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Bikes with external gears are available in two different rear wheel designs. One is called a freewheel, in which the sprocket cluster together with the one-way clutch that makes coasting possblke is treated as one unit. The other is the freehub design, where the one-way clutch and the sprocket cluster are treated as separate units. With a freewheel you replace the chutch bit too when the sprockets gets worn, with a freehub you only replace the sprockets.

Freehubs also have the bearings further apart which makes them less prone to bending/breaking the axle.

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Q: What is a freewheel gear design on rear bicycle wheel?
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How do you get mongoose rebel back gear off?

Depends on if it's a freewheel or a freehub design. For a freewheel you need the appropriate freewheel puller. For a freehub you need a splined lockring tool.

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I'm assuming you're asking about how to remove the freewheel, as the Mongoose Rebel 20 is a single-gear BMX. In that case you need the correct freewheel puller to get the freewheel off. Check out for more info.

Will a 13tooth freewheel work with a 25 tooth sprocket?

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