A time trial is racing at its most basic level, with just you, your bike, and the time to contend with. It tests the cyclist’s and machine’s ability against the clock.
A time trial bicycle (TT bike) has a shorter wheelbase, more aerodynamic, places the rider nearer towards the front of the bike in aero position. Besides, it can have solid disk wheels. It comes with some complexity and you need to know the tricks to ride a faster time trial.