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Holds your chain on your chainring.
Unless you are doing bat-shit-crazy downhill stuff, or using a single chaining ring with an older clutchless derailure you don't need one.
Howard-
Thanks man, will be doing neither of those things.
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Think a chain keeper would make much difference if you don't have much mud clearance out back? Or perhaps it's just another thing likely to get snapped off?
I ask out of curiosity because @spotter dropped his chain two or three times this weekend on totally flat ground, despite running a narrow-wide Superstar components chain ring and a clutched rear derailleur.
Granted it was super muddy and very leafy, but my Inbred was trouble free running the same rear Nobby Nic tyre, same Zee rear derailleur, Hope narrow-wide ring up front. The only difference seemed to be clearance; I have tons whereas the Cannondale doesn't.
mi7rennie
Dom
My main remaining question is what is a 'chain device' and do I need one?