Tire Replacement intervals???

[Mudfrog]

Originally Posted by Philswrench

If you are going to run max pressure , you should make sure to set your max pressure with the tires hot and carrying the weight you normally carry

Please, do not follow this advice!

Most tires have it stamped right there on the sidewall, the "cold" psi required for maximum load.

[vincee]

Ok class, Philswrench has to stand in the corner for not paying attention, LOL

[Crasher]

Originally Posted by Philswrench

If you are going to run max pressure , you should make sure to set your max pressure with the tires hot and carrying the weight you normally carry

WOW, where did that idea come from? If I were to do that, the cold pressure on the steer tires would be at least 10 psi below the minimum required to carry the load. A failed tire would be in my future.

It's the false information like the above, that some people actually believe, helps confirm to me that at the very minimum there should be a written test or certification for the most basic safety issues needed for operating a motorhome. To drive a commercial delivery truck, one must pass a written and driving test. Yet, someone who has never driven anything but a car can drive off a lot in a class A motorhome. All he has to know is how to start it and shift into gear. Is it just me or is that crazy??

[Monacoach]

Check your weights in the tire charts and subtract 50 lbs for heat expansion ha ha.......

[Dtwallace]

Originally Posted by CountryFit

bingo
my coach manual says front 120 psi, rear 110 psi.
my tire wall prints minimum 120 psi cold to support xxxx lbs of load.
i keep front 120 psi, rear 115 psi.
it has been good since 6 years ago.

I hate these tire discussion threads because we make this so much more complicated than it is.

How is it for years, (OTR) truckers have survived without racking their brains over this topic???? Could it be by just reading and following the numbers on the side of the tire? Works for me, and has for years.

As for age of your tires, the condition, and whatever it takes to mitigate the chances of major damage to your coach, or what minor damage are you willing to accept to you truck.

DTW

[Dtwallace]

Originally Posted by Mr_D

The pressure on the side of truck type tires is not the maximum cold pressure. It is the minimum cokd pressure to support the maximum ration of the tire. The design takes into account the pressure build up due to heat. That's the reason all pressure recommendations are for cold pressure. NEVER reduce pressure on a hot tire, you'll be too low when cold.
What I'm posting comes directly from the tire manufacturers manuals, please read them.

It's sad that so many will put on the blinders and not take this advice.

[Dtwallace]

Tire Replacement intervals???

Quote:
Originally Posted by slemnah
RU499, as an ASE Master Technician I would strongly recommend that you lower the tire pressures to the recommended pressure or to the pressure weight table recommendations. The tire pressure will increase quite a bit when the tire gets hot and you will be severely overinflated. Please google Motorhome tire inflation. You are putting yourself and others at risk. You have been very lucky If you have a 10y/o tire with max pressure and haven’t had a problem.


... sigh...,

My confidence in ASE trained personnel is slipping. Running tires at max cold psi, as stated on the sidewall, will not put anyone in danger nor will the tires be overinflated. Yes, tire pressure increases when the air inside gets hot. Tire manufacturers know this, which is why they state max COLD psi. This is tire-101.

Surely you have been told this, being a master tech and all. New to the tire world?


I had to delete my first response to this (ASE trained tech).

Too hard to keep it clean and respectful.

[Mr_D]

Originally Posted by Dtwallace

It's sad that so many will put on the blinders and not take this advice.

Yah and too bad I didn't spell check before posting!

The pressure on the side of truck type tires is not the maximum cold pressure. It is the minimum cold pressure to support the maximum rating of the tire. The design takes into account the pressure build up due to heat. That's the reason all pressure recommendations are for cold pressure. NEVER reduce pressure on a hot tire, you'll be too low when cold.
What I'm posting comes directly from the tire manufacturers manuals, please read them.

[lancslad]

Originally Posted by Wdeertz

I have a 2 year old Class A that I’ve put about 22k miles on. My intent has always been to wear the tread out before the rubber goes bad. Your reply implies that the tires are good for 80k-100k miles, is that correct?

With regular use how many miles can I expect from steel belted RV tires on a 18k pound Class A? I have Goodyear RV tiires from the factory on my Ford F53.

Thanks

In my experience your factory Goodyear tires can blow at any time!!! My 1st was at 16000 miles. It was also my last. In 2 weeks all six were history.

[OldToolmaker]

Originally Posted by Monacoach

Its funny you mention caveman because with this discussion about running at the max stamped on the tires I was thinking the ride would be like Fred Flintstones car with cement wheels

In 1950 Chrysler cars came with Goodyear CushionAire tires and the recommendation to run them at 24 PSI. In 1950 frame flex was a major part of suspension effectiveness.

In the 21st century we rely on springs.


P.S. When in doubt use the maximum recommended cold tire inflation pressure. Underinflated tires overheat and become damaged, and you can't heal them with increased tire pressure.

[BAMA BASSER]

WOW, so many dumb advises about tire pressures!!!!, The original question was how many years before changing tires? If you cain't read tire pressures on your sidewall from the MFG, you need to take it to a tire store and let them pressurize your tires.

[Crasher]

Originally Posted by BAMA BASSER

WOW, so many dumb advises about tire pressures!!!!, The original question was how many years before changing tires? If you cain't read tire pressures on your sidewall from the MFG, you need to take it to a tire store and let them pressurize your tires.

You will soon learn that when a "Tire" post is started, it becomes fair game for anyone that has an opinion related to tires. Seldom does it just answer just the original request without adding all kinds of somewhat related opinions and sometimes "Facts" that aren't really facts at all, but opinions that have been repeated enough times to take on the appearance of a fact.

Not sure what to read into your above response. I'm not sure which "Dumb" advise you are referring to. Are you one of those that inflates the tires to what is stated on the sidewall regardless of the weight it is carrying or do you weigh each location and inflate per the load inflation tables supplied by the tire manufacturers? Just curious.

[fottip]

Originally Posted by BAMA BASSER

WOW, so many dumb advises about tire pressures!!!!, The original question was how many years before changing tires?

Yep. This question is one that comes up often, and the opinions expressed are all over the place. One has to be careful about following the advice given, some of which is simply heresay and uninformed at best.

First, the advice about "inspecting tires". Easy to look at them outside. But, inside? Who looks INSIDE the tires, to see if there's cracking or other wear signs in there? Answer: Obviously, it's not something owners can do.

What about the air that's been put into the tire in its lifetime? Ambient air contains moisture, and moisture pumped into tires contributes to deterioration of the tire carcass from the inside. That's a valid concern, one a lot of people don't consider. In my home shop air system, I have dessicator filters to capture moisture to prevent it from entering my tires when I air them up.

Bottom line for me: I've already experienced a front tire blow-out on a Diesel pusher class A, at 65mph, and business picked up briskly when that occured - the trip was ruined, with significant damage to the coach, as a result. Tires were 7-8 years old, and looked GREAT on the outside.

MORAL: Tires that look "GREAT" ouside are no guarantee everything's fine.

Conclusion: 5 years is my replacement interval, regardless how "good" the tires look outside, and how well I've cared for them.

Never again, hopefully.

And for "Crasher": No, I'm not one of those who "inflates the tires to what is stated on the sidewall regardless of the weight it is carrying".

I own the same "43 QGP" bus as you, and, having been in communication with the Tiffin Chassis Plant Mgr Gary Harris, I use the tire pressures he recommended, and they're different for each of our 3 axles, not "what's stated on the sidewalls".

[Robontheroad]

Thanks fottip for bringing the thread back on track. Your experienced input is appreciated. I would also rather change tires early if it will help avoid a blowout.