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Old 02-10-2016, 01:33 PM   #225
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You can find the answer if you Google


"Interply Shear RV tire)


or

Pro 50 will decrease likelyhood of tread separation and improve fuel economy
Con 50 may increase likelyhood of impact damage but this is not a condition I see very often of tires that are 70, 75, 80 or 85 series aspect ratio
I'm traveling to the Yukon and Alaska in a few months. I normally run the Michelin LTX M/S 2 P2345/75 R15s on my 23D at 50 psi. Given that road conditions can be less than ideal there, do you recommend a pressure lower than 50 psi?
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Old 02-10-2016, 03:23 PM   #226
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Wow - super off topic. Not a bad question, per-se, but it has zero to do with the topic of this thread.
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Old 02-10-2016, 03:59 PM   #227
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If you compare a trailer with a car, the first thing you should notice is that the trailer doesn't power itself. No torque is supplied to the tires to make the vehicle move forward - and the tire can sense that.
When you hit the brakes a tire doesn't know if its accelerating or braking.
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Old 02-10-2016, 04:43 PM   #228
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Wow - super off topic. Not a bad question, per-se, but it has zero to do with the topic of this thread.
The Michelin LTX M/S 2 P2345/75 R15s are essentially the same as the new Defender and we were talking about air pressures for typical applications.
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Old 02-11-2016, 06:45 AM   #229
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When you hit the brakes a tire doesn't know if its accelerating or braking.
Yes, it does not know the difference, because to the tire it is merely torque, but if a tire is not on a driven axle, it only feels the braking action, where a tire on a driven axle also feels all the accelerating, as well as all torque needed to keep the vehicle rolling forward.
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Old 02-11-2016, 04:41 PM   #230
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I'm traveling to the Yukon and Alaska in a few months. I normally run the Michelin LTX M/S 2 P2345/75 R15s on my 23D at 50 psi. Given that road conditions can be less than ideal there, do you recommend a pressure lower than 50 psi?

Since you are using P type tires the max load in trailer application is the max load molded on tire sidewall x .909


I would
1. Confirm with actual scale measurements that the individual tire loads do not exceed 85% of tire de-rated max load in #1 above when inflated to the 35/36 psi that I believe in on the tire sidewall where it says "Max Load xxxx KG (yyy Lbs) at 35 psi inflation

2. Get & use a TPMS with the Low Pressure warning set to 32 psi so you get early warning.

3. Read the tire "Safety Warning" molded on sidewall and run half way between the Standard load inflation 35/36 and the max pressure found in the safety warning which I thnik is 41/45 psi. This will lower the Interply Shear.

4. Keep speed down to 55 to lower chance of impact damage due to pot hols.
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Old 02-11-2016, 04:44 PM   #231
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The Michelin LTX M/S 2 P2345/75 R15s are essentially the same as the new Defender and we were talking about air pressures for typical applications.

I thought the current LTX was a P235/75R15 standard load tire and the Defender was a European design 235/75R15 109T XL.

I agree that this thread has lots of posts about a tire that is not available yet so we really do not know what it actually says on the tire sidewall.
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Old 02-11-2016, 05:28 PM   #232
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The current 15" LTX is a XL tire.
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Old 02-12-2016, 01:10 AM   #233
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Per TireRack.com:

Michelin Defender LTX M/S, 235/75R15, load range XL, service description 109T (109 = 2,271 lbs, T = 118 mph), UTQG 800 A A, maximum inflation pressure = 50 psi, made in U.S.A.
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Old 02-12-2016, 01:24 AM   #234
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Originally Posted by Tireman9 View Post
Since you are using P type tires the max load in trailer application is the max load molded on tire sidewall x .909


I would
1. Confirm with actual scale measurements that the individual tire loads do not exceed 85% of tire de-rated max load in #1 above when inflated to the 35/36 psi that I believe in on the tire sidewall where it says "Max Load xxxx KG (yyy Lbs) at 35 psi inflation

2. Get & use a TPMS with the Low Pressure warning set to 32 psi so you get early warning.

3. Read the tire "Safety Warning" molded on sidewall and run half way between the Standard load inflation 35/36 and the max pressure found in the safety warning which I thnik is 41/45 psi. This will lower the Interply Shear.

4. Keep speed down to 55 to lower chance of impact damage due to pot hols.
The current Michelin sidewall sidewall text reads....LTX M/S2 P235/75 R15 108T XL Extra Load E2....Max Load 2183 at 50 PSI.

The 23D utilizes two 3,000 pound axles. The GVWR is 6,000 pounds. My 23D's CAT scale weight fully load is typically 5250 pounds or 2625 pounds per axle. Using your derated factor of .909 and 85% safety factor, a pair of LTXs are capable of supporting 3373 per axel or 6746 pounds total. That's 1496 more than I would typically need.

I normally air them to 50psi cold at a typical ambient of 60 degrees. I'm not aware of a formula that would accurately determine the least amount of air that I could run and still safely support my load of 1687 pounds per tire on demanding roads.

The new Defender LTX M/S 235/75R15 XL 109T will support 2271 pounds per tire, 88 more than the older M/S 2. That's 68 pounds per tire more when derated and safety margin reduced. That's not a huge improvement. I assume that it would have a minimum inflation for max loading psi that is similar to the M/S2.

I've read that the tread will last 10% longer under harsh conditions and is claimed to be better in snow and ice. That's certainly a positive.
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Old 02-12-2016, 12:20 PM   #235
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The current Michelin sidewall sidewall text reads....LTX M/S2 P235/75 R15 108T XL Extra Load E2....Max Load 2183 at 50 PSI.

The 23D utilizes two 3,000 pound axles. The GVWR is 6,000 pounds. My 23D's CAT scale weight fully load is typically 5250 pounds or 2625 pounds per axle. Using your derated factor of .909 and 85% safety factor, a pair of LTXs are capable of supporting 3373 per axel or 6746 pounds total. That's 1496 more than I would typically need.

I normally air them to 50psi cold at a typical ambient of 60 degrees. I'm not aware of a formula that would accurately determine the least amount of air that I could run and still safely support my load of 1687 pounds per tire on demanding roads.

The new Defender LTX M/S 235/75R15 XL 109T will support 2271 pounds per tire, 88 more than the older M/S 2. That's 68 pounds per tire more when derated and safety margin reduced. That's not a huge improvement. I assume that it would have a minimum inflation for max loading psi that is similar to the M/S2.

I've read that the tread will last 10% longer under harsh conditions and is claimed to be better in snow and ice. That's certainly a positive.
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Looks like you have done proper research and calculations.

The new Defender does not seem to carry the USA "P" prefix but is a European design so the load capacity will be similar but not identical to the P235
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Old 02-12-2016, 03:49 PM   #236
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Wow - super off topic. Not a bad question, per-se, but it has zero to do with the topic of this thread.
Has anyone tried Firehouse subs? They're really yummy.
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Old 02-12-2016, 04:15 PM   #237
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Old 02-12-2016, 05:22 PM   #238
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Has anyone tried Firehouse subs? They're really yummy.
Yes......only in Florida though. Need their iPhone app so we can find them anywhere in North America.
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