Building Single Speed with Horizontal Dropout- Mtbr.com
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  1. #1
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    Building Single Speed with Horizontal Dropout

    I have a horizontal dropout that I want to make single speed. I am trying to avoid using a chain tensioner. I found a gear ratio very close to perfect and according to eehouse (great ss calculator) it is the closest I will get. I know about half links, eno hubs, and every other way to make it closer to fitting perfect. I don't want to pay for eno hub and I have seen a few forums that said you can file the axle or dropout. I think this will work but not exactly sure how to file it. Can someone please write a detailed description on how to do this or link me to a page that will allow it. Thanks.

    Also I would rather file the axel not the dropout because I can get a new axle but not a new bike but if filing the dropout is more ideal than I can do that as well.

  2. #2
    Downcountry AF
    Reputation: *OneSpeed*'s Avatar
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    with a proper hub you should not have to file anything. just get a bolt on hub from Surly or Hope, or even a QR hub with tug nuts would work just fine. example: i recently purchased a Surly Krampus that has horizontal drops. it came with a standard Shimano QR. no problem so far.
    Rigid SS 29er
    SS 29+
    Fat Lefty
    SS cyclocross
    Full Sus 29er (Yuck)

    Stop asking how much it weighs and just go ride it.

  3. #3
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    The whole point of horizontal drop outs is that they should work with single speed. Sure you're not thinking of vertical drop outs?

  4. #4
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    read this and then re-think what you are asking- Singlespeed Bicycle Conversions

  5. #5
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    Sorry I am an Idiot I meant vertical dropout. I had horizontal dropouts on my mind and typed that

  6. #6
    Downcountry AF
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    still no need to file anything. get yourself a tensioner, that's what they're designed to do. if you really can't stand the thought of one for some odd reason, get yourself a SS frame.

    the perfect gear will only last as long as your chain doesn't stretch, which for me is exactly 1/2 of the first ride on a new chain. so you will have wasted a lot of time and energy for a setup that is unlikely to work long term.
    Rigid SS 29er
    SS 29+
    Fat Lefty
    SS cyclocross
    Full Sus 29er (Yuck)

    Stop asking how much it weighs and just go ride it.

  7. #7
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    if you don't like the look and feel of a hanger-mounted tensioner, look into a Blackspire Stinger.

  8. #8
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    Magic Ratio is the answer, and usually possible without mutilating the bike.

    It just requires the right combination of cogs and chainwheel.

    There's nothing wrong with running a singlespeed chain a bit slack, provided you are using:
    1. singlespeed chainrings and cogs with taller teeth than derailleur gears. (Derailleur gears are designed to allow the chain to slip off easily - a bad thing for SS)
    2. singlespeed chain (Derailleur chains are designed to flex sideways easily to slip off the cogs - again a bad thing for an SS)
    3. straight chainline

    Sometimes if you are close to getting it to fit, using a slightly worn chain will do the job.

    However, it really is much simpler to just get a singlespeed frame - eBay your old one and put that towards a proper SS frame. Good frames can be bought new relatively cheap from On-One or Surly, so secondhand they are a screaming bargain.
    As little bike as possible, as silent as possible.
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