truth be told, keirin frames aren't much different than the track bikes the Jamaicans started riding in NYC back in the day. and like all great trends, it got watered-down. thus, track looking frames with road geometry. maybe, just maybe, the current popularity of keirin frames doesn't have anything to do with being a hipster, it has to do with people who want quality lugged track frames, that handle like track frames, to ride around an urban environment.