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RE: LT tires on your TT? Let the fight begin

More fuel for the fire: 1) People who replaced their ST tires with LT tires increased the effective load carrying capacity .... because: 2) The load carrying capacity of ST tires is calculated differently than LT tires. The result is that ST tires are rated to carry about 20% more load, but at a lower speed.
CapriRacer 02/19/20 06:09am Travel Trailers
RE: New Trailer Tires - And THANKS

I don’t do Facebook. I have done several searches and not one non road hazard has been mentioned. So as a friend tells me please prove with pics and testimony these you mention are NOT roD hazard. To be honest I can’t believe there have been none my self but I have seen nothing along with CapriRacer. I have the pics and they are not road hazard issues they were tire failure themselves as the entire tread has separated from the sidewall. I have posts from facebook and instagram. I would post the pics here but not sure how to from my phone. Can I send them here through a message? When the tread separates from the sidewall, that is a "run flat" - usually caused by a puncture. I've examined thousands of those and 90% of the time I could find the puncture. The other 10% I speculated that the puncture was in the area of the damage caused after all the air was let out - and this was confirmed by Rex Grogan, a noted tire forensics analyst who published a chart showing a study of where punctures occurred in a tire - and 10% were in the junction between the tread and the sidewall. The failure mode of interest is a belt-leaving-belt-separation, as described in the Tire Conditions Manual published by the Tire Industry Association. Tire Conditions Manual This failure is far and away the most common non-road-hazard related failure mode. It is characterized by the tread and top belt detaching in whole or in part, leaving the rest of the casing intact and frequently the tire stays inflated. If anyone has a photo has one of those in a Goodyear Endurance, it would be of great interest. But if someone only has a tread/sidewall separation, that is NOT of interest as that is caused by a road hazard. To date, I have not seen nor heard of any.
CapriRacer 02/05/20 07:25am Towing
RE: New Trailer Tires - And THANKS

Just for my own curiosity what does your data show on the new Carlisle Radial Trial HD? I had these on the previous trailer for about a year without any issues and have not notice any failures mentioned on the forums so just wondering if these tires are better now too. Rob Sorry, but I don't any data. First, my experience was with a major tire manufacturer and we only tracked RETURNS for THAT manufacturer. I retired 7 years ago, so not only do I not have current data on ANY current tire, I don't have ANY data at all. What I have been doing is looking at reports on this and other forums and the one that stands out is the Goodyear Endurance. It's the only one I know of where I can track when it was introduced AND there have been no reports of failures. I am sure that eventually there will be a failure reported because consumers don't know how to discern the difference between a road hazard related failure and a failure caused by the design. (Please note: My experience says that by far and away, it is the design - that is, the materials used and where they are placed - that results in failures and not defects - things that aren't supposed to be there and things that aren't there that are supposed to be.)
CapriRacer 02/03/20 05:05am Towing
RE: New Trailer Tires - And THANKS

Thanks for the reply! You actually felt the tire was credible last year. I have saved some of your comments from the past for the nay sayers! :B First, structural tire failures in the winter months are almost non-existent. The last month where you might see a few is October. They start up again in May. So, yes, I made that prediction in October of 2019 after the season was over. Nothing magical. Just the facts.
CapriRacer 02/02/20 06:15am Towing
RE: New Trailer Tires - And THANKS

At least someone here has decided the ENDURANCE is a credible tire now that it has made it to three full years on the market with stellar results. :B That would be me. Former tire engineer with a major manufacturer who tracked returns and developed algorithms to predict return rates. My experience said that after 2 years in the market, you could predict the return rate for structural failures - which peaked in the third or fourth year. Since no one has reported a Goodyear Endurance ST tire failure in 3 years (They entered the market in the fall of 2016), my prediction is that there will not be any design failures until the tires age out. (We don't know when that will be.) Please note: That even the best designed tire can suffer from road hazards (punctures and impacts) and those types of failures are difficult for the average person to diagnose. Ergo, people will report tire failures and blame it on the make/model tire even if the cause is not tied to the make/model. Been there, done that! That's why we examined every reported failure for root cause.
CapriRacer 02/01/20 06:23am Towing
RE: Goodyear Endurance tires?

