I've heard it referenced as a tire or wheel???
Thanks...sorry for my ignorance.
It is a type of tire and rim that it gets mounted on. The rim has a deep lip curling in towards the center if the rim on either side and the tire has a bead that is designed to fit into the lip. Clincher rims and clincher tires require high tire pressure and are usually found on early cars. They were replaced by straight side tires and rims and eventually the lower pressure balloon tires.
Clincher refers to the type of rim and tire used on the cars until late 1925. The size tires are 30"x3" for the front and 30"x3 1/2" for the rear on the early cars, then went to 30"x3 1/2" on all four. These tires have a recognizable bead which fits into a groove in the rim and the tires get about 60PSI pressure.
The later rims and tires are called "Balloon" tires. They are size 4.50"x21" The bead is like that of a modern tire and the pressure is 32 PSI which gives a smoother ride.
The measurement of the clincher tires is the outer diameter and the width. Where the measurement of the balloon tires is width and the size of the inner diameter at the rim. The tires and rims are not interchangeable, but the outside circumference as almost the same.
High pressure of air in the tube keeps the clincher tire on its clincher rim.
Dan - Nice photo!
A "clincher" is also the last T you bought and gives your wife the evidence that you are addicted.