How much slack will a Rennen take up?- Mtbr.com
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  1. #1
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    How much slack will a Rennen take up?

    I'm speccing the stuff I need to make a vertical dropout Dean to run s/s. The FixMeUp website says the closest I can get to my correct gear inches is a 36x15, but this will need a chainstay 0.05 of an inch longer than the 17.5 that I have.

    Will a Rennen take up this slack, and more when the chain begins to stretch? 44x17 is perfect for this chainstay but the gear inches are a bit long and I don't want to go this big.

  2. #2
    Back of the pack fat guy
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    Rennen

    Quote Originally Posted by Serious Humour
    I'm speccing the stuff I need to make a vertical dropout Dean to run s/s. The FixMeUp website says the closest I can get to my correct gear inches is a 36x15, but this will need a chainstay 0.05 of an inch longer than the 17.5 that I have.

    Will a Rennen take up this slack, and more when the chain begins to stretch? 44x17 is perfect for this chainstay but the gear inches are a bit long and I don't want to go this big.
    I think the Rennen is your answer. I tried a singleator, and when that didn't work, I converted to a Rennen, which is a much better design - no spring to break. It also comes with a half-link, which helps a lot in getting your chain the right length. I'm actually planning on selling my barely-used Rollenlager (have since bought a 1x1 frame), so PM me if you're interested in it.

  3. #3
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    My question is - will a Rennen make up for this much over-length chainstay? Presumably it has a limited capacity to take up chain.

  4. #4
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    You can run any gear that you want with the rennen. You may have to use the half link though. If you use a half link, then you can get to within 1/2" of the proper chain length. The rennen will take up the rest.

  5. #5
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    Caution!

    I use a Rollenlagger and love it, but the roller is fairly wide. It can not be pushed up as far as an old-style Singulator. This can be a problem if you have wide chainstays.

    I have fairly wide titanium chainstays, and the Rollenlagger bumps into them before I can take up all the slack for some chainring/cog combinations.

    The half-link is a great help. Alas, mine fell apart a few weeks ago.

    Good Luck,

    Joe

  6. #6
    And He was Not
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    Mine bumped the stay in the up mode, but it works fine in the down mode. Been very happy with it.

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