The sticker on the side of the camper says GAWR of front and rear are 4400 pounds each. It says the rims are 15x6.0JJ. Does any of this indicate whether or not my rims can handle 80psi? No! It does NOT indicate that. Rims are not required to be marked with max load or max inflation. Some are, and some aren't. - BUT - It is my understanding that it isn't pressure that causes wheels to fail- it is load. So the wheel manufacturers figure out what the max possible loads would be for a given wheel (based on rim width!) and test to that. That should also mean that the wheel can handle the max pressure provided the tire is properly sized for the wheel.
CapriRacer 01/14/20 06:53am Travel Trailers
RE: “Oh Oh, I’m not going to make it” stories that ended well

I've had 2 expereinces, neither of which involved a trailer: I was making a left turn into heavy traffic, accelerating heavily when I realized the car that I was pulling behind had stopped and i was about to hit him in the rear. I pulled into the berm and stop about half a car length further than the stopped car. The car I pulled in front of didn't react strongly enough and hit that stopped car. Luckily, the light turned green and I left the scene. Another was when the clutch cable broke when I went to leave a rest area. I was about an hour's drive from home and managed to get all the way home without having to stop - all the time shifting without the clutch.
CapriRacer 12/25/19 07:10am General RVing Issues
RE: Another ‘dadgum’ post re: tire PSI…please bear with me…

Your math makes sense, and I understand your reasoning. I just wanted to point out that I have heard that you shouldn't go lower than the lowest pressure on the chart, regardless of weight carried. True? I have no idea, just relating what I've heard.;) My understanding is that a tire can generate a lot more cornering force than the pressure to keep the tire seated on the rim at low pressures. In other words, if you run low pressures, there is a risk that emergency maneuvers may cause the tire to come off the rim - and the lower the pressure, the greater the risk.
CapriRacer 12/10/19 07:01am Class A Motorhomes
RE: Continental Tires PSI rising 20

Second vote that the data points don't match: If the pressure goes up, so should the temperature. While I like the idea of reinflating the tires with known dry air (or nitrogen), I'll bet that makes no difference - which would prove my contention that even with known water in a tire, it hardly affects the pressure buildup at all.
CapriRacer 12/08/19 07:09am Class A Motorhomes
RE: Another ‘dadgum’ post re: tire PSI…please bear with me…

Something else to consider is inflating your tire with Nitrogen instead of pain air. Nitrogen doesn't heat up like plain air does. You stated that you F53 handles pretty good with PSI at 80 PSI when you start out, but as your tires heat up the handling changes. I've owned 2 F53 and they both handled badly. Bzzzzzt WRONG! There is virtually no difference between N2, O2, Air and Co2 thermal expansion rates. "I'll take Thermal Expansion for $100 Alex." Geek speak on the subject --> Ideal Gas Law: PV = nRT This formula is the "Ideal Gas Law Formula." Although there is no such thing as an ideal gas the formula is pretty accurate for N2, CO2, and oxygen as we assume that the gas molecules are point masses and the collisions of the molecules are totally elastic. (A completely elastic collision means that the energy of the molecules before a collision equals the energy of the molecules after a collision, or, to put it another way, there is no attraction among the molecules.) The formula becomes less accurate as the gas becomes very compressed and as the temperature decreases but here "very compressed" pressures are well above even the highest tire pressures and "decreased temperatures" are extremely cold, too cold for tires. There are some correction factors for both of these factors for each gas to convert it to a Real Gas Law Formula, but the Ideal Gas Law is a good estimation of the way N2, CO2 and "air" should react through temperature changes. What does all this mean? It simply means that "air", nitrogen vapor, and CO2 vapor should all react pretty much the same within normal tire pressures (0-120 PSI) and temperatures. In the hvac business we use nitrogen for leak down tests under the assumption that it doesn't fluctuate in pressure like compressed air will. However we use pressure way beyond that of a tire (500-600psi). I guess this is within the theory you provided. Why do race car drivers bother to use nitrogen in their tires? Is it a myth? If your HVAC assumes that nitrogen doesn't fluctuate like compressed air, then that assumption is wrong. Nitrogen behaves almost exactly like air. After all, air is 78% N2. Why are you using nitrogen in HVAC? Because it is easy to get in high pressure bottles. The same reason racers use N2. They use those bottles to power their impact guns, so it's readily available. Plus nitrogen isn't Freon, which is expensive. Oh, people will say that they use N2 because it is dry (no water vapor) or that N2 doesn't vary due to temperature, but they have that wrong. It's such a common mistake that it's hard to convince people otherwise.
CapriRacer 11/30/19 07:17am Class A Motorhomes
RE: Another ‘dadgum’ post re: tire PSI…please bear with me…

