frame geometry
The term steeper geometry refers to the head tube angle which moves the forks into a more vertical alignment than a standard road or touring frame. The rear triangle is shorter due to the seat tube being a slightly different angle than the other type also. The combination of those factors makes for a quicker handling bike that is an advantage in a velodrome setting. It also makes for a harsher ride, but that is not of concern in the short races that take place on a velodrome.
fixedgearhead