Swobo Otis. Little pricier,but the 3sp hub is low maintenance,as is the rear coaster brake. Has room for knobbie tires if they want to do some light trails,will take rear rack and fenders. Light and tough,and doesn't look fancy enough to steal.
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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