Chain Wear.

toddcity
toddcity Posts: 2
edited November 2015 in Workshop
Hi,

First time post here. Just bought a bike online recently, took her out for the maiden voyage and something didn't feel right. Upon closer inspection post ride I noticed some pretty intense chain wear picture here, UJGD9Fv.jpg

One other thing I noticed is the bike is set up with a dura ace 7900 10 speed groupset, yet the rear cassette is a 11 speed. Would this be the thing contributing to the chain wear or shouldn't it make that much of an impact?

Cheers

Comments

  • Bobbinogs
    Bobbinogs Posts: 4,841
    [url=http://www.bikeradar.com/forums/viewtopic.php?p=19734242#p19734242]cyd190468[/url] wrote:
    Those chamfered edges are actually part of the chain design.

    Yepp, and chain "wear" is predominantly measured objectively using length as a percentage of normal length (as in 1 inch for 1 full link, so that is a roller every half inch). Most folks would consider 1% to be worn and .75% to be on the way. Less than that and the chain is fine.

    As an easy guide, 1% for 24 links measures 12 & 1/8 inches
  • keef66
    keef66 Posts: 13,123
    Is this a new or a second hand bike?

    You sure you have an 11 speed cassette with an otherwise 10 speed groupset? ie you have only 9 clicks at the shifter so there's a sprocket completely unused??

    If the chain is 10 speed I wouldn't have thought it would mesh cleanly without fouling the adjacent sprockets. Or is that what's happening? The side plates do look like they have had a lot of scuffing...

    Measure chain wear cheaply using a ruler; as mentioned 12 full links should be 12 inches exactly pin to pin.

    I find that too tricky so have a chain wear checking tool which is simple and quick to use. Some people don't like them because they include roller wear, but I think it's close enough.

    Replace chain at 0.75% wear and you'll probably get 3-4 chains before you need to replace the cassette too.

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