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I have a Shimano SIS chainset on which has now done 3000 miles hence the teeth are wearng and requires replacement. I've tried using a chainset extractor tool but it will not budge. Is this the correct method - looks like a normal square taper bottom bracket - or can anyone else suggest what to do or where I'm going wrong?

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Let's see, chain, teeth and bottom brackets. Three different

I think you mean chain rings with worn teeth and you're trying to remove the crankset to get at the chainrings. Crank removal may not be necessary to change the outer rings. In my experience the most-used chainring is the only one that wears out fast. You may be able to just buy one or two rings, or a whole crankset may end up to be more economical, depending on where you shop.

Special tools are necessary for non-destructive removal of the cranks.

Find your style of crank and bottom bracket in here.

http://www.parktool.com/blog/repair-help/categories/crank-service

If your chain is that old that it's wearing the teeth your whole drive train will need replacement - chain, cassette and chainrings. If you keep your chain clean and lubed and replace it before it 'stretches' too much, your expensive drive train parts will last longer.

http://www.sheldonbrown.com/chains.html

Posted on Mar 25, 2011

  • c_rubie Mar 25, 2011

    Yes, the outer ring is the most worn. I've tried to dismantle to see whether separate rings can be removed, but apart from the outer plastic guard, the 3 rings are all moulded/welded as one. The instructions you've linked in are pretty much what I've been trying, so I'll have another attempt with renewed confidence that I'm not missing anything.
    If no joy, I can only assume the crank has somehow "seixzed" to the bracket in the 2 years its been on and seek expert removal?

  • David Dunn
    David Dunn Mar 25, 2011

    The cheaper cranks ARE all one piece because they don't expect the rider to put on the miles or the bike to outlive your enthusiasm for it.

    You would be better off to buy a quality crankset and bottom bracket if necessary (they wear out, too). A Bicycle Shop could hook you up. There are several dimensions that need to be considered for proper chainline and fit.

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