Changing chain and sprockets is quick once you get the front sprocket loosened, but that step can suck. Getting mine off required far more than five minutes, and culminated with a hulk smash on a 5 foot breaker bar. Not saying you shouldn't do it yourself, but don't think you'll be done in 5 minutes.
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bike * miles = smiles
smiles / bike = miles
smiles / miles = bike
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