Cycle-ball, also known as "radball" (from German), is a sport similar to association football played on bicycles.

The two people on each team ride a fixed gear bicycle with no brakes or freewheel.

The sport was introduced in 1883 by American artistic cyclist, Nicholas Edward Kaufmann.

[1] The first match was played on September 14 that year between Kaufmann and fellow artistic cyclist John Featherly.

[1] The most successful players were the Pospíšil brothers of Czechoslovakia, world champions 20 times between 1965 and 1988.