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06-19-2014, 02:33 PM
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#1
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Senior Member
Join Date: Sep 2013
Posts: 84
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Tire Fun On First Long Trip
We set out from Orlando going to Branson, Mo. All was uneventful until the tread blew off one of our tires at about 300 miles into the trip (see picture). We had Goodyear Marathons ST225/75R15 inflate to exactly 65 PSI.
We bought our 2010 2619 used from Dream RV in Florida. The tires looked like new. In fact they still had the new markings on the outside of the tire. No signs of dry rot, or other noticeable issues. I had done a bearing job just before leaving on our trip. Hubs were not hot and the wheel didn't feel hot.
Made radical decision to change both tires and the spare. Found a wonderful dealer that worked a lot with travel trailers. He had the Marathons ... but said we would be better served with an E rated 10 ply steel belted radial tire. His explanation was sound I thought. So we purchased them. We ended up with Akuret ST225/75R15 HF188
Max Load 2830 LBS
80 PSI
DOT 83B4 HFA
I stopped several times traveling the rest of the way to Branson and felt the tires. They didn't feel really hot and seemed to ride well. Here is my issue. The tire guy said he would run the tires at 50 PSI. Yet the tire says 80 PSI. I checked the DELNAT web site (they make the tire) and really couldn't find an inflation range. I have read suggestions from Bill and others about inflating them slightly less than rated during the hot months. But now I am confused. Should I run them at the suggested 50 or the rated 80 PSI. I was even thinking a compromise at Trailmanor's 65 PSI. Looking for some good advice on this. Heading up to Toledo, Ohio Saturday morning and don't want any problems.
Many thanks. Daveinfl
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[SIGPIC][/SIGPIC]
Farmington, Connecticut
TrailManor 2619
2006 Ford Explorer Eddie Bauer
with tow package
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06-19-2014, 03:44 PM
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#2
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TrailManor Master
Join Date: Oct 2012
Location: North San Diego County (Fallbrook)
Posts: 632
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Dave, I've been running 60 PSI in my "D" load Maxxis and they stay cool to the touch. 65 Psi sounds right for the "E" load range. At 80 PSI you would vibrate every screw loose in your trailer, but at 50 PSI the tires might get pretty warm.
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Tim
"A man creates his own legacy. Create a legendary life"
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06-19-2014, 05:07 PM
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#3
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Site Sponsor
Join Date: Jul 2006
Location: Sunny Beaches of Los Angeles
Posts: 3,274
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I run 65 psi in my load range E tires. When I first bought them 3-4 years ago, I ran them at 80 psi, and as Tim suggested above, it rattled alot of stuff loose. So after a few trips of that, I deflated to 65 and haven't had any problems since.
Dave
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2000 2720SL & 2007 3124KB
2005 Toyota Sequoia
Twin Battle Born 12v 100Ah LiFePO4 (BBGC2) batteries, 300W solar on rear shell, Link 10, Lift kit, Maxxis 8008 225 75/R15 E tires
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06-19-2014, 05:35 PM
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#4
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TrailManor Master
Join Date: Oct 2011
Location: EAST TENNESSEE
Posts: 699
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ditto here, run at 65 psi ,
into our 2ed season on them, no trouble so far
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[SIGPIC][/SIGPIC]
RANDY & VICKIE
2003 3124 KS
TV 02 AVALANCHE 2500 4X4 8.1L
W/ PRODIGY B.C.,MAXXIS 10 PLY,HONDA 3000I
TM HISTORY
(88) TM 25 KING, (91) TM 23,(98) 3023, (03) 3124KS
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06-20-2014, 07:59 AM
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#5
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TrailManor Master
Join Date: Oct 2010
Location: Big Bend area, Florida
Posts: 2,120
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Started ours at 80 psi per maker and wmtire. No problems there; into our 2nd season on them and have settled at 70 psi based on over inflation indications. Again no problems.
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Axis 24.1 E 450 chassis, 6 spd tranny. GVWR 14500# GVCWR 22000 # GW(scales) 12400 #
[SIGPIC][/SIGPIC]
mods: 2- 100 watt solar panels, on roof, 300 watts portable
“They who would give up essential Liberty, to purchase a little temporary Safety, deserve neither Liberty nor Safety.” Benjamin Franklin
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06-20-2014, 09:41 AM
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#6
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TrailManor Master
Join Date: Apr 2014
Location: Orlando
Posts: 2,796
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OK you do not have to use the maximum inflation. What you do need to us is an inflation appropriate to the use. In the upper ranges the inflation vs load is pretty linear so if you figure a 2720SL is about 4k running down the road and the tongue weight is 450 than the residual is 3550 adding a 15% shock factor and you are back to 4080 or 2040 per tire. If the tire is rated at 2830@ 80 psi then the theory says 57 psi so 60 is fine.
OTOH my 205x75R15 LRD are rated at 2150@65 psi so using the same method you get 61 psi or about 4 psi more than the 225s mainly from the lesser chamber volume.
All you really need to know without getting into complex math, standing wave effects, & tire engineering is that load is related to volume and psi. The tire size (205/75) relates to volume. The main thing is that higher "Load Ranges" for a given size add is more psi. Also radials have less drag (run cooler) than bias ply.
I use a similar method when racing in stock classes but figure the entire vehicle load is on the outside wheels in a hard corner (1+ gee) which produced some astounding pressures. All I can say is that when first using this method I began hitting inside pylons.
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Looking for a 24/17 in or near Florida.
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