Question about Sunrace 7 Speed Bicycle Freewheel Bike Parts 135

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The freewheel (8 sprocket, 24 speed) jams up and will not coast. I sprayed lubricant on it and it was okay for a short while, but same problem recurred almost immediately. Is there a simple solution? I don't want to get into a lot of expense.

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No big expense, I'd remove the back tire and then take apart the rear cassette and axel. I expect it will require a good cleaning and new lube.
I hope this may have helped,

Posted on Sep 25, 2009

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Only YOU can evaluate any error you may have made. LOOK at why the chain is slack. Does the rear derailleur pull back to take up the slack? Are you using some ridiculous small chainring, small rear cog combination that allows too much chain to go slack?

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The freewheel has a ratchet pawl (an internal, spring loaded lever) that would normally engage gear teeth in one direction and click over them in the other direction. This is just like the action of a ratchet wrench. You might have a broken spring or broken pawl - in which case you will have to replace the freewheel---- Or it might just be dirty. Spray some WD 40 inside it (spray through the small gap between the round part that moves and the round part that doesn't. If that doesn't work, you'll have to replace it.

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