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Old 05-02-2013, 01:16 PM   #21
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Am I missing something, my D rated tires run with 65 psi?
No D rated is 65. My C rated are max 50 psi.
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Old 05-02-2013, 01:22 PM   #22
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No D rated is 65. My C rated are max 50 psi.
Don't understand, No D rated is 65, are you implying that D rated is not 65?
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Old 05-02-2013, 01:35 PM   #23
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One of the main reasons for using nitro is that it is not affected by temperature change. This is why it is used in racing tires. All the research I have done says it won't hurt but don't waste your money. If pressure drops you can simply add compressed air. I used nitro when I was a refrigeration mechanic to leak test because it was not affected by temperature, and a drop in pressure meant a leak in the system, not simply a drop in temperature.
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Old 05-02-2013, 01:35 PM   #24
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Don't understand, No D rated is 65, are you implying that D rated is not 65?
Saying d is 65, c is 50 and e is 80.
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Old 05-02-2013, 01:55 PM   #25
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The only tires that NEED nitrogen are those on jet airplanes. When I was at Boeing, I researched landing gear tire bursts. In the early 1960s there were several accidents that resulted from in-flight bursts of retracted tires, one with 70 fatalities.

The research showed that, if an airplane took off after taxying a long way with a dragging brake, there was a risk of either an over-pressure burst or a tire explosion in the first hour of the flight. We had a 727 case where the tire exploded from gases being released from the rubber compound and then spontaneous combustion. Analysis of the failed tire bead steel cords indicated a pressure of about 12,000 psi!

If your rig can do 150 mph for a couple of miles (with a dragging brake) and then retract the wheels, by all means spend the extra.
The landing gear tire bursts were not the only reason. The FAA issued Airworthiness Directive 87-08-09 requiring nitrogen to be used to prevent explosions resulting from overheated brakes and the subsequent explosions.
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Old 05-02-2013, 01:59 PM   #26
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you mean no one else changes their air from summer to winter? just BURST my bubble!!!!!!!!
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Old 05-02-2013, 02:00 PM   #27
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you mean no one else changes their air from summer to winter? just BURST my bubble!!!!!!!!
Sorry
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Old 05-02-2013, 02:19 PM   #28
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I'll let them down to 50 psi tomorrow. Meanwhile, Old Coot, I'll make sure not to jar them. Thanks for the advice.
Collect the air in a bag and then hook it up to your compressor inlet when you fill again, and you can recycle it. I wish they would use helium so that our rigs were lighter. Or maybe nitrous oxide so we could laugh while we fill.

LOL

I LET 5psi out of mine and felt a little guilty.
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Old 05-02-2013, 02:23 PM   #29
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I was surprised with the pressure change while driving, went from 50psi cold at start of trip, up to 60-61 psi after driving for a couple of hours. This was according to my TST tpms system..
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Old 05-02-2013, 03:37 PM   #30
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Air pressure changes about 1psi for every 10 deg of pressure. So if your tires were at 70 deg F to start they were at 170 deg at the end. What did your TPMS say about temps?
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