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Old 09-05-2016, 04:31 PM   #29
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I purchased a Michelin LTX M/S2 P235/75R15 Defender in June. Both E2 and Extra Load are stamped on the sidewall.

MAX LOAD 2183 LBS and MAX Press 50 PSI also appear on the sidewall.

I'd like to know the source of franklyfrank's Load Range chart. It certainly does not square with Michelin's description of their tire, P metric, E2, Extra Load, 108T to be run at 50 psi max.

I'd also like to know where Bill M's info "I think the deal is they are rated to carry the full load capacity at any pressure from 42 to 50 with a 50 psi maximum" originates.

I'm especially interested in this thread because I'm looking to replacing the Goodyear GYMs that came on my 25FB. I'drather not go to LT 16s.
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Old 09-05-2016, 05:27 PM   #30
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My source was memory from reading these forums for a while. But here is an explanation of load rating and a chart showing max load at 41 psi from Tire Rack with an explanation that it is actually 42 psi.
Actually it does "square" with Franks chart. The other pertinent information is that for use of a P tire on a trailer DOT requires that the maximum load rating is 10% less that what is stamped on the tire. That gives you 1965 lbs for trailer use. (This is one of the statements that aggravates Frank)

And note that it says max load 2183 and max pressure 50 psi. But it does not say 2183 at 50 psi. I think that statement is actually true, but it also carries 2183 at any pressure down to 42 psi. Like I said, I run mine at 48-50 because I only found the lower pressure numbers recently and saw no reason to change what works good.

I think the E2 means the tire was registered in France.

I do not know about the Defender yet. I have been running the LTX 15" tires for 8 years now. The first set was a true LT tire (load range C). The second the p-XL tires. I hope the Defenders are as good. 8 trouble free years of smooth pulling and a good ride for the trailer. I will get new tires next spring and probably the Defenders.


From the Tire Rack site:

"The load range/ply rating branded on a tire's sidewall identifies how much load the tire is designed to carry at its industry specified pressure. Passenger tires feature named load ranges while light truck tires use load ranges that ascend in alphabetical order (letters further along in the alphabet identify stronger tires that can withstand higher inflation pressures and carry heavier loads). Before load ranges were adopted, ply ratings and/or the actual number of casing plies were used to identify the relative strength with higher numeric ratings or plies identifying tires featuring stronger, heavier duty constructions.

Today's load range/ply ratings do not count the actual number of body ply layers used to make up the tire's internal structure, but indicate an equivalent strength compared to early bias ply tires. Most radial passenger tires have one or two body plies, and light truck tires, even those with heavy-duty ratings (10-, 12- or 14-ply rated), actually have only two or three fabric plies, or one steel body ply.

In all cases, when changing tire sizes or converting from one type of size to another, it is important to confirm that the Load Index in the tire's service description of the new tire is equal to or greater than the Load Index of the original tire and/or that the new tire's rated load capacity is sufficient to carry the vehicle's gross axle weight ratings.

"The load range/ply rating branded on a tire's sidewall identifies how much load the tire is designed to carry at its industry specified pressure."

Passenger Tires
Since most P-metric passenger tires are manufactured in the standard load range, they will have nothing branded on their sidewalls or may be branded standard load and identified by an SL in their descriptions, as in P235/75R-15 SL.

Extra load P-metric tires will be branded extra load, and identified by an XL in their descriptions, as in P235/75R-15 XL.

Light load P-metric tires will be branded light load, and identified by an LL in their descriptions, as in P285/35R-19 LL.



P-Metric Passenger Vehicle Tires
Load Ranges Abbreviated Maximum Load Pressure
Light Load LL 35 psi (240 kPa)*
Standard Load Nothing or SL 35 psi (240 kPa)*
Extra Load XL 41 psi (280 kPa)*
*In an effort to internationally harmonize load ratings and ranges, recently introduced and future LL, SL and XL P-metric sizes will use ISO/Euro-metric maximum load pressures of 36 or 42 psi
Standard Euro-metric tires will have nothing branded on their sidewalls, while extra load/reinforced Euro-metric tires will be branded as such and identified by an XL or RF in their descriptions, as in 305/50R20 XL or 305/50R20 RF.

