Shimano Freewheel

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f00dl3a
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Shimano Freewheel

Postby f00dl3a » Sat Dec 14, 2013 00:26 am

Do Shimano freewheels come by default with one of the highest geared teeth kind of sheared on one side of the tooth? I have a freewheel that I think is causing the chain to skip when in the highest gear because (I thought I caused it by improperly removing an old chain with plyers) it has a sheared tooth, but when I ordered a replacement on Amazon there is a tooth sheared in the same fashion. I returned this and the replacement they sent me has the same exact problem.

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supersonic
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Re: Shimano Freewheel

Postby supersonic » Sat Dec 14, 2013 01:09 am

Yes, the teeth are profiled.

MichaelW
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Re: Shimano Freewheel

Postby MichaelW » Sat Dec 14, 2013 02:28 am

Pre-worn teeth are a feature, not a bug; they aid snappy shifting with indexed gear levers.
It is usual for worn chains to skip with new freewheels. You should usually change the chain with the freewheel.

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The Rookie
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Re: Shimano Freewheel

Postby The Rookie » Sat Dec 14, 2013 05:10 am

Not pre-worn, profiled, shaped or formed!

As stated a worn chain with a new freewheel can skip, as can a new chain on a worn freewheel. Have you measured the chain wear?

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ScottishGeek
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Re: Shimano Freewheel

Postby ScottishGeek » Sat Dec 14, 2013 07:06 am

If it still skips after changing the chain it's likely your indexing needs a tweek.
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owenlars
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Re: Shimano Freewheel

Postby owenlars » Sat Dec 14, 2013 10:59 am

Over a few thousand miles a chain and a cassette wear together to create a mutually compliant shape where the chain and the cassette teeth engage. If you replace the chain without replacing the cassette you remove one half of this mutual compliance which means that the new chain, which does not have a shape that is compliant with your old cassette, is likely to ride up the old shape teeth causing skipping.

The way to deal with this is to change the chain every 1500 or so miles (or when your chain wear tool - any LBS will sell you one- indicates it to be necessary). In this way the you can get away with replacing the cassette every 5000-6000 miles. The alternative is to leave chain and cassette until they are both completely worn out and replace both at the same time. This link to Sheldon brown explains all.

http://sheldonbrown.com/chains.html

The profiled teeth on the cassette are entirely normal


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