I got into riding fixed a few months ago, after I had one of the mechs. at my LBS convert my old Raleigh Grand Prix. It cost about $200. This included new rear flip flop hub wheel, front wheel, chain, flipped bars, Armadillo tires and pedals and straps. After I threw the chain last week, I took it back and he replaced the old cottered cranks, chainring and put on new bottom bracket. This cost another $40. I love the bike, and it's all I've been riding for the last few months. I know that I wouldn't have spent what it costs for a new track bike just to find out if I like riding fixed or not, but I see that the conversion was a series of compromises. I notice that the the chain sort of "hops" on every revolution, the chainline looks straight to me, but feels just slightly too slack, but when I tighten up by pulling back the wheel, it makes noise and doesn't spin as freely. I like that the bike has personality, being one of a kind, but maybe a new bike would have been the way to go, in hindsight. Anyway, looks like maybe I'm ready to step up to a new bike, maybe go in on the Iro deal. any comments by some who have been through my experience would be appreciated.