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Do I Need a Short, Medium or Long Cage Rear Derailleur?

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If you decide you want a bigger cassette on the back for climbing, chances are that you’ll need a longer rear derailleur that will keep the right amount of tension on the chain and clear the big sprocket.

With a fairly simple bit of math, you can determine the right size you need.

Global Cycling Network’s video also goes into the other considerations you need when switching gear ratios – chain length for example.

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