For bicycles used on extremely smooth elliptical tracks indoors, this bicycle has no brakes (for braking), no transmission, and no reversible flywheel.
Triathlon/Time Trial bicycle (Triathlon/Time Trial bicycle) is a road bicycle used in triathlon and time trial sports. The biggest feature of triathlon and time trial is that draft is not allowed, that is to say Riders must use their own strength to overcome the air resistance and are not allowed to ride behind other players. Therefore, the triathlon/time trial bike is designed with great attention to keeping the rider in a riding posture that reduces air resistance, while paying attention to the reduction. The air resistance of the small bicycle itself. Triathlon bikes also allow riders to use similar muscle groups when riding and running, which makes it easier to switch from riding to running.