Axle minimum insertion in a horizontal dropout?- Mtbr.com
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  1. #1
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    Axle minimum insertion in a horizontal dropout?

    When dealing with a bike with horizontal dropouts, is there an axle position in the dropout where things begin to become ill advised and/or dangerous?

    I'm setting up my Ogre with the option to be a singlespeed but due to the tire size, I have to lengthen the chain and pull the wheel almost the to the end of the dropout to eliminate rubbing. From the outside edge of the axle to the opening of the dropout, my calipers read 3mm. I don't quite have the correct chain tension (too loose) so that number will get smaller.

    Thanks!
    Ventana El Rey - 3x9
    Schwinn High Plains w/ drop bars - 3x8
    Surly Ogre - Alfine 8/SS

  2. #2
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    I would worry about it because you're not getting much clamping force from the lockdown nuts. Does adding one chain link really cause tire rubbing up front? A different gear setup you could use that would allow you to move it back into the dropouts a little further?
    "a hundred travel books isn't worth one real trip"

  3. #3
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    Some pics below so better show what I'm dealing with. You see an IGH hub but the principle is the same as SS and the front wheel is actually a singlespeed hub (so I have a backup drivetrain).

    I added 2 links of chain to pull the tire back to the "sweet spot" of the rear triangle. With the chain shorter, the very outside nubs of the tire rubbed on the chainstays. Trimming the nubs down with a razor blade would probably solve problem; I just hate taking a knife to new rubber and the nubs are not that tall to start with.

    Axle minimum insertion in a horizontal dropout?-20160412_145123.jpgAxle minimum insertion in a horizontal dropout?-20160412_145145.jpg

    I suppose another option would be to use a half-link.
    Ventana El Rey - 3x9
    Schwinn High Plains w/ drop bars - 3x8
    Surly Ogre - Alfine 8/SS

  4. #4
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    Based on your picture and type of lock nuts, I'd be OK riding as is, but once you need to add any tension to the chain, I'd question it. Do you have any other chainrings one tooth smaller or cogs one tooth larger you can try?

    Will this also be an issue with the front tire?
    "a hundred travel books isn't worth one real trip"

  5. #5
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    Looks fine but you will run out of room as the chain wears in. Would try adding a half length to give you more adjustment options.
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  6. #6
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    Since you are running gears, I would not worry since you won't be laying down any serious torque like on a real bike. I meant single speed. Seriously though, I would just try it. If it doesn't work, you do have that front hub.
    Vassago Cycles, Shadetree Bikes, Flat Tire Bikes, Galfer Brakes USA

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