Greg Arnold wrote:

jcarlyle wrote:
At least we agree that using P rated tires on a trailer isn't a good
idea!

I don't understand why a P rated tire that can travel 15,000 miles a
year at 80 mph on a car would not be suitable for a trailer traveling a
few thousand miles each year at 65 mph (or, for that matter, a trailer
traveling 15,000 miles a year at 80 mph). What am I missing?

My guess is people that have problems with P rated tires are choosing
ones that don't have a high enough speed rating; i.e., "cheap" tires. I
have no documentation for this, just my observation that a lot of pilots
don't think the trailer deserves good tires, especially on trailers that
are used only a few thousand miles a year.

They may also be choosing P rated tires that don't have the load rating
of the original tire. This is particularly likely to happen if the
original was an ST tire, and they put on the same size P rated tire
without realizing it has a lower load rating.

It would be interesting to collect tire type, size, pressure, age,
trailer weight, and towing speed for 50 or so trailers, just to see what
people are doing.

--
Eric Greenwell - Washington State, USA
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