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Old 03-10-2007, 03:44 PM   #113
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I did not say the tire store over-inflated the tires. I said they inflated them to what see as the specification on the sidewall.

Tires with more plies typically carry higher pressures.

But on the flip-side, many people do not check their tires themselves. Why would the local attendant know or care about the right pressure?

Tom
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Old 03-10-2007, 07:25 PM   #114
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Quote:
Originally Posted by hiker
Isn't it safe practice to check cold tire pressure before every trip? If so, over inflation by a tire store wouldn't be a problem.
I check tire pressures at the start of every day when I'm on the road, but that never gives you the whole story as to what is happening WHILE driving. The best way to keep an eye on the pressures while under way is with a tire pressure monitoring system. I use the Pressure Pro system. Easy to install and will warn you of any drop in tire pressure of 12.5%.....plenty of time to pull over and find the problem.

PM Overlander 68 for more information on this system. He's the resident pressure monitor expert!
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Old 03-13-2007, 03:14 PM   #115
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Quote:
Originally Posted by lewster
I've been investigating 16" rims for my 19CCD with LT225/75R16 Michelins , as I am not comfortable with the Marathons and their 65mph speed rating. I tow 8-10,000 miles a year, mostly out West and need a higher rated tire, especially with a single axel!!

I am now leaning toward the 10 ply Maxxis in 15" to preserve the integrity of the free space in the wheel well. I'll report back when I make the transition.
So we must be talking about the radial Maxxis (aka Cheng Shin Rubber Co, remember the old Swallow motorcycle tires ). The 10 ply is a rating and does nothing but add confusion to the whole discussion. Maxxis also makes a Bias Ply ST tire and I noticed that even on those it's a 6PR or 8PR spec meaning "ply rating" and has nothing to do with the actual number of plys used in the construction.


http://www.maxxis.com/products/trailer/overview.asp

The Maxxis radials are undoubtedly a 2 ply construction like virtually every other radial tire. The ply rating is nothing more than a (bad) way of restating Load Range. The amount of sidewall flex will be way more in a radial than in bias ply. They're designed to flex. I'd bet dollars to doughnuts that even the lowest rated bias ply tires have a stiffer sidewall than the E rated radials.

Sidewall stiffness and ride "quality" don't coorespond as simply as has been put forth in this and other threads. Remember the GM slogan "Radially tuned suspension" and shocks that are labled similarly? At low speed radials were noted to produce a "harsh" ride or what more sporting drivers called "road feel". At highway speeds the radials lower rolling resistance is because of it's ability to absorb roadway imperfections and therefore produces a smoother ride.

In general a lower tire pressure will result in a tire that's able to deform and absorb bumps better. If the road is perfectly smooth then higher pressure will decrease rolling resistance. However, in the real world the deflection caused by higher pressure often results in a higher rolling resistance so it's almost always a compromise that's going to depend on the load, the road surface and the speed.

Just to make things a little more confusing you can't compare load ratings for an LT tire directly to those for an ST rating. The LT tires are derated (or the STs are overrated ) for several reasons. First the LT tires are for passenger carrying service and somehow they figure it's not as dangerous to suffer a blowout on a trailer that may exceed the weight of your tow vehicle . Second the LT tire is rated for use on a drive axle and a steering axle; both of which put more strain on a tire than simply following along (there's nothing in the spec for ST rating that covers backing your trailer). Finally, and it's a major consideration, the LT tires are load rated for a higher, sometimes significantly higher speed. If all tires followed the UTQG system it might be a little easier but there's still a lot of manufacturerer spec engineering and if people saw the UTQG rating for ST tires they probably wouldn't buy them

-Bernie
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Old 03-13-2007, 03:23 PM   #116
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So I'm basically back to square one then....and I guess go with a new set of Marathons? This is like that one joke, you ask one question and get a thousand different answers...all of which sound right on the money....
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Old 03-13-2007, 03:54 PM   #117
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Quote:
Originally Posted by bhayden
... if people saw the UTQG rating for ST tires they probably wouldn't buy them -Bernie
i bernie...

