30 X 3-1/2" Firestone tire, all black, smooth tread

Firestone, all black tire. This black tire with no tread was the original style tread used on early Model T's. It has just a smooth rounded surface.
High pressure, beaded edge, clincher tires are made to be maintained at 50-60psi. Any less can cause the tire spin and cut of the stem, rib cuts and the possibility of tire coming off the wheel.
Fits the 30 x 3-1/2 size wheels
Tube Type 4 Ply Nylon tire.