On Sun, 10 May 2015 07:38:00 -0700 (PDT), Uncle Monster
wrote:

On Sunday, May 10, 2015 at 9:27:07 AM UTC-5, Ron in NY wrote:
micky wrote:

OT I ended up with a pair of tires that only go in one direction. I
want to learn about these things but I don't know what they are called.
What are they called.

They are called directional tires. They provide better traction when spinning in
the proper direction.
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I believe I first saw those tires factory supplied on the Corvette. 8-)

[8~{} Uncle Tire Monster
They were very common on farm tractors and road building equipment
long before the 'Vette saw them!!!