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A freehub is attached to the rear hub of your bicycle. It is a spinning mechanism designed to hold the cassette. Coasting when the pedals are at rest and pedaling are possible thanks to the freehub.
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When do I need to replace my freehub body?
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If your cassette cluster is loose or stiff, it is time to service or replace the freehub body.
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How do I replace my freehub body?
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Start by removing the cassette.
To remove the cassette:
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Remove the rear wheel skewer by holding one end and turning the other counterclockwise.
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Insert the proper cassette lockring tool into the notches on the cassette.
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Replace the skewer and tighten it to keep the lockring tool in place
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Hold the cassette stationary by wrapping your chain whip around one of the cogs.
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Attach an adjustable wrench to the hexagonal portion of the cassette puller.
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Continue holding the cassette stationary with the chain whip while turning the adjustable wrench counterclockwise.
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Once the lockring holding the cassette in place starts to give, remove the skewer holding the lockring tool in place.
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Continue turning the lockring counterclockwise until it is completely removed.
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Slide the cassette straight off of the freehub body.
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To replace the freehub body:
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The freehub body will be attached to the rear axle by either an allen bolt (probably 10mm) or hex bolt. Simply loosen this bolt and slide the freehub body away.
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Clean the hub and bolt by which the freehub body was attached.
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Place new freehub body onto the splines on the hub.
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Replace the bolt and tighten it.
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Re-install your cassette. For more information on this procedure, see our article “How to Replace a Bike Cassete.”
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