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Re: Can someone explain the dogma against P tires ? [message #371040 is a reply to message #371039]

Tue, 31 January 2023 18:24

Richard RV

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Registered: July 2012
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rjw wrote on Tue, 31 January 2023 17:47

Wes also was firm in his belief that the XPS RIB tires had to be inflated to 80PSI. Early on (1998) I followed his advice as did the PO. The ride was quite rough and and steering was worse.

Every tire manufacturer has a tire pressure chart based on the tire's load. From what I've seen most are almost exact duplicates, so I'm guessing DOT has a requirement that the tire manufacturers must adhere to hence the same load:pressure ratios.

I've helped with a number of coach weighings at rallies, and ride height and individual tire weights are recorded.

One stretched coach had the front axle clock in at 5700#. That exceeded the GMC's front axle rating of 4700# by a thousand pounds - more than 20%. I mentioned to the owner that his coach was seriously overloaded and he should at the very least be running higher tire pressure. The owner was running all his tires at 65 psi because someone told him that's good for GMCs and "that was good enough for him". Rolling Eyes

TL:DR Weigh your coach and run your tires at the correct pressure per the manufacturer's chart. The ride and handling characteristics will be better.

Richard

'77 Birchaven TZE...777; '76 Palm Beach under construction; ‘76 Edgemont waiting its turn

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[Message index]

		Can someone explain the dogma against P tires ? By: hertfordnc on Mon, 30 January 2023 07:09
		Re: Can someone explain the dogma against P tires ? By: Richard RV on Mon, 30 January 2023 11:35
		Re: Can someone explain the dogma against P tires ? By: lqqkatjon on Mon, 30 January 2023 17:08
		Re: Can someone explain the dogma against P tires ? By: JohnL455 on Mon, 30 January 2023 18:40
		Re: Can someone explain the dogma against P tires ? By: hertfordnc on Mon, 30 January 2023 21:31
		Re: Can someone explain the dogma against P tires ? By: Larry on Tue, 31 January 2023 06:58
		Re: Can someone explain the dogma against P tires ? By: Larry on Tue, 31 January 2023 07:03
		Re: Can someone explain the dogma against P tires ? By: RF_Burns on Tue, 31 January 2023 09:30
		Re: Can someone explain the dogma against P tires ? By: Larry on Tue, 31 January 2023 15:01
		Re: Can someone explain the dogma against P tires ? By: Matt Colie on Tue, 31 January 2023 09:46
		Re: Can someone explain the dogma against P tires ? By: hertfordnc on Thu, 02 February 2023 12:27
		Re: Can someone explain the dogma against P tires ? By: mghamms on Fri, 03 February 2023 11:10
		Re: Can someone explain the dogma against P tires ? By: JohnL455 on Tue, 31 January 2023 10:29
		Re: Can someone explain the dogma against P tires ? By: rjw on Tue, 31 January 2023 16:47
		Re: Can someone explain the dogma against P tires ? By: Richard RV on Tue, 31 January 2023 18:24
		Re: Can someone explain the dogma against P tires ? By: mghamms on Wed, 01 February 2023 09:40
		Re: Can someone explain the dogma against P tires ? By: JohnL455 on Sat, 04 February 2023 09:43

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