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I am looking at getting a new cassette for my mountain bike ,and wondering if i need to change anything else(derailleur,shifter,chain)?

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    As well as chain (see answers), if shifting a problem, think about a new shifter cable. – mattnz Jun 26 '17 at 23:55
  • You need to narrow down the scope of this question with more explicit details on what your current drivetrain consists of and what you're looking to replace your cassette with. – joelmdev Jun 27 '17 at 2:45
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If you're getting a new cassette because it is worn, then you should at least get a new chain at the same time. You should also inspect your chainrings for wear and change them if needed. The derailleurs/shifters would only need to be changed if you get a different number of cogs on the cassette. They can wear out, but it's not usually in sync with the other items.

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    While doing your inspection don't over look the derailleur pulleys. Most are plastic with a simple sleeve bearing. – mikes Jun 27 '17 at 0:13
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New cassette needs new chain, but not really necessary. If your chain is pretty new (2-3months), you can keep your chain but make sure to give it a good degrease and regrease!

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