Wiktionary
gearless
a. Without gears.
Usage examples of "gearless".
Nor do I think he was really afraid of the numerous troubles on the rocky road ahead, not even of getting stranded gearless in this primitive anarchy of a nation.
I experienced this at first hand only a month ago when, on holiday in Sweden, I mounted an elderly, gearless - and handbrakeless - machine for the first time in some thirty-five years and took off on a fifteen-mile ride.
Since the total outlay was 135 percent, Calvin remedied the situation by letting the Mercedes be repossessed and buying a secondhand gearless Schwinn bicycle which he rode back and forth to work.
Four recently invented, gearless electric elevators with push-button controls.