Changing cog, shorten chain or rotate EBB?- Mtbr.com
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  1. #1
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    Changing cog, shorten chain or rotate EBB?

    As the title says, just ordered a couple of new cogs (16t & 14t), for my GT Peace.

    Not sure what to do about fitting them though.
    Should I shorten the chain or is it an option to rotate the EBB to compensate?

    The old cog is an 18t btw.

  2. #2
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    Quote Originally Posted by RichyX
    As the title says, just ordered a couple of new cogs (16t & 14t), for my GT Peace.

    Not sure what to do about fitting them though.
    Should I shorten the chain or is it an option to rotate the EBB to compensate?

    The old cog is an 18t btw.
    (general answer for most EBB's)

    For the 14T you'll have to shorten the chain unless the EBB is all the way back.
    For the 16T shorten the chain if the EBB is half-way forward.

  3. #3
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    If it is all the way back right now, you might be able to rotate the EBB enough. It isn't a big deal to pull a link out either. Base it on where you want your EBB positioned.

  4. #4
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    Thanks for the replies.

    The EBB is currently approx. half way round.

    I'll probably have the 14t on the bike most often, so how many links will I need to remove?

    How do SS riders handle swapping cogs a lot? Keep a few different chains?

  5. #5
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    Use chain connectors

    I am using a SRAM 9spd chain with the gold connector. I sized the chain for the smallest cog then add links and gold connectors if needed for larger cogs if the EBB does not take up the slack.
    I ride at ludicrous speed

  6. #6
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    I have two chains that I interchange depending on my front ring/rear freewheel combination. One chain is sized to fit a 34x16 and 34x17 configuration. And the other chain is sized to fit a 32x16 and 32x17 and possibly a 32x18 which I rarely use. That is what I love about the EBB.
    "The most important thing about this instrument is the way the air smells when it comes out of these holes" ~Frank Zappa

  7. #7
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    Quote Originally Posted by RichyX
    Thanks for the replies.

    The EBB is currently approx. half way round.

    I'll probably have the 14t on the bike most often, so how many links will I need to remove?

    How do SS riders handle swapping cogs a lot? Keep a few different chains?
    1 link = 4 teeth

    I keep different chains. It's just simpler and easier than re-sizing a chain.

  8. #8
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    Quote Originally Posted by pacman
    1 link = 4 teeth

    I keep different chains. It's just simpler and easier than re-sizing a chain.
    That's straightforward enough.

    What if I want to use the 12t with my current chain?
    Would removing 1 link + rotating the EBB 1/4 be enough?

  9. #9
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    Quote Originally Posted by RichyX
    That's straightforward enough.

    What if I want to use the 12t with my current chain?
    Would removing 1 link + rotating the EBB 1/4 be enough?
    If there's enough space left to rotate the EBB. 2 teeth requre 1/2 the maximum adjustment ot the EBB.

  10. #10
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    I had thought going from 18t to 14t would involve the removal of 2 links.
    One link takes up 2 teeth when on the cog doesn't it?

  11. #11
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    Quote Originally Posted by RichyX
    I had thought going from 18t to 14t would involve the removal of 2 links.
    One link takes up 2 teeth when on the cog doesn't it?
    you are correct.
    one link is an innie and an outtie, 2 teeth.
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  12. #12
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    Quote Originally Posted by nogearshere
    you are correct.
    one link is an innie and an outtie, 2 teeth.
    Ok, so I'll need to remove 2 full links to drop down from 18t to 14t then.

    That makes it a bit more simple for using the 16t and 12t I also bought.

  13. #13
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    Quote Originally Posted by RichyX
    I had thought going from 18t to 14t would involve the removal of 2 links.
    One link takes up 2 teeth when on the cog doesn't it?
    But the chain only goes (about) halfway around the chainring. As far as the chain is concerned you are going from 9T to 7T.

  14. #14
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    Quote Originally Posted by pacman
    But the chain only goes (about) halfway around the chainring. As far as the chain is concerned you are going from 9T to 7T.
    I realised that last night while lying in bed!

    So how can I adjust for use of a 16t?
    Can't remove half a link, and I only have around 1/4 of a rotation of the EBB to use.

    Back home I have an old chain tensioner that hangs from the chainstay. It's been used on geared bikes but maybe it can help on an SS...

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