Brixton cycles and Brick lane bikes are your best bet for fixie stuff. But you could also DIY quite easily especially with an old 10spd frame, but it can be quite frustrating.
See: http://sheldonbrown.com/fixed-conversion.html and http://sheldonbrown.com/deakins/how-to-fixed-conversion.html (but I wouldn't go the suicide hub route, get a proper track hub)
http://www.53-12.com and Bricklane bikes are the best people to talk to about Velocity stuff.
[Pretty much what Hovis said...]
@pip started
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Brixton cycles and Brick lane bikes are your best bet for fixie stuff. But you could also DIY quite easily especially with an old 10spd frame, but it can be quite frustrating.
See: http://sheldonbrown.com/fixed-conversion.html and http://sheldonbrown.com/deakins/how-to-fixed-conversion.html (but I wouldn't go the suicide hub route, get a proper track hub)
http://www.53-12.com and Bricklane bikes are the best people to talk to about Velocity stuff.
[Pretty much what Hovis said...]