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  1. #1
    Yup pyze-guy's Avatar
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    Poad casette on mtb

    I switched 8 speed casettes from mtb to road. It is a mtb and haven't changed the chainring size. Both casettes start at 12 teeth. Question I have is should the chain be shortened at all?
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  2. #2
    Senior Member
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    Only if the big cog is much smaller. Check by putting chain on big ring and big cog (cross-chain), and see how much slack there is.

  3. #3
    Yup pyze-guy's Avatar
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    Quote Originally Posted by AndrewP View Post
    Only if the big cog is much smaller. Check by putting chain on big ring and big cog (cross-chain), and see how much slack there is.
    Cool. They are different sizes. Any rule of thumb to how many links to remove? Does it go by tooth difference or is it an eyeball it type of thing?
    When sadness fills my days
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  4. #4
    Older than dirt CCrew's Avatar
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    Quote Originally Posted by pyze-guy View Post
    Cool. They are different sizes. Any rule of thumb to how many links to remove? Does it go by tooth difference or is it an eyeball it type of thing?

    General rule of thumb is loop big ring front, big ring rear, and add 2 links.

  5. #5
    GO BIG RED norwood's Avatar
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    On my B'stone MB-3, I have a wheelset for road with a 12-23 and a mountain wheelset with a 13-30 cassette and interchange between the two with no ill effects chainwise.
    1996 Bianchi Veloce
    1993 Bridgestone MB-3
    1992 Trek 700
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