Euro-Mc Passenger Vehicle Tires
Load Ranges Abbreviated Maximum Load Pressure
Standard Load Nothing or SL 36 psi (250 kPa)
Reinforced or Extra Load** RF or XL 42 psi (290 kPa)
**Reinforced and extra load nomenclature may be used interchangeably to designate heavy-duty tires
Light Truck Tires
Since light truck tires are often available in multiple load ranges, the appropriate load range is identified immediately following the size's rim diameter in Tire Rack's descriptions.

LT-metric, LT-flotation and LT-numeric tires are branded with their load range (load range E or LRE) or their ply rating (10 ply rated) on their sidewalls and list their appropriate load range letter in their descriptions as LT245/75R-16 E, 7.50R-15 D or 31x10.50R-15 C. LT-sized tires featuring section widths of 305mm/12.50" or wider have their maximum loads and cold tire pressures rated at reduced maximum load pressures.

LT-Metric, LT-Flotation and LT-Numeric Light Truck Tires
Load Range Ply Rating Abbreviated Maximum Load Pressure
B 4 B 35 psi (240 kPa)***
C 6 C 50 psi (350 kPa)***
D 8 D 65 psi (450 kPa)***
E 10 E 80 psi (550 kPa)***
F 12 F 95 psi (650 kPa)***
***Selected large LT sizes are designed with reduced maximum load pressures
Euro-Metric Commercial Vehicle/Van Tires
Load Index Maximum Load Pounds Maximum Load Pressure
116/114 2,705/2,600 69 psi (475 kPa)
118/116 2,910/2,755 75 psi (525 kPa)
121/120 3,195/3,085 83 psi (575 kPa)
Euro-metric commercial vehicle/van tire dimensions end in a C (signifying commercial), such as 225/75R16C. Differences in load capacities and maximum pressure are identified by their load index and the maximum load/pressure for single/dual applications branded on their sidewall. The example provided above is for single/dual applications of a 225/75R16C size tire.

Special Trailer Service Tires
Special trailer service tires are often available in multiple load ranges. The appropriate load range is identified immediately following the size's rim diameter in Tire Rack's descriptions.

ST-metric sized special trailer service tires will be branded with their load range (load range D or LRD) on their sidewalls and list their appropriate load range letter in their descriptions as ST205/75R15 LRD.

ST-Metric Trailer Service Tires
Load Range Ply Rating Markings Maximum Load Pressure
B 4 B 35 psi (240 kPa)
C 6 C 50 psi (350 kPa)
D 8 D 65 psi (450 kPa)
E 10 E 80 psi (550 kPa)
Related Links

Diameter Comparison of Light Truck
Tire Sizes
Dual Tires for Light Truck Use
Light Truck Fitment Formula
Load Reduction of Euro- &
P-Metric Tires on Light Trucks "
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Old 09-05-2016, 05:37 PM   #31
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15" Michelin tires recommended?

Quote:
Originally Posted by interstateflyer View Post
I purchased a Michelin LTX M/S2 P235/75R15 Defender in June. Both E2 and Extra Load are stamped on the sidewall.



MAX LOAD 2183 LBS and MAX Press 50 PSI also appear on the sidewall.



I'd like to know the source of franklyfrank's Load Range chart. It certainly does not square with Michelin's description of their tire, P metric, E2, Extra Load, 108T to be run at 50 psi max.


Interesting. I thought on P rated tires there is an "XL" (extra load) designation which applies here but I haven't seen the Defenders (which replace the LTX/MS2?) and an E2 stamp which I understood to apply to LT destinations. I also don't know how Frank is interpreting that chart and applying it to these specific tires.

I'm not convinced these tires become E load range tires by exceeding their sidewall PSI - I'd be glad to be wrong on that but I haven't seen any evidence of that here.
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Old 09-05-2016, 07:49 PM   #32
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In May of this year I replaced my Maxxis E load range tires that were 5 years old. The tire said 80 lbs. maximum inflation I ran 70 because the trailer bounced more than I liked. They would build heat more than I liked also. Wanted a softer tire/ride but never went below 70 lbs.
I put on Michelin P235/75R15 LTX MS 2 Extra Load tires. Tire says 50 lbs. maximum inflation and that is what I run them at. Now when I cross a rxr track or other bumps the trailer just seems to float across. They don't build heat at all. I believe they have a load capacity of 1985 lbs. after I derate them.
I have 2006 30 ft Classic with a slide. With both tanks empty my trailer weighs in at 7480 lbs. So i am right on the top end of the weight carrying capacity.
I love the tires, never lost any air and they really soften the ride for the trailer.
We have been on 3 short trips since installing them. 1150 miles, 1151 miles, and 2468 miles.

