http://www.google.com/products/catal...ed=0CGgQ8wIwBQ
They're around. Made mainly for e-bikes and many people say that they're not of they highest quality, but not hard to find.
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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"