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Bicycle Mechanics Broken bottom bracket? Tacoed wheel? If you're having problems with your bicycle, or just need help fixing a flat, drop in here for the latest on bicycle mechanics & bicycle maintenance.

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Old 05-10-06, 08:46 AM   #1
markh
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rear hub Broken?

My rear hub has lost conection with the rear caset. My cranks and chain spin but the bike does not move. Can this be fixed or does it mean a new rear hub?
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Old 05-10-06, 08:51 AM   #2
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The freehub pawls are not engaging. Eiither the freehub is really dirty inside or something is broken.

Try adding some light oil to the seam where the inner stationary "core" and the rotating outer shell meet to see if helps. If not, the freehub body has to be replaced. They are fairly inexpensive and don't require a new wheel.
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Old 05-10-06, 09:22 AM   #3
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At least, they're easy to replace if it's a Shimano hub (and possibly in the case of a Campagnolo as well). Various other hubs require special tools to remove the freehub body, and some can't be serviced at all.

If the hub is a shimano, and light oil (even ProLink or something like that) doesn't clear up stuff inside the freehub mechanism, and you need to replace the unit, a 10mm allen wrench loosens the bolt that holds the freehub to the main hub body. You'll need to remove the hub's axle in order to get in there.
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Old 05-10-06, 09:30 AM   #4
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The freewheeling mechanism is in either an old-fashined screw-on freewheel or a modern splined freehub.
Freehubs can be serviced but are usually replaced. You dont need to replace the whole hub.
Here are some illustrated instructions for repairing various freehub units.
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Old 05-11-06, 10:47 AM   #5
markh
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It is a canondale fire hub for my xc bike. but i dont think cannondale made it in house.
thanks for you help.
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