pressure would cause less grip and more sliding thus more heat.

But this is why I'd love to see the cold and hot pressures
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Old 04-29-2008, 02:27 PM   #14 (permalink)
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Yesterday 3 tires were at 60, rear right was at 58.
Upon arrival (26 miles later) I was at 62-63 on the 3 and about 60-61 on the rear right.
Didn't check cool taking off, but measured when I arrived home and it had remained consistent with earlier that afternoon.

This is using your typical freebie pen style air pressure gauge.

Looking to buy a dial or digital styled one, but its hard to find one with good reviews for accuracy. The highest rated one I've found maxes out at 60 so a lot of good that will do me.
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Old 04-29-2008, 02:51 PM   #15 (permalink)
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I use a Accutire digital pressure gauge. Its very nice and I hear very accurate.
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Old 04-29-2008, 10:20 PM   #16 (permalink)
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Campbell Hausfeld au1100

I just picked this up at Wal-Mart (only $7) this weekend and I love it! I know it's pretty cheap, but it tests well against my other gauges. It ranges from 5-99 PSI in .1 PSI increments although, I've only tested it in the 40-50 PSI range.

Differences from CH gauge:
stick: +/- .5 PSI
dial: - 2-3 PSI
digital gauge on my Craftsman air compressor: + 4-5 PSI
tire pressure sensors in the Jeep: + 1-2 PSI

I went a little overboard when you guys started talking about your gauges being inaccurate, but I only purchased this gauge and the dial recently. (~$15 for the two) I've been gradually raising the pressure in my tires over the last several weeks. The sidewall rating is 35 PSI. They started at about 34, then I raised them to 44-45 after about a week. Recently I raised them up to 48-49. When I was running 44-45 I did a one way trip of ~60 miles about 90% interstate @70MPH. Warm pressure was 47-48.

I thought you all might find a couple of my experiences helpful.
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Old 04-29-2008, 10:30 PM   #17 (permalink)
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I just noticed the sides on a couple of my truck tires have that ripple in the side at four unequally spaced places. These are rated 85 PSI. But it looks suspicious to me.
Gage accuracy is a big deal. I find most are off at least 5 psi.
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Old 05-04-2008, 03:23 PM   #18 (permalink)
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Now I know it has been said that modern tires resist deforming due to higher pressures, having to do with the steel belts and all, but after raising my current tires to just 45psi Cold I have noticed that I am no longer riding on the full tread pattern. The furthermost tread on the tire is only riding half on and half off the road. I can tell because the tread is darker on the outside and lighter on the rest of the tire.

At what point will this affect my tire wear?
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Old 05-04-2008, 09:20 PM   #19 (permalink)
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Quote:
Originally Posted by MetroMPG View Post
I'd like to correct the terminology a bit: I wouldn't say that was a tire failure at all. The valve stem and tires themselves are physically separate items. Sounds like a valve stem failure, not a tire failure.

---

My Accord also had a set of tires with the "dip" in all four sidewalls. I don't think the Goodyears on the Flea have them though.

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Old 05-05-2008, 11:18 PM   #20 (permalink)
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Quote:
Originally Posted by trikkonceptz View Post
Now I know it has been said that modern tires resist deforming due to higher pressures, having to do with the steel belts and all, but after raising my current tires to just 45psi Cold I have noticed that I am no longer riding on the full tread pattern. The furthermost tread on the tire is only riding half on and half off the road. I can tell because the tread is darker on the outside and lighter on the rest of the tire.

At what point will this affect my tire wear?
Well, you have way more weight on the middle of the tire so it is wearing out faster. Now tires these days last an incredibley long time, the hard slippery tires on my tracker have 65,000 miles on them and might have lost 1/3 of their original depth. Realistically I think tires should be replaced more often so "prematurely" wearing out the middle isn't a bad thing, it gives you an excuse to buy new tires again.
Ian

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