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Bike repair: new chain ring(s) / set? new rear cassette?

  • 26-03-2012 11:16pm
    #1
    ucdier
    Registered Users, Registered Users 2 Posts: 37 ✭


    Hi,

    I bought a road bike just over a year ago now. Im a fair weather cyclist and I don't know a lot about bike maintenance. Learning as I go I hope. With the recent good weather I'm looking to get my bike out and cleaned up, and get riding again.

    When cycling last year, the chain slipped a fair bit, and unfortunately I didnt do much besides trying to make some minor adjustments to the derailer, and oiling it.

    I was concerned the teeth on the chain ring was worn down, so went into (Dublin) town today to price a general service and replacing the ring, but was told that the ring is the strongest part of the drive train, so may need to replace the chain set, the chain and the rear cassette. Looking at over €150 in repairs anyway, before the general service.

    Anyway, to be fair, the guy was sound and said for me to bring it into him as it might not be that bad at all. Obviously picked up that I was a novice. I was just looking for opinions and to get some input before I head in again. So I don't sound like I have no clue at all.

    In summary:
    Problem: gears were slipping, and to me, it looks like chain ring needs replacing.
    Question: - based on the pics attached - any recommendations and guidelines for prices to fix it? Would a good clean, service and proper tuning do the job? Or replace most parts of drive train required.

    Cheers in advance

    Chainset

    photo2_front.jpg

    Rear cassette

    photo1_rear.jpg


Comments

  • #2
    Beasty
    Administrators, Social & Fun Moderators, Sports Moderators Posts: 78,393 Admin ✭✭✭✭✭Beasty


    What distance have you done? The chainrings should last a lot longer than the cassette. They typically have "unever" teeth - it's part of the design to make changing from one ring to the other smoother. If the cassette has worn (you should be expecting perhaps 3,000km or more out of one), you will need to change the chain as wel.

    It may, however, just be the chain that could need replacing. If you change them soon enough the cassette will probably survive a second (or even third) chain

    Sheldon Brown has more on chain and sprocket wear


  • #3
    rab!dmonkey
    Registered Users, Registered Users 2 Posts: 634 ✭✭✭rab!dmonkey


    Definitely looks like you'll need to replace the chainrings, cassette and chain.

    This has happened because you allowed the chain to wear too much, which lengthens the pitch (the distance from one pin to another) of the chain. As the chain wears and the pitch lengthens, the chainrings and cassette wear to accomodate the chain. Of course this means they will no longer accomodate a new chain with the proper pitch.

    It's important to check chain wear regularly and replace it as neccesary. This will lengthen the life span of your cassette and chainrings. Sheldon Brown explains this very well - check the section on measuring chain wear.


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