It works. I have used on 2X and 1X. Quieter, better shifting, stopped chain slapping, but best of all it really stopped the chain from falling off. I didn't notice any drag or resistance. Super easy to put on. Literally takes a minute. You don't have to break the chain. You can easily put it on or take it off at the track. Very useful for those of us with low end derailleurs that don't have a clutch.
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