I have heard and seen a few pictures of some Keirin racers' training bikes that are track frames equipped with brakes, shifters and derailiuers? Would it be a good idea to have a track frame equipped this way or should I just purchase a road bike? I really like the way my track frames feel so I thought this would be a good alternative as opposed to a road bike. Your thoughts please, pros and cons?

Thank you,
TDHK