>I learned my spanish in Nicaragua, Panama, and Spain. I always used the word mesero or mesera.
>
>I would love to hear from the native speakers which would be more correct. It is the same with the word for tire: pneumaticos, gomas, or llantas, depending on where you are.

Right. "Mesero/a" is correct too, depending on where you are.
You are correct on "tires" too.