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Old 08-12-2015, 08:39 PM   #71
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Quote:
Originally Posted by crispyboy View Post
The 15" Michelin LTX tire is a P rated tire that doesn't have enough weight rating for bigger trailers. A P rated tire gets derated by 10% in the weight rating catagory.
The 16" Michelin LTX tire is a LT tire and has enough weight rating. Most all LT tires are approved for trailer use and do not get de-rated.
But if your trailer is rated for a max. of 7,300# (which my 2009 25' FB Int. is) it should be ok using the Michelin LTX M/S2 which is rated at 2,183/tire. 2,183 times 4 equals 8,732 pounds. Discount that by 10% and it is 7,858 pounds. More than 500 pounds of margin if you maxed out the gross weight of the trailer (which I don't do). Why would this not work?
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Old 08-12-2015, 11:33 PM   #72
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Read the posts above for your answers.


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Old 08-13-2015, 04:32 AM   #73
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CanAm in Canada installs the 15" Michelins all the time on trailers up to 27' as the GVW is 7.600 pounds. They even install them on the trip-axle units. Our Classic trailer axle weight of over 8,000 pounds camping ready exceeds the 15" Michelin rating of 1,983 pounds.

What one must remember is that the GVW includes the tongue weight. So on our 25FB with a 1,175 tongue weight camping ready, the tailer tires were supporting 6,125 pounds when static. When the weight distribution is applied, the theory is that a third would be on the trailer axles which would add 400 pounds to the load and increase the number to 6,525 pounds.

The photo shows the 15" Michelins mounted on 15" SenDel wheels and installed on the 23D International Serenity. They would be supporting around 5,200 pounds camping ready. They are inflated to 44 psi. They have the Dill TPMS installed along with the Centramatic wheel balancers and McGard lug nuts.

The additional advantage for us was this elevated the 23D to the same height as the 25FB so all the settings and CanAm bent stinger for use with the Mercedes and the 25FB worked perfectly.
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Old 08-13-2015, 07:09 AM   #74
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Quote:
Originally Posted by Hans627 View Post
...... Why would this not work?
Because you forgot to derate the P tires by a factor of 1.1. If you do, then you will realize that the tires are potentially overloaded - and the solution to that is to go bigger.
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Old 08-13-2015, 09:06 AM   #75
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Because you forgot to derate the P tires by a factor of 1.1. If you do, then you will realize that the tires are potentially overloaded - and the solution to that is to go bigger.

He didn't divide by 1.1 but in his reply he took 10% off and noted the 500# spare capacity (with that "discount") on MAX trailer weight - which he assumed would be less than that in a 25 (in my 27fb, it's about 5800# actual on the scales loaded for camping as an example while MAX is 7600).

Was there something missed in his concept? If so, please let me know because I'm doing exactly that (the 15s derated 10% sharing 5800# which leaves more than 25% margin on the derated capacity).

1984 per derated tire *4 = 7936# capacity (call it 7900). I'm using 5800 of that leaving a buffer of 2100# which is >26% margin of the derated capacity using these P tires.

I think we're saying the same thing so if I'm mistaken please (sincerely) help me out! 😳

Thanks!
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Old 08-13-2015, 01:06 PM   #76
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I got that exact combo but in the black accent finish from Discount Tire last month. They were $105 each with a $30 rebate for the four wheels. Tires had a $70 rebate for four. Just take them the part number from Sendel's website and they can order them. Got the road hazard certificates as well. No more junk ST tires for us.
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Old 08-18-2015, 05:36 PM   #77
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I recently upgraded my 2014 Classic to 16" wheels from Treadit and Michelin tires. This was the recommended combo from airstream. What is very confusing is the PSI recommendation from Airstream of 80 lbs. PSI vs Michelin of 55 lbs. PSI. The 80 lbs. PSI is for a individual tire load of 3780 lbs. My trailer maximum load is 10,000 lbs., which is 2500 lbs. per tires if a balanced load. I sent the recommended PSI chart from Michelin nd they stood fast on the 80 PSI recommendation. Am I missing something????
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Old 08-18-2015, 06:06 PM   #78
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I use 68 psi on my 16" Michelins with a 2014 27 flying cloud. I tried various different psi's, but not ever as much as 80, because I felt even 75 was too much, rougher ride on the airstream. Not sure why airstream recommends 80 psi, maybe they don't care if it is going to damage the trailer? Like popped rivets, leaks, etc. However I'm not an expert. Curious to hear what psi others use.


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Old 08-18-2015, 08:31 PM   #79
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Trying to choose which Dill TPMS to order. What size? 0.453" or 0.625"?

1504-416Trailer TPMS Kit, Four (4) wheels, 0.453″ rim hole diameter.1504-572Trailer TPMS Kit, Four (4) wheels, 0.625″ rim hole diameter.
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Old 08-18-2015, 10:15 PM   #80
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I've been running 80 psi for 3 years with the E rated ST Maxxis tires and now 3 years with the Michelin's. No leaks no popped rivets. Airstream is not going to recommend anything less than the max load ratings that appears on the side wall. They have no idea what your trailer weighs when loaded and want no liability if you don't carry sufficient pressure based on your actual weight. Dmnichols according to this Michelin chart, max load on the 16" LTX M/S2 tire is 2680 at 80 psi. I'm not sure where you are getting your info from. http://www.thedieselstop.com/forums/...ok_jan2011.pdf

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Old 08-18-2015, 10:18 PM   #81
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16" wheels

I just put 16" tires on my 2016 RB 25 FC. No modifications needed. Performance Plus was great... put the MS Michelins on. Tires sent mounted and balanced. Sendel rims...t02. talk to Joel... a must upgrade
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Old 08-19-2015, 11:33 AM   #82
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I ordered the Dill TPMS 1503-453 system to use on both the SenDel 15"and 16" wheels.

I have watched the temperatures and pressure change and 75 psi works for us with the 16" tires. Our Classic tongue weight is about 1,200 pounds and the tailer axles are supporting around 8,200 pounds when we are camping ready (or about 2,050 pounds per tire).

We use 44 psi on the 15" Michelin tires for the 23D and also in the prior 25FB.
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Old 08-19-2015, 12:04 PM   #83
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Switz

Not sure what tire you are running but if they are LT225 175 16 with 8100 lbs your tire pressure should be 55 lbs.
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Old 08-20-2015, 12:52 PM   #84
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16" Wheels and Tires

Last week I installed Sendel T03 16x6 wheels and Michelin LTX m/s2 225/75R/16 tires on my 2008 27' FB Classic. They fit perfectly. We are now at the 1/2 way point of our 1500 mile excursion and I am pleased to say the wheels and tires have made a noticeable difference in ease of towing. In fact, on this first half of the trip I have gained 1 mpg over what I normally achieve. I got the wheels from Treadit and they were great to work with, I had the wheels in 3 days. The tires I purchased locally and got a fair price, mounting was included. The tires I replaced were 2 years old to me and looked like new from the outside, Upon removal, it was reveled that the two on the driver side were starting to come apart. It would have been a blow out for sure, probably somewhere on this trip. Thanks to all on the forum that have done such a good job of research and promotion, I feel I am much safer going down the road.
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