with the overall winner at the end of the season may keep the jersey and wear it at the World Championships. Riders compete for either national teams or trade teams, though the future of trade teams is unknown after controversial decisions by the UCI to eliminate World Cup events, and replace them with Nation's Cup events. Ranking The UCI Track Cycling World Ranking is based upon the results in all UCI-sanctioned races over a twelve-month period. The ranking includes an individual and a nations ranking and includes the disciplines: individual pursuit, points race, scratch, sprint, time trial, keirin, omnium, team pursuit, team sprint and madison. Gender in track cycling Women's track cycling was only introduced as an Olympic sport in 1988, and women were not permitted to compete in the same number of events as men until 2012. Though men and women currently compete in the same number of events, there are still significant differences between men's and women's races of the same type. For example, in the team sprint, men race three riders over three laps, whereas women race two riders over two laps, and men's individual pursuit is a 4 km race and women only race 3 km. It is also the case that women race shorter distances than men in mass start events such as stand-alone scratch and points races, and omnium events. In many cycling sports, women raced shorter distances, are paid less, and receive less air-time. It was not until 2018 that the UCI mandated minimum wages for women's cycling at all. It is unclear how this will impact female track cyclists, as track cycling is generally not an athlete's primary source of income (rather they are road cyclists selected for specific events by their national team). There is no talk of changing race distances to create gender parity in time for the 2020 Olympics. In 2018, Veronica Ivy (then known as Rachel McKinnon) became the first transgender World Champion in any sport, with a victory in the Masters Women Age 35-44 age category. In 2019, Ivy became a repeat champion in the same discipline. Though met with some criticism, Ivy holds her title as transgender athletes are permitted to compete as per the International Olympic Committee. Riding position Aerodynamic drag is a significant factor in both road and track racing. Frames are often constructed of moulded carbon fiber, for a lightweight design. More recently,