Did you used to have a fixed gear wheel and now you have a single speed, so before when you pedaled backwards the wheel would move that direction and now it just coasts?
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Bikes: 1996 Eddy Merckx Titanium EX, 1989/90 Colnago Super(issimo?) Piu(?), 1990 Concorde Aquila(hit by car while riding), others in build queue "when I get the time"