The taller a rider's center of mass, the shorter the distance. The length of the path of a rider's center of mass in a turn depends on the height of the rider's center of mass. The greater the height, the shorter the path in the turn. The shorter distance contributes significantly to faster times. It's not just that powerful riders go faster, they also travel a shorter distance through the turns.
Times depend on the configuration of the velodrome.
This gives different radii and different speeds for nominally the same path. Speeds in the turns are faster because potential energy is converted to speed as the rider leans. This is offset by increased drag from the faster speed. The rider looses this speed when potential energy increases in the straights. One sets up the model by first defining a velodrome.