First, caster is what contributes to straight line stability, so I assume you meant that the caster was moved to 5°. That much camber is only used in racecars. Second, too high a pressure on the fronts tends to cause the tires to follow the ruts and grooves in the road. What you didn't tell us was the tire size and the specified inflation for that size - not what Goodyear's charts say, but what Winnebago's sticker says. I am having trouble with the rear tire pressures being the same as the fronts. That would be a bit odd. And lastly, while this isn't the time of year to really test this out, have you looked at how much the tire pressure builds up after an hour of driving at highway speeds? Rule of thumb say no more than 10%, and at 15% you need more. I suspect you are hardly getting any at all. OK, one more tidbit. When calculating the pressure buildup, you need to back out the pressure buildup due to ambient temperature change. 3% for avery 10°F. That is, if you start the day at 50°F ambient and 80 psi, and measure the buildup later when it's 90°F ambient, 12% of the buildup (about 10 psi) is due to the increased outside temperature, and not due to operating conditions (load in particular.)
CapriRacer 11/29/19 06:38am Class A Motorhomes
RE: What a bunch of junk.

…… One of the most common is the tire/axle GVWR issues. Weight stickers and tires/axles are mismatched. ….. Mmmmmm …...
CapriRacer 11/19/19 06:17am General RVing Issues
RE: Changes in Air Temp and Tire PSI

As a rule of thumb, air pressure in tires incraase about one psi for a temperature increase of 10 degrees F. …... Sorry that only applies to passenger car tires - 30 psi or so. For higher pressure tires use 3% for every 10°F. So for an 80 psi tire, that's 2.4 psi for every 10°F - or from 45°F to 80°F, it's 8.4 psi increase.
CapriRacer 10/29/19 07:18am General RVing Issues
RE: Toyo tires?

I am sitting on a Goodyear problem, near Durant, OK. Bought 7 Goodyear SR-A tires for my 31 ft class C and have had not one but TWO of them bubble out the sidewall - one tire with less than 4,000 miles and another with less than 900 miles (the spare)!!! I need advice on replacing these awful tires right now. Do you mean an indentation? USTMA Service Bulletin: Tire Sidewall Undulations From the Bulletin: Sidewall indentations are a cosmetic characteristic and will not affect the performance of the tire. If bulges, rather than indentations, appear on the sidewall or if there is any question concerning the sidewall appearance, the tire should be examined by a tire service professional. So you may or may not have a problem.
CapriRacer 10/18/19 06:17am Class C Motorhomes
RE: Lowering TV tire pressures