I run Centramatics on the trailer. I also run them on my 2011 Ram 2500 since new. I got 78,000 miles out my original Michelins. Most of those miles towing. Tires still looked good and smooth, just thought it was time to replace them. Love the Centramatics, no cupping of tire treads and flat
all the way across.
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Old 09-05-2016, 07:58 PM   #33
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Quote:
Originally Posted by Bill M. View Post

I think the E2 means the tire was registered in France.
Yes Bill. This should clear up the E2 confusion.

http://www.tirerack.com/tires/tirete....jsp?techid=15
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Old 09-05-2016, 09:40 PM   #34
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Very helpful. Thanks!
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Old 09-05-2016, 10:17 PM   #35
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Didn't CanAm Andy recommend 44 psi for the Michelin 15" tires being discussed in this thread? As I recall, his point was that 44 psi gave the tires all the load carrying ability inherent in that tire, yet offered a very smooth ride for the trailer.
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Old 09-05-2016, 10:22 PM   #36
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Originally Posted by Bob662 View Post
Didn't CanAm Andy recommend 44 psi for the Michelin 15" tires being discussed in this thread? As I recall, his point was that 44 psi gave the tires all the load carrying ability inherent in that tire, yet offered a very smooth ride for the trailer.
I emailed Andy about this. He recommended running the Defender LTX at 50psi.
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Old 09-06-2016, 02:43 PM   #37
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If this helps, there was a post by Tireman9 (http://www.airforums.com/forums/f438...ml#post1733592) that contained comments from a Michelin contact.\ on the LTX tires.
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Old 09-06-2016, 03:23 PM   #38
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Quote:
Originally Posted by NoResults View Post
I have the Michelin 235/75 R15 LTX and am confused as to what pressure to run. Tire says max 50PSI, however what pressure should you have them at. Is 40 or 45 to low?

Can't seem to find a good answer.

Dave
The load capacity of tires will vary with inflation pressure. The new 23s are 6000 lb gross or 1500 lbs per tire. If you add some safety factor to account for individual tire loading, you could assume the tires might have an 1800 lb load.

Could not find a chart specifically for the LTX XL tire, but it looks like 40-44 psi is about right for the loading on a 23. The test is to set the inflation cold and check it at run temp. If you get more than a 10% increase, the pressure is too low. This is covered in several threads. Read up a bit if you have time.

Travel safe. Pat
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Old 09-06-2016, 03:29 PM   #39
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I just noted today if your running ST tire that some of the makers are now saying to inflate them to max pressure that is on side wall, that changes with load range.
The last set I had put on the dealer would not put them at 55 PSI that was on trailer data plate. He put 80 PSI that was max PSI on side wall.
So now I run at 80 PSI cant tell ride has changed BUT I never had a ride in the trailer.
We will see if they fail like all the others ST tires I have run.
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Old 09-08-2016, 04:24 PM   #40
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"We will see if they fail like all the others ST tires I have run."

So why are you still running ST tires?
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Old 09-09-2016, 04:58 PM   #41
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Originally Posted by Ecodog View Post
Just got info from a Michelin rep about the Defender LTX series. While the 235/75R15/ is rated at 2271lbs @5O psi, it has an XL rating and NOT an LT rating. The XL rating (Extra Load) is one grade up from a standard P rated passenger tire, and as such should be derated for use where heaver loads are anticipated. The Defender series does offer LT rated tires, but they start at the 16" rim size and above.

Here is the link that the Michelin rep sent me to for current specs on this line.

http://www.michelinman.com/US/en/tir...s/details.html

Let the debate continue...
If the XL rating means " Extra Load", why would it need to be "derated"?
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Old 09-10-2016, 08:27 AM   #42
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Originally Posted by MelGoddard View Post
If the XL rating means " Extra Load", why would it need to be "derated"?
Because the load carrying capacity of all P type tires used in a light truck or trailer application need to be derated by a factor of 1.1 regardless if they are Standard Load or Extra Load. That derating requirement is not only part of the published tire standards, but it is also part of the government regulations.
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