very good post.

and i agree with every thought except this last one.

i REALLY would like to see the UTQG rating for st tires.

virtually everyone mis understands the current st speed 'rating' and mis compares it to passenger tire 'speed' ratings....

cheers
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Old 03-13-2007, 03:55 PM   #118
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Quote:
Originally Posted by bhayden
The Maxxis radials are undoubtedly a 2 ply construction like virtually every other radial tire.
I take it you are speculating like the rest of us are? It does not appear from your post that you have ever owned any Maxxis tires.

Quote:
(... aka Cheng Shin Rubber Co, ...
Was the fact that these tires may be made overseas supposed to surprise anyone? From what I have read, Marathons are not made in the U.S. either.

I don't necessarily disagree with anything you said in your post, but I missed any point you may have been trying to make. Were you trying to make a point?

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Old 03-13-2007, 06:04 PM   #119
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Marathon Failures haven't just happened to Airstreamers

Google Marathon Tire Failures. Read the long list of complaints from owners of SOBs on Eopinions. It has nothing to do with proper inflation. The Marathons are crappy tires and they have been for a long time. Here's an interesting statement I found about a class action suit that seems to have disappeared:

A class-action suit has been filed in Massachusetts accusing Goodyear of
launching a silent recall. The lawsuit claims the tire maker failed to warn
consumers that its 15-inch Marathon tires are unsafe and unsuitable for
campers. (The Associated Press State & Local Wire, November 7, 2000)


I found lots of other postings on other RV message boards that relate tales of woe related to the Marathons. So, no more ruminating over proper tire inflation and weight. The tires are junk no matter how they're inflated.
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Old 03-13-2007, 09:03 PM   #120
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virtually everyone mis understands the current st speed 'rating' and mis compares it to passenger tire 'speed' ratings....

cheers
2air'[/quote]

Even the people who wrote it , the statement contradicts itself.
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Old 03-13-2007, 09:43 PM   #121
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Maxxis Tires

I'm not an expert on tires in any sense but I've read everything I can tolerate here and elsewhere on tires. It took months to come to the conclusion that there is too much bad press on some tires - but I couldn't find any thing bad about Maxxis.

Regarding Discount Tire none of the local shops knew how to get the Maxxis so I called their 800 number on the web and ended up ordering direct from there. The tires 225/75R 15 - 8 ply were 114.50 each direct from the Maxxis website. I ordered them today - 4 tires including delivery and adding their extended warranty was 359.00 from Discount Tire.

With all the opinions out there - hope this was the right call - but made my tire bed so to speak and will lay in it.
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Old 03-13-2007, 09:57 PM   #122
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Quote:
Originally Posted by Ganglin
I couldn't find any thing bad about Maxxis. .
hi ganglin

here ya go with the bad....

i had a side wall blow out on a tubeless maxxis tire in october.

was only going about 12 mph with 35 psi...

blow out and tire separation from wheel. i nearly crashed badly...

it was a bicycle tire.

i'm sure the maxxis ST is a fine tire.

IF there were 6-20 milion of them in service we might read about failures.

i had good results with the marathons...

http://www.airforums.com/forum...ons-27999.html

so you only got 4?

what is your spare

cheers
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Old 03-13-2007, 10:02 PM   #123
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Evil

Oh your evil - and while I refuse to look back now - your humor was well enjoyed..!!
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Old 03-13-2007, 10:08 PM   #124
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Quote:
Originally Posted by Blu_Hwy_Lady
A class-action suit has been filed in Massachusetts accusing Goodyear of
launching a silent recall. The lawsuit claims the tire maker failed to warn
consumers that its 15-inch Marathon tires are unsafe and unsuitable for
campers. (The Associated Press State & Local Wire, November 7, 2000)


I found lots of other postings on other RV message boards that relate tales of woe related to the Marathons. So, no more ruminating over proper tire inflation and weight. The tires are junk no matter how they're inflated.
To keep a proper perspective here.

