How to Disassemble a Bicycle Freewheel
A bicycle freewheel, or "cassette," is a cluster of various-sized sprockets that serves as a portion of a bicycle's gearing. When rear gears are shifted, a mechanism called a derailleur transfers the chain onto the selected sprocket. Freewheel removal requires a specialized tool commonly called a "freewheel removal tool." Depending on the manufacturer of the freewheel, the required tool will differ in design. A local bike shop typically will offer a selection of freewheel removal tools. The freewheel is disassembled with the rear wheel removed from the bicycle.
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Instructions
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Place the wheel upright on the ground with the freewheel facing away from you.
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Insert the proper freewheel removal tool through the center of the freewheel.
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Adjust a crescent wrench to fit snugly onto the flat portion of the freewheel removal tool. Hold the crescent wrench handle near the 10-o'clock position.
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Attach the chain-end of a bicycle chain whip tool to any one of the sprockets that comprise the freewheel. Hold the handle of the chain whip near the 3 o'clock position.
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Push the handles of the two tools simultaneously toward the ground, loosening the lock ring that holds the freewheel in place. Set both tools aside once the lock ring gives.
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Unscrew the lock ring from the freewheel, and set the lock ring aside.
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Grasp each sprocket and spacer that comprise the freewheel. Lift them from the side of the wheel. Each part will come away freely.
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References
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