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Old 04-30-2011, 11:22 PM   #43
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Caution when increasing PSI

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Originally Posted by Top View Post
I've seen it somewhere. I'm sure 2Air posted a link about it here...
It took some searching, but I finally found the document you spoke of, re the ST Goodyear Marathon Tires rated at 75 mph. Here is a weblink: http://www.goodyear.com/rv/pdf/marat...nfo_032806.pdf


This chart made me think about my wheel's max pressure rating. When I crawled up under my trailer I found the maximum allowed air pressure on my Safari's wheels is 65 PSI, it is stamped on the back sides of the wheels. The tire dealer failed to see this when they recently changed my tires and I did not see this in my trailer's manual.

I wanted to caution anyone else, who may want to increase air pressure in their tire in order to increase that tire's speed rating or if someone has changed from load range D to load range E tires and need to increase air pressure, that they should also check their wheel's maximum allowed pressure.

In order to inflate my new load range E tires to get maximum load rating, I need to go to 80 PSI. The chart is shown at TBC Corporation - Private Brands (Multi-Mile, Cordovan, Sigma, Vanderbilt)

Do any of you have experience that tells me I am going to have a problem with heat build up if I under-inflate my E rated tires to only 65 PSI, the wheels max PSI, in lieu of 80 PSI the tires max PSI?
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Old 05-01-2011, 07:30 AM   #44
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Quote:
Originally Posted by A W Warn View Post
It took some searching, but I finally found the document you spoke of, re the ST Goodyear Marathon Tires rated at 75 mph. Here is a weblink: http://www.goodyear.com/rv/pdf/marat...nfo_032806.pdf


Do any of you have experience that tells me I am going to have a problem with heat build up if I under-inflate my E rated tires to only 65 PSI, the wheels max PSI, in lieu of 80 PSI the tires max PSI?

I bought E rated Towmax tires this past winter at Jackson Centre. Pressured them to about 65 psi and continued on our trip to Tucson and back home to Ontario with no problems whatsoever. I have a TPMS and noted that when the tires heat up, they come up to about 65 psi or a bit higher.

My TPMS also measures temp, although they are just stem mounted sensors so I can't think they are that accurate. Tire temperatures seemed to rise maybe 10 degrees F. or so after a long run at 60-70mph.

My Alcoa wheels, original to the trailer, are rated at 95psi, but I didn't think there was any need to go higher than around 65psi with the load that our
trailer imposes.

I figured that raising the pressure to the maximum for the tire would only subject my trailer to a more harsh ride.

Brian
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Old 05-01-2011, 11:08 AM   #45
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Brian, which TPMS did you go with? I'm looking to buy one.
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Old 05-02-2011, 07:01 AM   #46
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Brian, which TPMS did you go with? I'm looking to buy one.
I went with a system marketed under the name Hawkshead,

TIRE PRESSURE MONITORING SYSTEM

I bought this one mainly because I liked the idea of having sensors with batteries that I could easily replace myself. Also it wasn't quite as expensive as some.

I have had it for several years now and used it on two cross country trips. It works fine.

I did buy an extra signal booster that is just operated by a few AA cells and I locate that in the cupboard over the sofa. I have used the system on at least one trip where I forgot to bring the booster and it still worked fine. It was only an extra $60 though and I wanted to be sure I got a good signal from the cab of our truck to the back axle of the trailer.

Since buying the Hawkshead system, I have seen what appears to be the identical equipt sold under other names.

Having used the system, I wouldn't be without it. There is of course no 100% guarantee that you still might not have a tire blow and rip up the side of the trailer, but I think a TPMS does hedge your bets.

It gives me a little more peace of mind that with the TPMS along with visual check of the tires every time we stop, and replacement at 5 years, I'm doing about all I can!


Brian.
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Old 05-02-2011, 09:39 AM   #47
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Thanks Brian. I think that's the system I'm going to go with also.
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