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Old 07-21-2014, 09:47 AM   #15
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Everyone talks about Airstream maximum load rating on the tires. Do not forget the wheel bearings and springs figure into axle load ratings.
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Old 07-21-2014, 10:52 AM   #16
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Just put these on at about 50psi and not worry about them for about 9yrs.
http://www.tirerack.com/tires/tires....rtnum=700R5215
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Old 07-21-2014, 08:42 PM   #17
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Just put these on at about 50psi and not worry about them for about 9yrs.
http://www.tirerack.com/tires/tires....rtnum=700R5215

I noticed those as well, but wondered about using them in near freezing temps. Being in KY we have plenty of dry, yet cold days at or below freezing. I had read somewhere that these summer highway ribs aren't to be used in near freezing temps. Is this a real concern?


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Old 07-21-2014, 09:02 PM   #18
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I noticed those as well, but wondered about using them in near freezing temps. Being in KY we have plenty of dry, yet cold days at or below freezing. I had read somewhere that these summer highway ribs aren't to be used in near freezing temps. Is this a real concern?


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Only if your out 4wheeling in your pickup. They will work just fine for a trailer and they are better than the tires that were on your trailer when it was new. No tire is going to get traction on ice, stay home.
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Old 07-21-2014, 09:11 PM   #19
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Fair enough. Just as long as they don't get slick in cold temps. What's the reason for the "summer" designation anyway?


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Old 07-21-2014, 09:41 PM   #20
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I would think they can take the heat. They are a highway rib tread tire, if you need an all season tire maybe look at another tire.
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Old 07-22-2014, 01:02 AM   #21
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Re: Differences between "Rib" (summer) & "M/S" (all season) tires

"Rib" tires (e.g., Michelin XPS Ribs and BFG Commercial T/As) are made with hard rubber compounds and closed-shoulder tread ribs, and are designed for the summer heat (see first tread photo, below). They tend to wear evenly and grip well on dry roads, and they channel water pretty well in the rain. In addition, the rib tread design also runs quieter than more aggressive patterns. While the harder rubber compound and rib tread design (with very few sipes) lasts long and wears evenly during the summer heat, Rib tires perform poorly on drive wheels in sub-freezing weather, and on snow and ice.

"M/S" tires (e.g., Michelin LTX M/S2) are "all season" tires made with softer rubber compounds that are more flexible in cold weather. The tread design is a compromise between summer and true winter (snow) tread patterns; and these are popular for many vehicles where winter driving conditions do not dictate the use of "snow tires". These are also the tires that come on Eddie Bauer models and are offered as optional equipment by the Airstream factory.

The last tire photo is the Michelin LTX A/T2, an "all terrain" tire. Of these three tires, it has the softest rubber compound and most aggressive tread design. As a result, it is the one most susceptible to uneven wear; and as the tread wears down, it is also the one most likely to exhibit the rumble typical of snow tires, when run at highway speeds.

For reference, I have also included the "summary" tables from www.tirerack.com; so that you can compare the performance differences between these three types of tires. Hopefully, this information will help members in selecting the type of tire that best fits their driving conditions and needs.

Photos:

• Michelin XPS Rib Tire Performance Rating Summary

• Michelin LTX M/S2 Tire Performance Rating Summary

• Michelin LTX A/T2 Tire Performance Rating Summary

• Michelin XPS Rib tread

• Michelin LTX M/S2 tread

• Michelin LTX A/T2 tread

Note: I have no affiliation with Tire Rack. I just find that their Website is easy to navigate, and it presents information in a logical format.
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Old 07-22-2014, 03:32 AM   #22
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Note: The BFG Commercial T/A was mistakenly included in the description for "Rib" tires. It should have been included under "M/S" tires.
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Old 07-22-2014, 06:33 AM   #23
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Great post! Thanks Phoenix.


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Old 07-22-2014, 08:24 PM   #24
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I attempted to get 4 Yokohama Ribs today, but unfortunately they are on a national back order. I found one online store that has some in stock, but when I called they refused to look into the DOT date for the tires. The response I got was that it didn't matter since the tires have been stored in a warehouse. So no luck there.

My next option was the Goodyear Wrangler HT, but when I checked with my local shop they were ridiculously priced (even more than the ribs). Consequently, I'm just go to get something to get me through my upcoming trip, which isn't much driving time at all. My shop can get me 215s in either a load range D trailer tire, or load range C Light Truck tire. I suppose it's a toss up. I know 225s are preferred, but being my wheels are 5.5 inches wide I am limited, unless I ignore the recommended minimum of 6" for a 225 or 235.

This is definitely motivation to get new wheels when I upgrade my axles hopefully next summer. Moving to a 6 inch wide wheel in either a 15 or 16 definitely gives many more options. Along that note, there appear to be a number of 235 75 R15s available with the XL rating, which cost significantly less than 16 inch tires. A quick search on tirerack.com showed 16 different ones, although I imagine some are more geared for off-road use. That said, with several 15" XL tires to pick from, what is the main benefit of bumping up to a 16" wheel?





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Old 07-24-2014, 07:27 AM   #25
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.......what is the main benefit of bumping up to a 16" wheel?
One of the ways to reduce the risk of tire failure is to increase the load carrying capacity. Going from a 15" to a 16" is directionally better.
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Old 07-24-2014, 05:15 PM   #26
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With an increase in load carry capacity, doesn't the firmness of the ride also increase?


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Old 07-24-2014, 10:47 PM   #27
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With an increase in load carry capacity, doesn't the firmness of the ride also increase?


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Absolutely.

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Old 07-25-2014, 04:58 AM   #28
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With an increase in load carry capacity, doesn't the firmness of the ride also increase?


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Simply put, maybe.

The spring rate of a tire is closely tied to the inflation pressure.

So increasing the load carrying capacity by increasing the inflation pressure results in a harsher ride. But an increase in load carrying capacity by increasing tire size wouldn't necessarily increase ride harshness (unless the inflation pressure also increases.) In fact, the increased mass of the tire might help the ride harshness.
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