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Old 02-28-2016, 06:06 AM   #71
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Quote:
Originally Posted by ROBERTSUNRUS View Post
Hi, after decades of working at new car dealers, we determined that "New doesn't mean good". Parts for your car, truck, trailer, or even your house can be defective.
True enough, Bob, but in terms of risk management, we prefer new 16" M&S Michelins over slightly used 15" OEM tires on our new single-axle FC20 -- with the upgrade package to include Sendel wheels, Centramatics, tire pressure sensors, etc.. This package deal is superior to the existing 15" setup in our opinion.

Risk management plus an upgrade in capacity and safety.

Could the new Michelins be defective? Of course.

Thanks for your feedback.

Peter
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Old 02-28-2016, 08:05 AM   #72
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How to know when to replace tires

Peter (OTRA15), I'm going to replace with Michelin's in April. With plans to put about another 8,000 miles on my AS beginning in May, the peace of mind is well worth it to me.
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Old 02-28-2016, 08:08 AM   #73
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I bought my Michelins for $163 a piece from this company:

http://www.4wheelparts.com

Free shipping, no tax. I hope they are not old or made in China, much better price then anywhere else.
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Old 02-28-2016, 10:33 AM   #74
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Sounds good Barretta2!
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Old 02-28-2016, 11:11 AM   #75
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Best Time to Buy.

IMHO, the best time to buy new tires is when you look at yours and "Made in China" is stamped on the sidewall! Take it from someone who is "Nearly Famous!"
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Old 02-28-2016, 12:58 PM   #76
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IMHO, the best time to buy new tires is when you look at yours and "Made in China" is stamped on the sidewall! Take it from someone who is "Nearly Famous!"
I second that.
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Old 02-28-2016, 04:50 PM   #77
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Quote:
Originally Posted by OTRA15 View Post
True enough, Bob, but in terms of risk management, we prefer new 16" M&S Michelins over slightly used 15" OEM tires on our new single-axle FC20 -- with the upgrade package to include Sendel wheels, Centramatics, tire pressure sensors, etc.. This package deal is superior to the existing 15" setup in our opinion.

Risk management plus an upgrade in capacity and safety.

Could the new Michelins be defective? Of course.

Thanks for your feedback.

Peter

Hi, the best bang for your buck is the Centramatics.
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Old 02-28-2016, 08:56 PM   #78
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Hi, the best bang for your buck is the Centramatics.

I just put mine on for the first time. Anything special about bolting them down?

I have aluminum wheels, so I know that I need to re torque the lugs at 50 miles.
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Old 02-29-2016, 09:51 AM   #79
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Tube ring goes inward around the brake hub. Verify the plate fits flat against the bolting surface. They will fit reversed with some wheels, but work better if oriented inward. Pat
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Old 03-01-2016, 12:01 PM   #80
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Keep checking with your favorite tire store for the Michelin 15" XL series tires. Michelin has discontinued all but one 14" tire and despite the three new 15" tires this spring, that size will be next on the chopping block.

This cheery news was from the tire manager at my local CostCo today.

There is no mechanical way to fit a 16" Michelin tire on our 23D. The 15" Michelin was a snug fit. So next year, I will start checking for any negative news on 15" Michelin availability and will order in a set before they vanish.
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Old 04-09-2016, 05:40 PM   #81
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After reading all of this, I think I'll just stay home.......
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Old 04-09-2016, 06:27 PM   #82
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Your a smart man. Too funny. It's hard to know for sure. You would think the stock tires should last a few years but that's just not the case anymore. I have not replaced mine yet but I'm looking.


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Old 04-10-2016, 06:44 AM   #83
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So the placard on the side of the AS says to inflate tires to 65 PSI cold. Let's say the outside air temp (before sunrise, and as "cold" as it gets during the summer here) is 82 degrees. Then, I read the sidewall of my tires and it reads "max load at 65psi" and whatever the number is. My assumption is that I should never inflate past 65psi.

Now I go to my truck... my placard says to inflate to 35 psi cold. I look at my sidewall and it reads "max load at 45psi" X. It might even be higher than that honestly.

While I understand that the writing on the sidewall is a load rating at a given pressure, not necessarily an indicator of what the tires should be inflated to, I would also think that the higher the PSI, the higher the load it could handle and therefore the manufacturer would choose the highest safe PSI.

Now we go down the road at 65mph... At 3pm with an OAT of 100F. And of course nobody never goes past 65. I wonder what that PSI is in that tire at this point? For reference, my TPMS system in my truck says 41 PSI a 15% increase. If my AS tires went up proportionally, that leaves me at 75psi. Oh, by the way, my truck tires are nitrogen filled so they didn't go up as much as air filled tires will.

Looking at the Goodyear Load Inflation Charts, it doesn't even show a PSI past 65.

Two questions:

1) Is my assumption correct that the max PSI for the Marathon 15's is 65PSI?

2) Under these conditions, should I be surprised if a blow out a trailer tire? If yes, should I blame the manufacturer?
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Old 04-10-2016, 08:42 AM   #84
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First, the maximum inflation pressure for a Goodyear Marathon isn't always 65 psi. For a Load Range C, it's 50 psi, and for a Load Range E it's 80 psi. It's 65 psi for a Load Range D.

Second, Rule of Thumb: For every 10°F rise in temperature, your inflation pressure will rise 3%. So for a 30 psi tire, that's ~ 1 psi for every 10°F (you will find that quoted elsewhere, usually without the qualification that it only applies to passenger car tires.)

For a 65 psi tire, going from 82°F to 100°F is 18°F =~ 3 1/2 psi.

Please note that the maximum pressure stated on the sidewall of a tire is a *COLD* pressure. The tire is designed to allow for pressure buildup due to the heat of operating beyond the maximum stated on the sidewall.

- BUT -

Another Rule of Thumb: You don't want to see any more than a 10% rise in operating pressure. That indicates the tire is being operated underinflated, overloaded or too fast. You need to take care of that - usually by going to a larger size tire or a higher load range.

But if you see 15% (or more) , you need to take care of that IMMEDIATELY!!!

And lastly, blowouts can occur for various reasons. The most obvious is debris on the road. Even small nails, can cause a tire to lose enough air to blowout - and unlike a car where you can hear or feel a tire going down, you won't know about your trailer tire until it has destroyed itself.
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