A prone bike is a recumbent bicycle which places the rider in a prone position. The bottom bracket is located at the bicycle's rear, the rider lies either on a pad or in a hard-shell seat. The rider's position reduces drag and therefore increases the speed of the vehicle. Most prone bikes are do-it-yourself constructions. There are only few series-production models.
The first prone bike was developed and marketed by the American company Darling in 1897.