tire wall separation

Ezbagr wrote:

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There are 10`s of millions more car and truck tires going down the road compared to ST tires. I will guarantee that percentage wise the car-truck tires that fail are a fraction of the ST failures. Why is it?

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One major reason PSR failure rate for most brands made in almost any country is less than 0.05% is because the vehicle manufacturer isn't buying the smallest, lowest cost tire that will meet the minimum standards for load capacity.

Most cars when they leave the factory have 20% to 50% reserve load (excess capacity). All cars made over the past 7 years or so also come with TPMS. Many car companies warranty the entire vehicle for 3, to 5 years with drive train at 5 to 10 years while RV manufacturers can't seem to hook up a 12 volt system that is good for more than a few months.

IMO US RV manufacturer's quality make Harbor Freight tool quality look like the best tools in the world. Even China Bombs last longer than a new RV before something fails.

Most cars never see 60% of the tire max speed capability either.

Finally the side loading of tires on passenger and pickups runs about 24% lower than the side loading of multi axle trailers.

Add all of these facts together and I think you may understand part of the reason ST tires have a higher failure rate.


If you have a complaint about the old, out of date load formula and guidelines used for ST tires, that ignores the unique tandem axle loading I would suggest a few hundred letters to
The Tire and Rim Association, Inc.,
175 Montrose West Avenue, Suite 150,
Copley, Ohio, 44321
and
NHTSA Headquarters
1200 New Jersey Avenue, SE
West Building
Washington, DC 20590

telling them that the tables and guidelines that were OK for trailer design in the 60's needs updating.

Of course NHTSA will look at its records and see almost zero actionable complaints on file so they will probably dismiss your letters.