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Recently I have bought a used 2012 Cube CLS LTD PRO hybrid bike in a good condition . The only thing was the rear cassette a little wobbling. I asked a mechanic about this and he told that almost every bike has this problem . After riding about 300 km I noticed that the cassette is wobbling more than it had been. Today I took the rear wheel off and saw that the cassette had a tiny backlash on the wheel . Can I fix the wobble simply by tightening the cassette , or should I buy a new one ?

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What do you mean by "backlash on the wheel"? –  Daniel R Hicks Aug 18 '13 at 19:30
    
the cassette has a little play on the rear hub –  Abrahamyan Samvel Aug 19 '13 at 7:48
    
THAT should not happen. If the cassette is already fairly tight, check whether the cassette is even compatible with the freewheel. –  arne Aug 19 '13 at 10:05
    
It sounds like the cassette is falling apart, or has been misthreaded. –  Daniel R Hicks Aug 19 '13 at 11:09
    
"backlash" refers to "gear backlash": which is a jerking effect caused by free play in a moving transmission; it is not a synonym for free play itself. –  Kaz Aug 21 '13 at 0:06
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Wobbling cassettes should be absent from, not present on, every bike. It is possible that the wobble is caused by worn splines on what might be a soft (aluminium, as opposed to steel) freehub. I myself recently blogged about such an issue at http://bit.ly/HubTrouble .

The wobble might instead be a result of an incorrectly seated lock-ring, or a missing spacer from behind the cassette (in which case you might find this link of interest: http://bit.ly/CassetteIssues)

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