etiquette

etiketti The forms required by good breeding, or prescribed by authority, to be observed in social or official life; observance of the proprieties of rank and occasion; conventional decorum; ceremonial code of polite society.
The customary behavior of members of a profession, business, law, or sports team towards each other.
2012, July 15. Richard Williams in Guardian Unlimited, http://www.guardian.co.uk/sport/2012/jul/15/tour-de-france-2012-bradley-wiggins Tour de France 2012: Carpet tacks cannot force Bradley Wiggins off track

Cycling's complex etiquette contains an unwritten rule that riders in contention for a race win should not be penalised for sheer misfortune.