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  1. #1
    mtbr member
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    Cassettes and Chain Length

    I'm thinking of going to a 12-36 from a 11-32 rear cassette. I know this may sound a little redundant,but will I need a longer chain? If so,by how much? Thanks for any and all comments.

  2. #2
    Mountain Man Dan
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    It depends... You're adding one tooth. Adding one link equals two teeth. Also depends how much slack you have now.

  3. #3
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    I know I'm lousy at math and I know your going to get into gear ratio's but,how does going from a 11-32 to a 12-36 only add one tooth?

  4. #4
    Mountain Man Dan
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    Well, I Googled the question............ Google is your friend.

  5. #5
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    The difference is 4 teeth. I wouldn't worry about it, as long as you don't use any stupid gear combos you'll be fine.

  6. #6
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    Nah, no crazy combo's,just changing cassette's and probably a new chain.Will the derailleurs need to be readjusted for the new 12-36?

  7. #7
    Mountain Man Dan
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    You could always do the big ring, big cog combo to get the correct chain length.

  8. #8
    wyrd bi ful rd
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    Keep your current chain, unless you will use the large chainring with the largest cog of your new cassette. I think the next size down will be a 32T ... so you can still effectively use that cog with the largest chainring, but will you???

    Actually on that note, I have never gone to the 3rd largest cog with the largest chainring in front before ... and I used the chain length measurement below ... with the 2 extra links ...

    Just tried largest chainring & cog and the derailleur looks quite stretched to me ... not something that I would use as I am sure I can get approximately that ratio elsewhere ...

    Derailleur adjustment ... not sure about SRAM, but with shimano ...
    20070624 chain tensioner B MTBR FORUM.jpg

    Chain length if you decide to change is ...
    20070624 chain length MTBR FORUM.jpg
    Last edited by chinaman; 06-29-2011 at 06:54 AM.

  9. #9
    www.derbyrims.com
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    ... and measure a full suspension for chain length at bottom out (shock disconnected or completely deflated). Because almost all suspension bikes "grow" in distance between the rings and cogs while compressing deeper into travel.

  10. #10
    Dirty nerotic bike whore
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    Keep this in mind, any time you repace a cassete or front chain rings its always with a bran spankin new chain. This does not apply to cassette and chain rings when replacing the chain but well you get the idea.

  11. #11
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    ... and if we just ...

    Thank you to all for your suggestions. I replaced cassette and chain without a hitch! And the bigger gear works great when climbing!

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