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17.5 trailer tires


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#1 BMS-Farms

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Posted 03 August 2012 - 10:30 AM

I know that most of you are pulling heavy trailers and this would be the place to ask. I just broke down and bought 17.5 rims and tires. I am tired of sitting on the side of the road with blown out tires We were running the Goodyear 614 and have now switch to the Goodyear 114. What i would like to know is what everyone is running thier air pressure at on trailer tires. I see that alot of people are running about 85psi but i don't no the weight they are running at. Thanks for the help
Barry & Susie
Jupiter Fl,

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2008 Teton Homes Royal

#2 Mark & Dale Bruss

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Posted 03 August 2012 - 11:02 AM

We are running 115 psi

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#3 On The Road

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Posted 03 August 2012 - 11:37 AM

We are running 115 lbs also

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#4 rickeieio

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Posted 03 August 2012 - 12:11 PM

I too made the switch to 17.5's after blowing yet another GY 16" coming home from the ECR. I had 120# in them when we left for our Tetons/Yellowstone trip, and when I checked them this past weekend, the were from 117 to 119.

I was talking to some friends who are in the mechanical side of the trucking industy, and they recommend bumping my air governor to 130#, giving me the ability to air thos 17.5's from the truck. Suposedly, all the newer trucks are set at 130# from the factory.

As a side note, now that I seem to have the tire problem fixed, I find that both of my axles are toed out on the right side. Left side is perfect. Cause seems to be roadside chuck holes, curbs, dropping off the side of the pavement, etc. Trailer dealer I use said it's common, especially on rigs with undersized axles. So, I have two new axles on order. Hey, what another few hundred $......:o
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#5 'Nuf Truck

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Posted 03 August 2012 - 12:35 PM

I run Michelin commercial J-rated 17.5's, and run 120psi cold.
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#6 Jack Mayer

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Posted 03 August 2012 - 12:59 PM

I run 105 psi. Scale your trailer and set your pressure according the weight charts. The I run based on the entire trailer on the tires. 100psi gives you 4020 per tire. 105 is 4180, 110 is 4320.

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#7 BMS-Farms

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Posted 04 August 2012 - 07:37 AM

Thanks everyone for your help i think i will start out with115 psi and see how that does. I am also running the nitrogen in the trailers tires so that will help them stay cooler and will keep the psi the same all the time Barry
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Jupiter Fl,

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2008 Teton Homes Royal

#8 bstark

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Posted 04 August 2012 - 08:20 AM

I ran the same tires as you've selected on a Mobile Suites trailer with 8K axles. I can state they performed as well as could be expected after first sorting out the issues of not being able to balance two of them and ultimately replacing those two and one other for a non-heat/flex-related delamination issue. :(

After sorting out those manufacturing defect tires; their replacemnts performed well for about 5 years of travel and quite probably well over 30,000 miles of travel throughout the U.S. and Canada. I ran mine at 118 religiously with a Pressure Pro monitoring system to keep an eye on the temperature related pressure spikes when travelling throughout the heated desert areas.

A good source of knowledge on the 17.5"s as fitted to heavier trailers would be this guy I'm sure some on here have encountered in their travels.

tires and weights

His name is Stacy Franks and is/was a fulltimer with individual wheel scale sets who would weight your rig on site in-situe to give you your individual weights on each wheel for advice on trailer loading and pressures. A very knowledgable guy who will freely give advice.

Edited by bstark, 04 August 2012 - 08:22 AM.

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#9 Desolation Roe

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Posted 04 August 2012 - 10:09 AM

Thanks everyone for your help i think i will start out with115 psi and see how that does. I am also running the nitrogen in the trailers tires so that will help them stay cooler and will keep the psi the same all the time Barry


I have the same tires and run ~120 with good results.

Regarding nitrogen, the benefits are way over-stated. Its good to get rid of the water vapor, helps stop corrosion of the inner components on the tire. Same thing for getting rid of the oxygen, it helps stop oxidation of the inside of the tire.

That said, Boyle's law isn't repealed just because you are running nitrogen only. As your tires get hotter, pressures will inevitably rise. Heat transfer rates between pure nitrogen and the 79% we have in normal air are also very similar so you won't run measurably cooler.

Leakage rates are also similar with pure nitrogen and air, so probably best not to expect too much difference there either.

Geo

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#10 rickeieio

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Posted 04 August 2012 - 02:37 PM

A couple of friends have told me that the whole nitrogen myth started in racing. Race teams often use nitrogen bottles to run air tools and such because it's convenient, and takes less storage than a large capacity compressor. They can quickly air tires from large nitrogen bottles.

Of course, since "racers" use nitrogen, there must be some performance advatage, right?;)

One of these racers is from a family of roundy racers in up-state NY, the other is formerly from DEI, now free-lancing doing consulting for many NASCAR teams, and he holds 4 records for NASCAR cars and trucks at Bonneville. His opinion carries some weight.....

Besides, those green valve caps look sooo redneck.:P
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#11 DonF

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Posted 07 August 2012 - 01:59 PM

Do the math on the weight your axles carry... as Jack indicated.

I did that on ours, we carry (approx) 3500# per wheel, 8k axles, 2 axle 5'er; so I run with 105# psi (safe at 95#, so there's extra margin for air loss during cross-country journey), since these tires can run 125# psi at full inflation capacity.

ALSO, fyi, the newer HDT governors run the air up to 135#; mine cuts in at 100#, cuts out at 135#; I have the ability to use it, but my "plan A" is to carry a large PowerTank (weighs 35# full, holds 15# of CO2)... much more convenient than using the truck or some (lame) 12v compressor.

HTH!

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