Early Bicycle Wheel Rim, Spokes, and Hub

Early bikes used a tire that was basically tubular, and was glued to the curved side of a rim.  The glue and air pressure in the tire held the tire to the rim.  This type of tire was later called a "sew-up" because a tire was sewed in place around the tube, and the tube and tire were glued to the rim.  This is a pretty good illustration of an early bicycle tire design.