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SUBJECT: # 7733: How much air pressure should trailer tires be kept at?

Submitted by Neri ( from MISSOURI on 6/13/2002 3:52:00 PM

I have a Tandem trailer my tires say 50 PSI cold, should I inflate them to this pressure? I have been carrying about 45 PSI.

  1. 6/13/2002 5:27:00 PM Submitted by Ron1 from NORTH CAROLINA says Depends
    How is the wear pattern on the tires? Are they wearing even across the tread? If the outer edges show more wear increase the pressure to the max rating on tire. If the center only is wearing fastest, lower the pressure a couple lbs and check again after a few trips.

  2. 6/13/2002 7:13:00 PM Submitted by Bucket ( from CALIFORNIA says What is your load?
    Trailer tires are rated at a specific load for a given pressure, generally 1300-1700 pounds of load per tire or so. If you are not at that pressure, you should not run with that load. You should know what the load rating is for your tires and what your rig weighs, divided by 4. If you are approaching the load limit on the tires, I would inflate them to specified pressure.

  3. 6/14/2002 9:42:00 AM Submitted by B Hogg ( from LOUISIANA says tire pressure
    After doing a lot of research on trailer tires, I was told by one manufacturer to always air them up to the maximum shown on the tire. The main cause of tire failure is heat build-up. The less a sidewall flexes, the less heat build-up there is. This is especially true with radial tires. The same manufacturer said the reason that they make both radial and bias ply tires is from a marketing need. His personal preference was for the radial. I currently run radials on my rig (approx. 7,000) and air up to the full 65# shown on the tire. Bill

  4. 6/14/2002 10:17:00 AM Submitted by MarkW ( from ALABAMA says Read the manufacturers info plate
    Trailer tires, just like car/truck tires, have a maximum cold inflation value imprinted on their sidewall. However, that's not always what they should be run at. The trailer manufacturer should have affixed a spec plate that tells you what inflation value you should be using considering the trailer weight, boat weight, etc. May turn out to be less that the tire max psi. However...if you're operating the dark w/o such info...I'd run close to max cold psi and adjust based on any wear patterns that develop (per Ron1's message above).

  5. 6/14/2002 2:01:00 PM Submitted by Neri ( from MISSOURI says Thanks guys for all the info
    Thanks for all the info

  6. 6/15/2002 9:03:00 AM Submitted by Alex from GA from GEORGIA says Pressure.
    Load range B-35 psi C- 50 psi D- 65 psi

  7. 6/15/2002 1:25:00 PM Submitted by miker ( from FLORIDA says pressure
    agree with hogg, blow those suckers up's a rare thing to find a pressure related wear pattern on trailers.higher pressure will reduce heat and most likely increase milage.trailer tires usually fail from overloading,overheating,or old age dry-rot long before tread wear is a problem.also on a tri-axle trailer,rolling tire off bead with a low speed turn is more likely when pressure is low.

  8. 6/16/2002 11:25:00 AM Submitted by Lee ( from TEXAS says caution on max pressure
    I carry max pressure (50 psi) but I blew out a tire last week due to overinflation from a junk tire guage. Showed 50, but a better guage showed 63 psi! If you are going max pressure, and I agree that you should, make sure your guage is really accurate. A $3 one from the parts house doesn't cut it. Get a Milton dial guage from your tool supply house for around $20. Better than a new tire.


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