Goodyear marathons air pressure question

[gofishloop]

I had 2 new marathons mounted yesterday on my rims while off the trailer. I had Big 10 add 60 cold PSI off the trailer. I elected to do the extra 10 PSI after reading on the Goodyear wed site that if you plan to go over 65 MPH to add 10 cold psi. So my question is........Should I re air the tires on the trailer under the load as opposed to filling off the trailer?

After the 2nd blowout in 5 years, I want to get it right....and truthfully I have not always managed the air very well. Time for a change.

[21XDC]

Never heard of filling more than the tire specs before... Can you please post a link to this advice?

[looking4five]

If they put the correct amout that you wanted when mounted, you shouldn't have to do anything when you put them on the ground.

I have never heard about adding 10psi before.....I have always just ran mine at 50psi, and never had any trouble. I'm going to have to check into that. I ran over something, and ruined a tire (piece of metal on the road went into the sidewall of tire) the last time I took the boat out. I had the same exact thing happen about 1-1/2 yrs ago, and was able to patch that one & it's been my spare since then.

I ordered (2) new tires, and they should be waiting for me when I get home. Them tires are pretty pricey aren't they!

[gofishloop]

http://goodyear.com/rv/pdf/mar...6.pdf


See this link from goodyear

[looking4five]

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by gofishloop &raquo;</TD></TR><TR><TD CLASS="quote">http://goodyear.com/rv/pdf/mar...6.pdf


See this link from goodyear</TD></TR></TABLE>

That's very good to know. I would think the extra pressure would promote lower tire temperatures, and less rolling resistance (better fuel mileage for the tow vehicle). Thanks for the link!

[21XDC]

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by gofishloop &raquo;</TD></TR><TR><TD CLASS="quote">http://goodyear.com/rv/pdf/mar...6.pdf


See this link from goodyear</TD></TR></TABLE>

Thanks... Now how do I find out if my rims/wheels will take the extra 10 lbs?

[EL Skeeter]

Look on the side of the tire, for Max air pressure if it's 50 PSI max Then your tires WILL NOT take the extra 10 psi safely,thus you re restricted to 65MPH.

[srode]

I never heard of blow out problems with Marathons when they were made in the US - they are now made in China.

[tcesni]

The link says you can exceed the max on the tire by 10 psi IF your wheel can take it.

[21XDC]

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by EL Skeeter &raquo;</TD></TR><TR><TD CLASS="quote">Look on the side of the tire, for Max air pressure if it's 50 PSI max Then your tires WILL NOT take the extra 10 psi safely,thus you re restricted to 65MPH.</TD></TR></TABLE>

You better read it again, but slower..

[MisterE]

· Industry standards dictate that tires with the ST designation are speed restricted to 65 MPH under normal
inflation and load conditions unless a different speed restriction is indicated on the sidewall of the tire.
· Based on industry standards, if tires with the ST designation are used at speeds between 66 and 75 mph, it is
necessary to increase the cold inflation pressures by 10 psi above the recommended pressure for the load.
o Do not exceed the maximum pressure for the wheel.
o If the maximum pressure for the wheel prohibits the increase of air pressure, then the
maximum speed must be restricted to 65 mph.

That's how I interpretted it also.

[Chris M]

So how can you tell if your wheel is rated for the extra PSI? I have th aluminum ranger wheels. Also, where is the best place to get marathins? I looked at Wally world $110 a piece, Tirerack.com $83 a piece (cheapest so far) Any where else I can look?

[looking4five]

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Chris M &raquo;</TD></TR><TR><TD CLASS="quote">where is the best place to get marathins? I looked at Wally world $110 a piece, Tirerack.com $83 a piece (cheapest so far) Any where else I can look?</TD></TR></TABLE>

I ordered (2) of the Marathon ST205/75R14 with raised outlined white letters (ROWL) shipped to my house for $171.54 from Tread Depot last week. 888 421-8473. This is the second time that I have ordered some tires from that place, and they have shipped very fast both times.

P.S....the tires that I received had "made in the USA" on them NOT china. I had heard people saying that Goodyear had moved manufacturing to china???? Just thought that I would let you know that.

[Chris M]

Thanks. I'll be giving them a call. RWL is what I was really wanting anyway to match the others. BTW...the one I saw in Wal Marts display also said "Made in U.S.A"

[Tx Champ]

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by MisterE &raquo;</TD></TR><TR><TD CLASS="quote">· Industry standards dictate that tires with the ST designation are speed restricted to 65 MPH under normal
inflation and load conditions unless a different speed restriction is indicated on the sidewall of the tire.
· Based on industry standards, if tires with the ST designation are used at speeds between 66 and 75 mph, it is
necessary to increase the cold inflation pressures by 10 psi above the recommended pressure for the load.
o Do not exceed the maximum pressure for the wheel.
o If the maximum pressure for the wheel prohibits the increase of air pressure, then the
maximum speed must be restricted to 65 mph.

That's how I interpretted it also.</TD></TR></TABLE>


Here's the rest of the story. A tandem axle trailer with 4 ST205/75R14 inflated to 50# ea will carry a load over 7000 lbs. I haven't seen a bass rig yet that would come close to that, so I see no need in exceeding 50# a tire. And I would never exceed the max pressure on the sidewall.

However, I strongly feel that most of the blow-out & tread slinging stories come from guys that get in and go and never check their tire pressure. running highway speeds on an under inflated tire builds heat and that is what causes tires to come apart. I've been pulling boats, motorcycles, and pop-up campers for almost 40 years and have yet to have a trailer tire failure. But I religiously check the pressure before every trip, especially on the 10 & 12" wheels that usually call for 65# or so. Remember the smaller trailer tires are turning a lot faster than your tow vehicle tires.

[Mykey]

I've read of accounts whereby some guys travel at seventy to eighty miles an hour with their boat trailers in tow. Unless the laws are different in other states, the signs all over our roadways states fifty five miles an hour. Frankly, I don't feel it's safe (even with the tandem trailer) over sixty heading down hill. The investment is so high and some boats (like my Ranger) are heavy. I don't understand the need for speed on the road or the water, I want to be around to enjoy the ride on and off the water.

[Tx Champ]

Most highways in TX are 70 mph. Some rural highways have 75 mph posted and portions of I-10 & I-20 are posted at 80 mph. In NM, I-40 is 75 mph, don't know about I-10 through NM. I have no problem pulling my boat safely at 70.

[CatFan]

I've pulled mine for hundreds of miles at nearly 80. A bass boat isn't a heavy load at all. Barely know it's back there compared to a flatbed with a bobcat or tractor back there.