Shimano chain change point.

milleman
milleman Posts: 181
edited November 2015 in Workshop
Hi

Can any one advise what the recommended maximum stretch is before Shimano advise that a chain is replaced?, have looked at the Shimano technical documents but cannot see it.

Thanks.

Comments

  • the_bing
    the_bing Posts: 11
    um, i'd use a chain measuring tool. about 6 quid or so.
    change chain at 0.75% 'stretch', change chain & cassette if chain 'stretch' at 1% or more.
    http://www.chainreactioncycles.com/cyclo-chain-wear-indicator/rp-prod42815?gs=1&gclid=CKCnip-KjskCFSQHwwodO0MJaA&gclsrc=aw.ds
    I don't know of a specific length measurement by a chain manufacturer. I go by my chain measurer :D
  • milleman
    milleman Posts: 181
    Thanks for the reply.

    I have the Park Tools chain measuring tool (great piece of kit), but just wasn't sure if the recommended change stretch was 0.5 or 0.75%.
  • sungod
    sungod Posts: 17,344
    a simple 12" steel ruler is more consistent than smaller measuring tools

    in a length of chain, there will be a pair of rivet centres at 12" separation, as the chain wears, this separation increases

    when the distance between a pair reaches 12 1/16", it's time to change the chain, beyond this point the wear of the cassette will accelerate, the longer this goes on, the more likely a new chain is to skip on some cogs (the ones you use most)
    my bike - faster than god's and twice as shiny
  • Anonymous
    Anonymous Posts: 79,667
    Chains are cheap. If in doubt, buy a new one. Better than guessing and prematurely wearing your chainset and cassette.

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