On a related note, my bike has a front keirin clamp on brake, which is one reason I try to use it sparingly. It works fine and the front fork is fine also, even after all the abuse I dished out on it.
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1989 Schwinn Paramount OS
1980 Mclean/Silk Hope Sport Touring
1983 Bianchi pista
1976 Fuji Feather track
1979 raleigh track
"I've consulted my sources and I'm pretty sure your derailleur does not exist"