Trailer tire pressure?

[yelbike]

Crap I just put on six new carlisle tires between my small cargo trailer and my car hauler in the past month. I did notice just today that the tires on my cargo trailer are rated less then the axle rating, I'll have to make sure the loads stay on the lighter side. Oooops!!!

 

[Soundguy]

i'm not a fan of carlisle....

 

[bucktaker]

For my 6600 lb boat and trailer It had 14 inch wheels and tires went with Kumho 857 commercial 14 in tire from tire rack 3 yrs ago now no issues @ 63 psi. Really like them and and hoping to find them in a 15 d rated as I need new tires for my Mortiz stock/combo horse trailer. if not I will go with a D rated LT tire

 

[topbuilder]

"As you noted you started with Carlisle's. They are junk and should be outlawed in my opinion."

I agree. I had a set of four on a 20" gooseneck . All four separated at the same time. Low miles. Sad thing is my dealer had 2 options for "E" trailer tires. Carlisle or Chi-Com brand X. Two purchases I will never settle for Chi-com products... food and tires. Getting pretty hard to draw a line in the sand for many other products.

 

[Bird]

Crap I just put on six new carlisle tires between my small cargo trailer and my car hauler in the past month. I did notice just today that the tires on my cargo trailer are rated less then the axle rating, I'll have to make sure the loads stay on the lighter side. Oooops!!!

All these comments about Carlisle make me wonder. About a year and a half ago, I bought a cheap 5' x 8' Carry-on trailer from Lowe's, primarily (almost exclusively, in fact) to haul my little Toro ZTR. This is the first experience I've had with Carlisle tires, but that's what came on it. The little trailer supposedly weighed about 350 lbs. and has a GVWR of 2,000 lbs.; however, it has the two 4.80 x 12 Carlisle tires rated for 990 lbs. at 90 psi. So I guess you could say it's a 1,980 GVWR.

But I wonder how many people with such tires never look at the information on the sidewall. In my case, I would never have expected these little tires to run pressure that high. In fact, when I saw that on the sidewall, I looked them up on the Internet to confirm it wasn't a mistake by my old eyes.:laughing:

Now I'm sure some, such as DiamondPilot, know and check such things, but I'd also suspect that a lot of people figure 35 psi ought to be good, so they're running underinflated.

And of course, those who have had troubles and reason to complain about Carlisle probably had entirely different sized and type of tires from my little trailer, too.

 

[Soundguy]

my 16' flatbed I bought years back had that problem. tires supplied with it wouldn't get near the 7k rating..

All these comments about Carlisle make me wonder. About a year and a half ago, I bought a cheap 5' x 8' Carry-on trailer from Lowe's, primarily (almost exclusively, in fact) to haul my little Toro ZTR. This is the first experience I've had with Carlisle tires, but that's what came on it. The little trailer supposedly weighed about 350 lbs. and has a GVWR of 2,000 lbs.; however, it has the two 4.80 x 12 Carlisle tires rated for 990 lbs. at 90 psi. So I guess you could say it's a 1,980 GVWR.

But I wonder how many people with such tires never look at the information on the sidewall. In my case, I would never have expected these little tires to run pressure that high. In fact, when I saw that on the sidewall, I looked them up on the Internet to confirm it wasn't a mistake by my old eyes.:laughing:

Now I'm sure some, such as DiamondPilot, know and check such things, but I'd also suspect that a lot of people figure 35 psi ought to be good, so they're running underinflated.

And of course, those who have had troubles and reason to complain about Carlisle probably had entirely different sized and type of tires from my little trailer, too.

 

[Diamondpilot]

Bird, to answer your question kind of. My last trailer I bought with Carlisles I bought brand new had 3 6,000# axles running 10 ply at 80 psi I lost 4 in the first 800 miles.

This is on a 18,000# trailer running at 15,600#, well below the gvwr.

It was not my first run in with them. I also had issues on a 12,000# trailer running at 8,600# and a 7,000# trailer running at 6,800#. None of these Carlisle tires made it more than 3,000 miles and all were replaced with Greenball TowMasters for thousands of miles with never a single issue after.

Proof enough for me. By the way this is over a period from 1999 to 2007, so the sample size is large.

My luck with Goodyear Marathons is no better. My other 7,000# trailer came with P rated passenger tires an no issues. After 6 years of service they were worn out so i put on the Marathons. In 6 months I had 2 fail. Replaced with Greenballs and all is fine. Same thing with my 12,000# boat trailer. Came with them and after 4 years 2 of them also failed so it now has Maxxis on it and no issues in2 years and well over 10,000 miles.

I will take these imported tires any day of the week over the Carlisles and Goodyears.

Chris

 

[CompactTractorFan]

I've only had 2 in my life; a right rear on a '56 Merc doing over 100 mph in '58 and a left front on a '66 Chevy doing over 100 mph in '66.

What is the story behind these?

 

[Bird]

What is the story behind these?

Kyle, the Merc was when I was a dumb teenager on a long straight stretch of road with no other traffic in sight and I decided to see how fast that car could go. The Chevy was a squad car and I was in pursuit of a speeder who said he was running late getting to work. He heard the siren, saw my lights, and started stopping just as my left front tire let go.:laughing: In those days, neither of those cars had disk brakes or power steering, but I had no problem stopping in a straight line. Of course I knew not to hit the brakes too hard or suddenly.

 

[CompactTractorFan]

Kyle, the Merc was when I was a dumb teenager on a long straight stretch of road with no other traffic in sight and I decided to see how fast that car could go. The Chevy was a squad car and I was in pursuit of a speeder who said he was running late getting to work. He heard the siren, saw my lights, and started stopping just as my left front tire let go.:laughing: In those days, neither of those cars had disk brakes or power steering, but I had no problem stopping in a straight line. Of course I knew not to hit the brakes too hard or suddenly.

I figured one of them was when you were a police officer, but I wasn't sure about the other.

 

[3930dave]

From the Tire Rack site:

"Special Trailer (ST) Tire Speed Ratings

Industry standards dictate tires with the ST designation are speed rated to 65 MPH (104 km/h) under normal inflation and load conditions.

However industry standards also stipulate, if tires with the ST designation are used at speeds between 66 and 75 mph (106 and 121 km/h), it is necessary to increase their cold inflation pressure by 10 psi (69 kPa) above the recommended pressure for the rated maximum load.

Do not exceed the wheel's maximum rated pressure. If the maximum pressure for the wheel prohibits the increase of air pressure, then maximum speed must be restricted to 65 mph (104 km/h).

The cold inflation pressure must not exceed 10 psi (69 kPa) beyond the inflation specified for the maximum load of the tire.

Increasing the inflation pressure by 10 psi (69 kPa) does not provide any additional load carrying capacity."

Tire Tech Information - Trailer Tires vs. Passenger Vehicle Tires

Personally, I'm going to be doing a LOT of further research before I starting adding the pressures described above to my ST tires. If you decide to over-pressure your own ST tires, you do so at your own risk.

Just wanted to post this TRack info, as food for thought.

Rgds, D.

 

[Diamondpilot]

I have always ran max tire pressure on my ST tires and had good luck with quality tires like Geenball and Maxxis. Run any lower or sub par tires and they are like a time bomb.

Chris