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01-13-2009, 09:25 AM
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#21
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Guest
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Quote:
Originally Posted by jcjim4
More confusion! is there an increased safety factor in changing to a 225-75R15 rather than a 215-75R15? or other advantages?
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You can get some more load capacity, with the 225/75R15. You can find more of the 225/75R15's in a Load Range D (8ply rating) and Load Range E (10 ply rating).
Most of your 215/75R15 tires are going to be Load Range C (6 ply rated), but you may be able to find some in a Load Range D (but will probably be hard). Another thing is, a 215/75R15 size ST trailer tire is kind of an anomoly. A lot of manufacturers skip this size in their lineup. They go from a 205/75R15 directly to a 225/75R15.
This extra capacity may be overkill, but more can't hurt.
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01-13-2009, 12:06 PM
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#22
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Site Team
Join Date: Feb 2003
Location: The mountains of Scottsdale, AZ, and the beaches of Maine
Posts: 10,097
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Ragmopp et al -
Many of the questions are covered in the original thread regarding this conversion. See especially the first few posts in
http://www.trailmanorowners.com/foru...ead.php?t=6245
The new wheels are cheap and commonly available (or quickly obtained by) a tire dealer.
Regarding the spare tire holder, the thicker tire can make a difference in the spare tire holder, although apparently Scott didn't experience it. There is a discussion, and a couple different mods, described here
http://www.trailmanorowners.com/foru...ead.php?t=5828
Bill
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01-19-2009, 08:55 PM
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#23
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Member
Join Date: May 2005
Posts: 25
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More 14 inch Marathon failures
I had two 14 inch Marathon tire failures this fall -- both were original tires on our 2005 TM and were manufactured in late 2004. Our TM is garaged (no direct sunlight), I estimate 12000 miles total on the set of three (rotate each season), all three were balanced, the tires are up in the winter, and I frequently check tire pressure. I had planned to replace them this year or prior to spring 2010.
I believe that there may have been a material or manufacturing defect with this vintage of Marathon tires -- my tires should not have failed. Anyone with 14 inch Marathons of this vintage should consider replacing them.
__________________
Gary & Deb - Mid-Missouri
TM: '05 2619
TV: Chevy Traverse w/Prodigy
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01-20-2009, 02:34 AM
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#24
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Guest
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Quote:
Originally Posted by gjc-99
I had two 14 inch Marathon tire failures this fall -- both were original tires on our 2005 TM and were manufactured in late 2004. Our TM is garaged (no direct sunlight), I estimate 12000 miles total on the set of three (rotate each season), all three were balanced, the tires are up in the winter, and I frequently check tire pressure. I had planned to replace them this year or prior to spring 2010.
I believe that there may have been a material or manufacturing defect with this vintage of Marathon tires -- my tires should not have failed. Anyone with 14 inch Marathons of this vintage should consider replacing them.
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I replaced mine in July 2008, when one failed on the freeway. My tire age and usage was similar to yours. I was expecting to get another year out of them.
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01-21-2009, 02:11 PM
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#25
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Site Sponsor
Join Date: Feb 2006
Location: Pleasanton, CA
Posts: 168
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Two quick things...my TM is a year newer than those of the last two posts...right now I want to think I am wise enough to learn from your misfortunes and get new tires before the season starts...secondly, increasing tire capacity will not increase the axle capacity -- you only gain margin for blowout avoidance rather than the ability to greatly increase the over all load...right?
Mark
__________________
Mark and Corinne
SF Bay Area
11 Dodge Ram 1500 with Tow Package
or 04 Pilot w/ Tow Package
Prodigy Brake Controller; Husky 800/1200 WDH; McKesh Mirrors
2006 2720SL; A/C; awning; swing hitch; 14" NEXEN Load Range D tires
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01-21-2009, 02:43 PM
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#26
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Guest
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check the numbers
If you check the tire charts for the max load per tire on the Load Range C tires vs a load range D tire, you will find that you gain some margin of safety, Not a great deal. Unfortunately much of that margin can get eaten up by a false sense of security that causes you to load even more stuff into the TM than before.
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01-21-2009, 05:13 PM
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#27
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Guest
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Mark: You are exactly correct. The object is to increase the margin of safety, not eat it up by loading more and more stuff!
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01-21-2009, 06:13 PM
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#28
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Site Team
Join Date: Feb 2003
Location: The mountains of Scottsdale, AZ, and the beaches of Maine
Posts: 10,097
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Mark -
As you point out, increasing the tire capacity does not increase axle capacity. On the other hand, this board has heard many stories of failures on the 3500-pound tires, but never a failure on the 3500-pound axle. Dunno why.
Bill
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01-21-2009, 06:38 PM
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#29
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Guest
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Quote:
Originally Posted by Bill
Mark -
As you point out, increasing the tire capacity does not increase axle capacity. On the other hand, this board has heard many stories of failures on the 3500-pound tires, but never a failure on the 3500-pound axle. Dunno why.
Bill
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Driving at 55mph in 105 degree temperatures, I think, can impact the longevity of the tires a lot more than the longevity of the axle. Also hitting a California pothole under those conditions has little effect on the axle.
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01-21-2009, 08:53 PM
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#30
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Guest
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I suspect there is little difference between the 3500 vs 5000lb dexter axles. Like a 1/2 vs 3/4 ton truck. They can have the same axle but the suspension is dialed in to carry different amounts of weight and maintain ride. I think firmness is the issue over strength.
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