UCI CYCLING REGULATIONS  Development teams of UCI WorldTeams and UCI ProTeams  2.1.005  Riders registered with a development team may participate in UCI ProSeries or Class 1  bis  events with the related UCI WorldTeam or UCI ProTeam subject to the following  limitations:  2.1.006 MU riders can participate in races classed as ME. WU riders can participate in races  classed WE.  2.1.007 Unless prior authorization has been obtained from the UCI Management Committee,  organisers may not set other age limits than the ones corresponding to the junior, under  23 and elite categories.  2.1.007 Obligatory invitations to events on the international calendar  bis  Provisions for Grand Tours and UCI WorldTour stage races  The organiser must invite the best UCI ProTeams on the UCI World Team Ranking, as  considered on the last day of the previous season (under the terms of article 2.1.001)$^{ (1)}$,  according to the followings:  Category of event  Number of riders allowed in the  UCI WorldTeam or UCI ProTeam  UCI ProSeries  Max. 2 riders  Class 1  Max. 4 riders  Category of event  Number of riders allowed in the  development team  Class 1  Max. 2 riders  Class 2  Max. 1 rider  Riders registered with a UCI WorldTeam or UCI ProTeam may participate in class 1 or  class 2 events with the related development team subject to the following limitations:  (article introduced on 23.10.19).  MU Races are reserved exclusively for riders of the MU category.  (text modified on 1.01.05; 1.01.07; 1.01.08; 1.01.15; 1.01.18).  (article introduced on 1.01.05).  Number of  UCI WorldTeams  Obligatory Invitation  of best  UCI ProTeams  (2) Remaining wild cards  for Organisers  Grands Tours  (3) Autres épreuves par  étapes  19  1  2  5  18  2  2  5  17  3  2  5  16  3  3  6  $^{(1)}$ For the purpose of this article, teams registered as UCI ProTeam or UCI WorldTeam during the  previous season are taken into consideration.  E170421  ROAD RACES  7 