A cluster of sprockets, commonly 5 to 11 of them, attached to a freehub on the rear wheel.

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What range of sprockets is useful in a road bike cassette?

My road bike currently has a 27/39/53 crankset and a 13-26 cassette, both of which need to be replaced. I occasionally find myself in both extremes—while heading up the very steep hills of the Bay ...