single speed conversion
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  1. #1
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    single speed conversion

    I need to get educated on this subject

    So I can buy a single speed conversion kit that fits on the 8/9/10 speed freehub on the rear wheel, use the spacer for chainline and pick a cog for gear ratio, I get that part.

    What about the rest of it, how do you size the chain, adjust slack etc

    P.S. I have seen those dolly wheels that clamps on the chainstay, but not sure how I feel about doing that on a carbon frame.


    THanks

  2. #2
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    Most versions of those tensioners (that's what the "dolly wheel" thing is called) attach to the derailleur hanger, so no worries about your frame.

    Here's some reading for you:
    Singlespeed Bicycle Conversions
    "None of us knows for sure what's out there; that's why we keep looking. Keep your faith; travel hopefully. The universe will surprise you, constantly." The 13th Doctor.

  3. #3
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    Thanks JCavilla, I have been to sheldon's page and that's where I saw the clamp style tensioner. I have seen a member's bike does not have any tensioners but obviously was not a single speed bike I think unless it was a track bicycle.. how was that done?

    Should the bottom bracket cups be flush to the frame?

    Does anyone have recommendation for the best parts to use?

  4. #4
    'brifter' is f'ing stupid
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    if it was a 'track' frame or a frame specifically made to be a single speed it has horizontal dropouts so you can adjust chain tension.
    there are many chain tensioners available that bolt to the derailleur hanger just like a derailleur would.
    #promechaniclife

  5. #5
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    Quote Originally Posted by cxwrench View Post
    if it was a 'track' frame or a frame specifically made to be a single speed it has horizontal dropouts so you can adjust chain tension.
    there are many chain tensioners available that bolt to the derailleur hanger just like a derailleur would.
    Or an older road frame with horizontal dropouts. My fixies are built on garage-sale frames.

    And even with vertical dropouts you can get adequate chain tension without a tensioner with some combination of a magic gear and/or half-link. And of course the elegant but expensive Eno hub, but it sounds like you're preferring to do it on the cheap (which is the way I like to go, too ;-)

    Sheldon covers all of this in his articles on fixed-gear and single-speed conversions.
    "None of us knows for sure what's out there; that's why we keep looking. Keep your faith; travel hopefully. The universe will surprise you, constantly." The 13th Doctor.

  6. #6
    cs1
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    Quote Originally Posted by JCavilia View Post
    it sounds like you're preferring to do it on the cheap (which is the way I like to go, too ;-)
    Without hacksawing them off what is the cheap way to cover up Down Tube shifter bosses?
    1995 Waterford 1200
    1999 Waterford RSE-11
    Plus a host of old bikes too many to list.

  7. #7
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    Umm . . , duct tape? I don't really know. Problem Solvers makes some pretty metal covers, but they're 15 or 20 bucks, so maybe that's not cheap enough for you. I'd think a creative person could improvise something from various materials. Sculpey? You could make little faces on them.

    Thing is, if you cover them there's still a bump there, just a different bump, so you lose some of the clean simple look. If there's a chance you might reverse the conversion, that would be a reason to cover them, but otherwise . . .

    I went the hacksaw and file route. Looks pretty good to my eye, and there's nothing for my knee to bump into when I'm thrashing up a hill.
    "None of us knows for sure what's out there; that's why we keep looking. Keep your faith; travel hopefully. The universe will surprise you, constantly." The 13th Doctor.

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