A time trialist is a road bicycle racer who can maintain high speeds for long periods of time, to maximize performance during individual or team time trials. The term cronoman, or chronoman, is also used to refer to a time trialist.

Road bicycle racing is the cycle sport discipline of road cycling, held primarily on paved roads. Road racing is the most popular professional form of bicycle racing, in terms of numbers of competitors, events and spectators. The two most common competition formats are mass start events, where riders start simultaneously and race to a set finish point; and time trials, where individual riders or teams race a course alone against the clock. Stage races or "tours" take multiple days, and consist of several mass-start or time-trial stages ridden consecutively.