Rear derailleurs
53The rear derailleur guides the chain precisely over the cassette and largely determines how smoothly you shift gears. A well-functioning rear derailleur is tuned to your shifter, chain and cassette, and designed for the same number of gears. When choosing a rear derailleur, the right combination of components is important, as is the difference between road and MTB systems, which often use different technology and gear ratios.
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