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Long story short, when racing I have (had) a tendency to drop the chain; like a lot, even with a narrow-wide. A worn chain and sprockets more than likely didn't help my cause, but I bought one of these puppies and have been handsomely rewarded for my efforts. Through two normal riding days (which I rarely ever dropped chains anyway), a race practice day and the actual race; I can report no dropped chains. The guide came with everything needed to get up and running. Set up was supereasy; I didn't need any of the spacer for the chain line...