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Old 06-07-2016, 12:18 PM   #57
Rivet Slave
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2014 27' FB International
Western WA , Washington
Join Date: Dec 2013
Posts: 2,187
Blog Entries: 49
Originally Posted by Rocinante View Post
I just heard back from Michelin customer care regarding availability on the new Michelin Defender LTX M/S tires in the size 235/75R15 109T:

"Thank you for your email and your interest in the Michelin Defender LTX M/S tires. Since this is a new tire line some of the sizes are not yet available. Our records indicate that size 235/75R15 will launch on the first week of June. This means that dealers should be able to place an order at that time."

The last time I asked, Michelin gave me an "end of March" date. <sigh>

Oh, and like many others, when I called Costco to ask about putting these on a trailer they said two things, which I've paraphrased: (1) we don't work on trailers though we can mount the tires on rims if you bring them in, and (2) if you bring in rims and have us mount / balance the tires for you, don't tell us what vehicle you'll put these on because we'll freak out.

So, we won't be using Costco. I have neither the time nor the patience to use our "Trailer Aid" ramp to swap each rim myself, one at a time, unless it's a roadside emergency. Even then I'd try AAA first because we have their RV service option. Hopefully, when the tires become available, we can get Discount Tire to do the deed.
Just ordered a set the new Michelin Defender LTX M/S 235/75R15/XL 109T tires from Discount Tire in our area. They are finally available, so we'll have them installed on Friday if all goes according to plan. There's even a $70 rebate in effect thru Saturday based on buying 4 tires.

They will mount, balance and sell us a road hazard warranty. The only thing he asked was the GVWR for the trailer (7600). He did the math and said again he would be fine with putting them on for us.

So by this weekend we'll have our new tires and Centramatics mounted. Then I'll just reprogram the TPMS for the lower pressure (44-45 PSI is the number I've been seeing here on the forum) and we we'll be good to go.

Rocinante is our 2014 International Signature 27FB
(Named for John Steinbeck's camper from "Travels With Charley")

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Old 06-08-2016, 10:14 PM   #58
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2014 30' Classic
2015 23' International
2013 25' FB International
Apache Junction , Arizona
Join Date: Sep 2012
Posts: 4,235
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The math does work out pretty well for a 27FB.

7,600 pounds GVW - 770 pounds literature tongue weight = 6,830 pounds

6,830 pounds divided by 4 tires = 1,707 pounds per tire.

Based on the older 15" Michelins I have on the 23D derated pressure of 1,983 pounds, the tires are loaded to 86% of capacity in the example above. That percentage improves (tire load decreases and so does the tire load percentage) with the actual tongue weight being higher.

WBCCI Life Member 5123, AIR 70341, 4CU, WD9EMC

TV - 2012 Dodge 2500 4x4 Cummins HO, automatic, Centramatics, Kelderman level ride airbag suspension, bed shell

2014 31' Classic model 30 twin beds, 50 amp service, 900 watt solar system, Centramatics, Dill TPMS, disc brakes, 16" tires & wheels
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