Note the date of that article. Yes there were bad Marathon's out there but that was some time ago and the date of that article represents tires built in the timeframe of that story. Goodyear did a recall of those bad tires. And as we have pointed out over and over, there are more Marathon's out on travel trailers than any other tire. The universe of these tires is so large, that the law of averages will mean that you will have many more reports of failures than any other tire.

I've had 3 trailers all with Marathon's and have not had a failure to date. As a matter of fact I've lost one tire in over 30 years of towing and that was my own fault from underinflation. I failed to inflate the tire after it sat all winter and in moving it in the drive, broke the sidewall bead wih the wheel.

I consider my success due to keeping the tires within speed ratings, not overloading, keeping pressures at max inflation levels, protecting them from excessive UV, and replacing them after 4 seasons of use, no matter what the tire looks like.

Personally my next set of tires most likely will be Marathon's based on my good experience with the brand. No trailer manufacturer will stake their reputation on a product that would have the impact that defective tires would have. It just doesn't make good corporate sense to do otherwise.

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Old 03-14-2007, 01:29 PM   #125
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Even a blind squirrel finds a nut once in awhile...

And it looks like that's the way it is with somebody who doesn't have a Marathon blow-out. Here are 13 posts on epinion about Marathon tires. Note: there was 1 happy camper and the rest were scathing in their review. Also, note the dates: all within the last 2 years, so it wasn't just the Marathons from the 2000 class action lawsuit.

Here's the link:
http://www.epinions.com/Goodyear_Mar...splay_~reviews
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Old 03-14-2007, 01:51 PM   #126
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Quote:
Originally Posted by TomW
I take it you are speculating like the rest of us are? It does not appear from your post that you have ever owned any Maxxis tires.
I'm going by the information Maxxis provides. If I cared to dig a little further I'm sure I could prove the radials are 2 ply construction. EVERY radial tire I've looked at is 2 ply. I think there are some heavy truck or specialty tires that have more plys but it would defeat the purpose of a radial tire to add plys. People are hung up on "number of plys" and manufacturers have therefore created this "ply rating" that not only makes no sense for radial tires but they now apply this to bias ply tires and give it a "ply rating" that doesn't correspond to the actual contruction of the tire. Thus making it even harder for the consumer to make an informed choice. My point is people need to understand the terminology and NOT ASSUME that "ply rating" means number of plys used in the construction.

I haven't owned Maxxis tires but I have owned Cheng Shin. My experience with them is they're first rate. A lot of people have a bias (no pun intended) against an asian sounding brand name. That's why they came out with the Maxxis brand. Especially when they wanted to move up the food chain in the motorcyle and bicycle tire market. Think it's rough spending $100-150 on trailer tires that only last 3-5 years? Try shelling out $45-50 for a bicycle tire that weighs 180g and lasts one season of racing. Brand engineering is nothing new. Remember Datsun? Once they established a reputation for quality they went back to being Nissan. When they wanted to move upscale they invented Infinity. Unlike a lot of people I have no problem buying a tire from a Chinese company over an American company that builds tires in Thailand, Indonesia, etc. For that matter how is it someone can swear against Goodyear but sing the praises of an identical tire OEM'ed to an independant brand (Goodyear and Cheng Shin both supply a lot of tires to independent brands). Again the point is only to be informed.

Quote:
Originally Posted by 2air'
and i agree with every thought except this last one.

... if people saw the UTQG rating for ST tires they probably wouldn't buy them
Yeah, you are as usual correct. A lot of people would buy them because they meet the main criteria for trailer tires.... They're cheap. A lot of people are buying these tires for boat trailers or utility trailers that get used for short hauls once or twice a year. Or in the case of boats, only when the thing gets sold

While there's a lot of discussion on this list and a group of people interested in educating themselves I'd wager the average customer walking into a tire store is primarilly shopping price. At least that's the impression I get every time I've gone in and tried to get any information from them.


-Bernie
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