My Speed Pro TT came with them. They give you most of the positions of a drop bar,but fold better. You'll want a stem that allows you to fold them. The early SPTT's had them,but mine requires me to carry a hex wrench to loosen the stem bolts.
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C'dale BBU('05 and '09)/Super Six/Hooligan8and 3,Kona Dew Deluxe,Novara Buzz/Safari,Surly Big Dummy,Marin Pt Reyes,Giant Defy 1,Schwinn DBX SuperSport,Dahon Speed Pro TT,Brompton S6L/S2E-X