Recumbent bicycles have been banned from competitions by the UCI since 1934 because their design has aerodynamic advantages over normal bicycles and competition results are thus distorted. Why does Strava allow a mix of recumbent bikes and regular bikes on the leaderboards for cycling activity type? With a normal bike (diamond frame design) in most cases you have no chance of getting first place in the leaderboard when you have to compare yourself to a rider on a recumbent bike who can achieve a higher sustained speed with less power, this makes the leaderboard unusable for activity type cycling.