Take the 2-minute tour ×  Trackstands (a trick in which a rider,
usually on a fixed-gear bike, keeps balanced with zero speed, by
pedalling back and forth with minimum displacement) can be
employed either on the track or on the streets, mainly at
traffic lights.  In the track, the rider can slow down and
create a hard time for an opponent. On the traffic light, one
can keep himself on the bike and be ready to go. That makes the
trick "desireable", so it is either regulated on official
events, and used itself for "trackstand competitions", mostly in
the fixie subculture.  What I have to ask is:    • What are the
UCI criteria for the judge to stop the countdown for trackstand
duration?   • What are the criteria traditionally used on
informal competitions for taking a "competitor" out?   • What
SHOULD BE a reasonable way to tell when a rider degenerated from
a correct trackstand to something else (forward or backward
movement, too large a change in position, etc.)?  Thanks for
reading!  share|improve this questi