Just an FYI: I spent 5 years as the technical liason from a major tire manufacturer to Ford - calling on the light truck folks. They test their vans, pickups, and SUV's both fully loaded and empty at the specified pressures (the ones on the door placard) for both ride quality and handling. They adjust the springs, shocks, and sway bars to get the vehicle to behave benignly at both conditions - that way the consumer gets a vehicle they don't have to adjust the tire pressures to be confident the vehicle won't misbehave in emergency manuvers and has a reasonable ride quality. They also tested their trucks pulling trailers at the rated towing capacity. I assume that other vehicle manufacturers do the same. So I am confident that using the pressure specified on the vehicle tire placard is what they had in mind for both fully loaded and empty vehicles - unless they specify otherwise in the owners manual.
CapriRacer 10/10/19 06:59am Tow Vehicles
RE: ST Tires ???

Another vote for GY Endurance. They've been around long enough for me and their record is excellent regarding blowouts and failures. The only thing I don't like about them is they are subject to rock mining, where a sharp rock will burrow all the way down to the cords. Most tires wont do this but mine have several places where I can see the silver cords after removing rocks. I have followed this and many other tire discussions and have a question about this comment and those by others. If the Endurance is so good (stellar) after only 3 years why is this rock mining occuring? As pointed out by Capri Racer the 3rd year of a tires' life is when problems may show up and now an issue has been identified. I don't know about others here but if I found a 3 year old tire with cords showing in the thread area due to rocks I would not want that tire on my equipment until the reason is found. IMO the jury is still out. And Scott, I am not picking on you, just using your words to highlight my thoughts. I think you misunderstood what I was saying. I said that when it comes to tires failing from non-road hazard causes, the returns peak in the 3rd summer, but you get a good indication in the 2nd summer. That means that if rock mining is an issue, by the 3rd year some would have failed.
CapriRacer 10/07/19 06:00am Fifth-Wheels
RE: ST Tires ???

…. Only been out 2 years or so? Launched Feb 2017...... My experience analyzing tire returns for a major tire manufacturer says that it is the summer months that matter and that tire failures peak in the 3rd summer, but you get a good indication after the second summer. That means the Goodyear Endurance has experienced 3 summers with no reported non-road hazard failures.
CapriRacer 10/06/19 07:04am Fifth-Wheels
RE: Tires Date

Just so everyone knows: Within the tire industry, there is a common belief that any properly stored tire within 6 years of manufacture can be sold as "New". I say "belief" because I don't know of any data to support this - EXCEPT: The tire manufacturer I worked for tested 3 year old tires out of their warehouse and could find no significant difference from freshly made. So if you are concerned about the age of the tires you purchase, say so up front. It will save a lot of hassle later.
CapriRacer 10/04/19 06:29am Tow Vehicles
RE: Inside Tire Wear?

does it look something like this - https://i.imgur.com/4Cc5lRwl.jpg If so, My Goodyear G614's looked like that as well.. I went to Goodyear and inquired about the issue.. After some looking the manager came up with what they called "Shoulder Step" and deemed it normal for the tire. He even showed me a picture on his computer that looked exactly like my tires. I trust Goodyear, but did not trust that tire wear so I upgraded my stuff to 17.5 G114's and never looked back. What that is is the width of the tread is too wide for the steel belts, so the outer portion of the tread is not as supported as the rest, so it wears faster. It is aggravated by frequent and hard cornering. Nothing to be concerned about except for the appearance. Ultimately it means that Goodyear's design engineers didn't do a great job in the design process.
CapriRacer 09/27/19 06:11am Fifth-Wheels
RE: Tire inflation

Word of caution: Those tire load tables are MINIMUMS!! You should use MORE pressure than the chart indicates. (I recommend 15%) That difference is called "Reserve" and vehicle manufacturers include some reserve when they specify the pressure on the door stick (called the placard). Also, there will be side to side weight variation, so if you weigh only the axles, don't forget to include some factor to account for this. I recommend 10%, but that may be a bit pessimistic.
CapriRacer 09/22/19 07:38am Class C Motorhomes
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