Michelin Trans-World Cities in 1.5 or 1.95". They should do fine in gravel,have puncture protection,are easy to put on,and have reflective sidewalls. I ran a set this winter in the snow.
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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