Shimano makes chain guards for some if it's cranksets(my Crosstrail has one,ordered one for the Safari),but TruVativ only makes them for their MTB sets.
You could try one of these:
http://www.koolstop.com/Accessories/...nchor-Extra-57
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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,Brompton S6L/S2E-X/M6L-X/S12 T Line
