Trailer tire pressure

makeall6makeall6 Posts: 51 Baller
I have a 2004 S/N on a Ramlin tandem trailer and just had a massive blowout on one of the front tires. Kapow! Even damaged the fender. New tire today and I noticed the guy at the tire store only inflated the tire to 20PSI. The label on the trailer says max of 35PSI. What is the best pressure to inflate? Thanks.
Tom Whaley


  • RednucleusRednucleus Posts: 842 Mega Baller
    Two things: My buddies say trailer tires usually run closer to 50 lbs - were you sold a trailer tire or a car tire? 2nd - running low pressures create more heat than running proper pressures.
    BTW how old are your other tires??
  • jjackkrashjjackkrash Posts: 1,179 Mega Baller
    The load and speed rating for a trailer tire are based on the max psi rating on the tire. I would always run right on max which should be measured cold.

    Heat and age kill trailer tires. 4-5 years max.

    Heat is generated by speed and asphalt/road temp. Check the speed rating for your tire. It is really a heat rating. If it is 105 out and you are going at, near or over max speed, that's a recipe for a hot tire and a blow out.
  • ScottScottScottScott Posts: 1,384 Mega Baller
    Not sure how many situations 20 would be correct. Even car tires have max psi higher than 35, tho 30-35 is often recomended by manufacturer. Trailer tires are usually max psi 60-80 (ours are 80.) With trailers inflate to max psi.
  • skiboynyskiboyny Posts: 304 Baller
    I think the pressure goes up with the sidewall ply. I would look for a 8 ply and keep them full. 35lbs has got to be a flimsy tire.
  • jjackkrashjjackkrash Posts: 1,179 Mega Baller
    PSI is driven by load range. That sounds like a Load Range B tire, which is about the flimsiest rating. Look for some Load Range C or better yet D tires with at least a 75MPH speed rating.
  • makeall6makeall6 Posts: 51 Baller
    Thanks to all. Great info as always. Cheers.
    Tom Whaley
  • JmoskiJmoski Posts: 481 Crazy Baller
    The trailer should have a placard on it with the exact tire spec listed.

    Goodyear endurance trailer tires are great if they have them in your size - speed rated to 75mph, scuff guard built into the side wall in case you catch a curb, made in the US/Canada.
  • CnewbertCnewbert Posts: 456 Crazy Baller
    ... ditto all the above and be sure to look for the manufacture date on each tire. Take seriously the preceding advice on replacing any trailer tire at 4-5 years regardless of tread condition.
  • Ski_DadSki_Dad Posts: 518 Baller
    I run 50 in my 4 range C tires. 35 would not be right unless you have a pretty light boat.
  • 503Kento503Kento Posts: 175 Baller
    If it’s hot on you drive you should stop and check the pressure and make sure it’s not getting too high. You may need to take some air out during the high speed/temp portion of your drive. Obviously you would need to air them back up when things slow down/cool down,
    Get high, get fast, and do some good work
  • JmoskiJmoski Posts: 481 Crazy Baller
    @503Kento - it’s better to inflate trailer tires to the max psi when cold and just leave them. If your trailering long distance in extreme heat - taking pit stops along the way to let everything cool down is probably the better approach.

    Inspecting your bearings is just as important, neglected hubs result in as many trailer breakdowns as old or under inflated tires.
  • OREGON85OREGON85 Posts: 43 Baller
    If you had a blowout, you should probably buy 4 tires. Every trailer I have ever owned, when one went the rest were close behind.
  • ScottScottScottScott Posts: 1,384 Mega Baller
    Agree with @Jmoski. Pressure ratings are always given based on cold pressure (whether tire max rating or auto manufacturer specs,) they account for the heat increase on the road. In fact, a lower tire pressure will heat up more, which leads to many blowouts.
  • jhughesjhughes Posts: 1,221 Mega Baller
    edited 2:59PM
    The other day I was going down a major tristate tollway in IL and noticed a big bass boat on a tandem trailer- one of the wheels seemed cockeyed a bit. As I got closer the reason was obvious- one of the wheel hubs was riding directly on the axle spindle, metal on metal, zero bearing left whatsoever. So much so that the entire wheel was riding at an angle on the spindle, entire rim was dark from the heat, it was totally insane. The guy was probably going 80MPH, oblivious. I wonder how far he eventually made it. I had to pull off at an exit anyway before being able to warn him.

    So, check your bearings too, at every stop. Full re-grease every couple years depending on amount of dips in the water.
Sign In or Register to comment.