There's an interesting variety of record categories for bicycle speed; this is the very fastest one¹.
motor-paced/unpaced: do you have a motor vehicle providing aerodynamic assistance in order to reduce air resistance?
downhill/level ground: do you ride your bicycle on a flat surface or down a mountain?
faired/unfaired: do you have a canopy attached to your bicycle to reduce air resistance?
recumbent/upright: do you ride your bicycle lying down or sitting up?
indoor/outdoor: do you ride your bicycle outdoors or on a velodrome track?
¹ Wikipedia also describes a treadmill record in which the cyclist encounters no air resistance at all, only friction between the bicycle and the ground and mechanical friction within the bicycle. That record is 207.9 MPH (!).