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Slick
From WikiPedalia
"Slick" or "bald" tires, those with no tread pattern, or perhaps just a bit of siping, provide the best performance for bicycles which are used on pavement.
Slick tires are smooth and silent-running, and have excellent traction. They have the lowest rolling resistance of all tire styles. Many people reject them because they look slippery, but in practice, they are not. Tread patterns on road tires are purely cosmetic, and have no practical value on hard, paved surfaces.
