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Old 05-07-2013, 10:49 AM   #1
rickst29
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Question What about smaller diameter on 15" wheels?

As Bill just pointed out [http://www.trailmanorowners.com/foru...38&postcount=6], I'm probably thinking too much - I've also had a great experience with Marathon ST225/75R15 Load Range D (though I run them at reduced pressure, to make up for my less flexible 5000 lb Torflex). But here is a new idea: We have many reports of Tread separation, and I wonder if some of those might be caused by road hazard (pothole or rock) pushing the tire against the TM wheel well. Maybe these tread separation disasters are more a result of "tread scraped off against the wheel well", and less of "failure internal to the tire"?

Even with lift kit and bigger Torflex, my 2619 provides for only small excursions in the wheel well. (The worst dimension under the worst conditions is barely one inch.) Diameter of the tire is about 28.3".

Maybe a switch into a smaller tire, on the same 15" wheel, (ST205/75R15 on 6.0") would be as effective (or even more effective) for blowout reduction as use of heavier-duty ST225/75R15 LR-D and LR-E tires?

Looking at the new Carlisle "HT" product line specs here, http://www.carlisletransportationpro...wables/Tires43, we would be staying on 6.0" rims. The diameter would be reduced from about 28.3" to about 27.2", and we also loose some mounted width: 9.0" down to 8.2". That's roughly 1/2" more room for the tire to move, relative to TM, before hitting a wheel well surface.

But the maximum load per tire would be significantly less, dropping from 2500+ lbs to about 2150. (These "smaller" tires running at 65 PSI can only carry the weight of the "normal" ST225/75 tires running at about 50m PSI - performance like load range "C" in the bigger tires.) The original 14" tires, with so many problems, were rated at either 1760 lbs or 1870 lbs.

So I'd loose a bit less than 2/3 of my current load capacity improvement, in order to gain about 1/2" of space in the wheel well. What do you all think?

(This Carlisle "HT" seems to be the only ST205/75R15 tire with Load range "D" on 6.0 inch rims - the other ST205/75-LRD tires want to mount on only 5.5".)
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TM='06 2619 w/5K axle, 15" Maxxis "E" tires. Plumbing protector. 630 watts solar. 450AH LiFePO4 batteries, 3500 watt inverter. CR-1110 E-F/S fridge (compressor).
TV = 2007 4runner sport, with a 36 volt "power boost".
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Old 05-07-2013, 11:26 AM   #2
ShrimpBurrito
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I would not do what you are suggesting. I have had 3 blowouts, and if they were a result of scraping against the wheel well, the wheel well would show it -- there would actually be alot of damage there. The wheel well is a flimsy piece of sheet metal (or plastic in later model TMs), and it is no match for a steel-belted thick rubber tire spinning several hundred times per minute. So it should be easy to tell on your TM if that is a problem. How do the wheel wells look? If they are not torn apart, I seriously doubt there is any contact. Dimples and dents from pebbles, dirt, and other road debris, sure.

My TM has comparable clearance -- about 1.25" at its smallest gap.
http://www.trailmanorowners.com/foru...ead.php?t=6078

Furthermore, the gap on one side of the tire actually gets larger when you hit a bump due to the torsion arm of the axle.

Dave
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Old 05-07-2013, 11:37 AM   #3
rickst29
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thanks, Dave! your blowout experience is great value in guiding my guesses.

So, I'm going to buy ST225/75-R15-LR-E, and run them at the highest pressure which doesn't cause trailer contents to bounce. (Probably down in the 55-65 PSI range).
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TM='06 2619 w/5K axle, 15" Maxxis "E" tires. Plumbing protector. 630 watts solar. 450AH LiFePO4 batteries, 3500 watt inverter. CR-1110 E-F/S fridge (compressor).
TV = 2007 4runner sport, with a 36 volt "power boost".
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Old 05-07-2013, 12:09 PM   #4
Harry Womack
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Default Tires

All the problems go away when you quit using the Good Year Tires. I have 4 trailers with Maxxis tires and have not had any problems. The count for Good Year was 8 tires blew out
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Old 05-07-2013, 04:16 PM   #5
rickst29
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Harry, did you install your Maxxis tires on a wider wheel? At summitracing.com (which is local for me), Maxxis 225/75 tires have a suggested wheel width of 7.0 minimum, 80.0 maximum.
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TM='06 2619 w/5K axle, 15" Maxxis "E" tires. Plumbing protector. 630 watts solar. 450AH LiFePO4 batteries, 3500 watt inverter. CR-1110 E-F/S fridge (compressor).
TV = 2007 4runner sport, with a 36 volt "power boost".
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Old 05-08-2013, 06:16 AM   #6
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Quote:
Originally Posted by ShrimpBurrito View Post
I would not do what you are suggesting. I have had 3 blowouts, and if they were a result of scraping against the wheel well, the wheel well would show it -- there would actually be alot of damage there. The wheel well is a flimsy piece of sheet metal (or plastic in later model TMs), and it is no match for a steel-belted thick rubber tire spinning several hundred times per minute. So it should be easy to tell on your TM if that is a problem. How do the wheel wells look? If they are not torn apart, I seriously doubt there is any contact. Dimples and dents from pebbles, dirt, and other road debris, sure.
...
Agreed. Our previous popup had a severely under-rated leaf springs (or we were severely over-loading the trailer ), and when they broke, the trailer floor dropped onto the tire. The tire's tread never separated, just wore down as it ate into the trailer floor.
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Old 05-08-2013, 03:29 PM   #7
Harry Womack
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Default Rim size

The rim is 6" wide. That is the standard rim used on all ST225 tires on Southwestwheel.com web site.
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2005 3124KB, 200 watt solar
1750 watt 120 volt inverter
Maxxis load range E tires @ 75 PSI
2013 1500 Suburban Z71 5.3 4X4 w/
Firestone air bags inside of springs.
Not using Trail Manor now. Replaced
with 2020 motorhome
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