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  1. #1
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    New question here. New Cranks...New Chain...Old Cassette

    I just bought new cranks (Shimano XT M760) and a new chain (Sram pc-99), but I'm using my old cassette (Shimano XT M760). When I crank hard on the smallest two cogs, the chain slips a tooth. What's going on? Do I need to replace my cassette? I hope not, the cassette is less than a year old.

  2. #2
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    Since you've got a new chain and cranks I'd say your cassette is worn, not unusual. A year on a cassette isn't meaningful without mileage and use; I'd consider a year on a cassette pretty good (or that I'm not riding enough). In the future watch your chain, replacing it more often is usually more cost effective than rings or cogs...
    "...the people get the government they deserve..."
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  3. #3
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    thanks

    Dude, Thanks for the response!

    So that's it, I need to buy a new one? Is there a way to replace these smaller cogs that are the problem?

  4. #4
    Jm.
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    Yes, you need a new cassette. Chainstretch is what ruins the cassette and rings. This is why you get problems when you try to put a new chain on the system. To get more life out of the cassette and front rings, you should change your chain at least every 6 months if you are putting serious miles on your bike. It will preserve the rest of your drivetrain when you change the chain more frequently.
    I know in my heart that Ellsworth bikes are more durable by as much as double. AND they are all lighter...Tony Ellsworth

  5. #5
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    Will it cause a problem?

    Will is cause problems is I just live with the slipage for a while, or do I need to buy a new cassette asap?

    I mean I don't to mess up my new cranks, not to mention my new chain.

  6. #6
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    Use of a new chain on a bad cassette will accelerate wear on the chain, which will accelerate wear on your new crankrings...your choice.
    "...the people get the government they deserve..."
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  7. #7
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    Once upon a time I could stretch a chain and ruin a cassette in as little as 6 weeks.

    You have to change the whole drivechain or you risk damaging your new bits.

    Worn chain = new chain + new cassette + new chainrings

    It's an expensive change (or can be) and so it makes sense to wipe and clean the drive chain each and every ride, and maybe even during a ride (regardless of whether your friends laugh!).

  8. #8
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    Quote Originally Posted by dulyebr
    Will is cause problems is I just live with the slipage for a while, or do I need to buy a new cassette asap?

    I mean I don't to mess up my new cranks, not to mention my new chain.
    Buy a cheap Deore or LX cass...

    PS: when your Shimano chainrings wear out - try some Blackspire rings. They last for ages.

  9. #9
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    Chain

    I've been using a Sram pg-99. Would a cheaper chain be more durable?

  10. #10
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    Quote Originally Posted by dulyebr
    I've been using a Sram pg-99. Would a cheaper chain be more durable?
    The SRAM 99 chain is my favourite chain... though I am currently trying out a Rohloff. I snapped a few Shimano chains.

    I wouldn't go too cheap.

    The fact is that if the chain is worn then you must change the chain AND the cassette and the chainrings at the same time.

  11. #11
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    invest in a chain checker that way you can keep track of chain stretch and get longer cog life
    www.treefortbikes.com Just lauched V2.0 with free shipping and low prices!

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    good idea

    Quote Originally Posted by applegreenheckler
    invest in a chain checker that way you can keep track of chain stretch and get longer cog life
    Best idea I've heard all day.

    I just installed a new Sram PG-990 11X32 on sale for $40 at Performance. Too tired to ride, but it should be saweet!

    Thanks for all your advice fellas.

  13. #13
    Jm.
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    Quote Originally Posted by applegreenheckler
    invest in a chain checker that way you can keep track of chain stretch and get longer cog life
    aka a "ruler".
    I know in my heart that Ellsworth bikes are more durable by as much as double. AND they are all lighter...Tony Ellsworth

  14. #14
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    Quote Originally Posted by kronik
    Buy a cheap Deore or LX cass...

    PS: when your Shimano chainrings wear out - try some Blackspire rings. They last for ages.
    If you've got a wheelset with an aluminum freehub don't even consider a cassette w/o a one piece carrier (Sram 970 and below are bolted). I think the cheaper shimano ones are welded (which is good enough).

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