Originally Posted by
rex615
A track frame has to be stiff because sprinters can generate a lot of power, they usually don't like frames that flex too much because they feel it robs them of efficient power transfer to rear wheel. If this comes at the expense of a few more grams in the frame, it is a worthwhile trade-off for them.
Also, track bikes can't weigh less than 15lbs according to UCI regulations. Some riders actually add extra weight to their bikes in order to meet this requirement, so an ultra-light frame in a discipline which removes so many mechanical parts from the bike is kinda pointless.