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Old 03-21-2013, 09:13 PM   #449
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Do the centramatics for 15" wheels work on the 16" wheels? I didn't see them for 16".
Yes they do, as long as there is a 10 inch flat spot on the back side of the wheels.

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Old 03-21-2013, 09:41 PM   #450
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I have them on our trailer with 16" wheels/tires, but how would you know if they are really doing anything?
Real easy.

Does stuff stay put in the trailer, and what kind of tire wear do you have, or not have.

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Old 03-21-2013, 11:17 PM   #451
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Centramatics fit 16-inch, Sendel T02's. Our XPS Ribs are a little over two years old with about 15-18,000 miles on them; and they look almost new, with very little wear.

We leave large sea-salt and pepper grinders in a wrought iron caddy on the dinette table (on a rubber, non-skid mat) while traveling; and they do not tip over, move around or fall off on the floor. The same with the liquid hand-soap pump, etc., by the bathroom sink.
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Old 03-22-2013, 08:03 AM   #452
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Like I said, we have the Centramatics with 16" wheels/tires, and stuff flies all over the inside of the trailer, draws keep opening, sliding closet doors keep coming off their tracks, and I have had to reinstall the rear sliding bedroom door twice.

Is this because of, or in spite of the Centramatics?
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Old 03-22-2013, 12:38 PM   #453
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Michelin LTX M/S 2 or M/S

I've been shopping for tires to go with my new Sendel T03 wheels.
Does anyone know the difference between the 16" Michelin M/S and M/S 2.
The tire salesman says the M/S 2's are replacing the M/S, and have a longer tread warranty. However, it seems most people on the forum are using the Michelin LTX M/S 225/75 R 16 load range E, not the M/S 2. Any advise on my upcoming purchase.
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Old 03-22-2013, 12:51 PM   #454
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Centramatic, within reason, take care of unbalanced running gear.

Centramatics do not compensate for excessive rated tow vehicles or excessive rated hitch bars.

Andy
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Old 03-22-2013, 02:59 PM   #455
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Originally Posted by SteveH View Post
Like I said, we have the Centramatics with 16" wheels/tires, and stuff flies all over the inside of the trailer, draws keep opening, sliding closet doors keep coming off their tracks, and I have had to reinstall the rear sliding bedroom door twice.

Is this because of, or in spite of the Centramatics?
Don't forget the driver as one of possibilities Steve. Isn't Texas the state with the 85 speed limit on some highways?

We've had things open and things move, but it must be when Barb is driving. There appears to be less of that with Centramatics.

The M+S 2 wasn't available when we got our Michelins, so that may be why some people use M+S.

Gene
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Old 03-22-2013, 03:10 PM   #456
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Yes, Gene, Texas has some highways with speed limits up to 85, but I don't tow that fast. Really.

I try not to exceed 65 with the trailer.....try.
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Old 03-22-2013, 04:00 PM   #457
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Centramatic, within reason, take care of unbalanced running gear. Centramatics do not compensate for excessive rated tow vehicles or excessive rated hitch bars.
Andy
Or worn out parts.

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Old 03-22-2013, 04:54 PM   #458
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Is this because of, or in spite of the Centramatics?
An interesting experiment would be to use an accellerometer app such as https://play.google.com/store/apps/d...erometer&hl=en

Drive the same route, at the same general speed, with and without the centramatics. I agree that driving style, as well as the roads typically driven, will have a lot to do with what moves inside the trailer. A bumpy road or a gas station driveway will likely create enough rocking to move things around, regardless of wheel balance.
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Old 03-22-2013, 06:36 PM   #459
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ST225/75R15 Load Range D Tires

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...
Third, I'm a fan of going larger when it comes to trailers and tires. I like the idea of going from an ST225/75R15 Load Range D to an LT225/75R16 Load Range D (or E, but at 65 psi.), but the clearance has to be checked.

So without any additional info, I would advise you to go for the 16" option.
Can you be more specific as to why you favor this type of change?

I read about the GYM ( and other brands) complaints from those using the ST225/75R15 Load Range D tires and compare these to our experience with the GYM ST225/75R15 Load Range D tires on our 2006 model year 30' Classic and come away confused. Our trailer is in its eighth year of usage (and second set of tires) with zero tire problems.

Is the reported ST225/75R15 Load Range D tire failure problem a very complex problem, or is it more of a combination of loading, towing speed, tire pressure, etc.?

Please, no rants from those that have experienced tire failures on the ST225/75R15 Load Range D tires.

We tow at 55 mph, monitor tire pressure and temperature, and know that our trailer weight is well below the 10,000 pound GVWR rating for this model.

I really don't want to change to 16" rims if the ST225/75R15 Load Range D tires are satisfactory under the conditions under which we use our trailer.

Are there many other owners out there that have experienced what we have with the ST225/75R15 Load Range D tires?
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Old 03-22-2013, 07:32 PM   #460
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Does anyone know the difference between the 16" Michelin M/S and M/S 2?
I've been planning this change (to 16" wheels & tires) for over a year and during that time Michelin has migrated the new production 225/75R16 LRE tires from the M/S design and rubber compound to the M/S 2. As previously mentioned, the M/S 2 is an evolutionary change of the basic M/S series and is supposed to be an incremental improvement.

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Old 03-22-2013, 08:10 PM   #461
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OK, being the nerd/retired engineer that I am, I've also pulled the comparison information from the Michelin website on the M/S2 Versus the M/S tires. Open the attachment if you're interested.

Note: I had converted this file to a .PDF type, but Air Forums says that I have a missing security ket (or something like that). That's frustrating as I realize that not everyone has Microsoft Excel.

Steve
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Old 03-23-2013, 06:33 AM   #462
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Can you be more specific as to why you favor this type of change?..........Please, no rants from those that have experienced tire failures on the ST225/75R15 Load Range D tires........
I had a college professor who used to say: "Over-Design, Under-Utilize!"
- which is a short way of saying that responsible engineers should design components stronger than they need to be - AND - then select components stronger than they need to be. The net effect is that there are 2 jumps in strength.

This is one of the lessons from the Ford/Firestone thing a few years back. Remember all that talk about inflation pressure? That was really about load carrying capacity.

If you look at successful vehicle designs (from the tire failure perspective), the thing that stands out is that these vehicles have relatively large tires (compared to what is needed.) Over the years I have become aware that many trailer manufacturers don't do a good job of sizing the tires. In essence, this is the same problem as the Ford Explorer's inflation pressure.

So I am advocating using a larger tire - and in this case, moving from a 15" to a 16" increases the load carrying capacity by 6%. Plus, it moves from ST tires to LT tires.

OK, the ST tire problem: I see 2 issues here. The first is that these tires are produced by - oh, let's call them 3rd tier manufacturers - with the one exception and in that case I would characterize these tires as being built with 3rd tier equipment. Maybe a better way of saying this would be that they aren't benefitting from cutting edge technology - unlike LT tires.

I could say the same thing about LT tires coming from 3rd tier tire manufacturers, but getting evidence to support this is difficult. Failure rates aren't published - and even hints at the rate are especially hard to find for obscure tires - and pretty much all ST tires qualify as obscure.

The second problem I see with ST tires is that they are speed limited - something that isn't understood by the novice RV'er - and because of that, they are allowed a more intense loading.

Combine these 2 things, and it is understandable that the failure rates would be higher.

So that's what is underlying my recommendation.
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