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Thread: FG Cog Question

  1. #1
    *meow* Azul the Cat's Avatar
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    FG Cog Question

    I am currently running a BMX style freewheel on the stock rear wheel. I am interested in going fixed, but I don't want to spend a lot of money on a new track frame. What kind of options do I have for threading a cog onto the stock hub? I have seen products like this \/\/\/

    Is this a viable option? Or am I really off base here. I know I would need to space it out to have a good chain line.
    ...blades don't need reloading.

  2. #2
    Perineal Pressurized dobber's Avatar
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    You'll have issues with the chainline



    You can't just "space it out". And you'll have no proper lockring.

    Suggest you get a purpose built wheel.

    And read up about Fixed Gear at Sheldons site.
    This is Africa, 1943. War spits out its violence overhead and the sandy graveyard swallows it up. Her name is King Nine, B-25, medium bomber, Twelfth Air Force. On a hot, still morning she took off from Tunisia to bomb the southern tip of Italy. An errant piece of flak tore a hole in a wing tank and, like a wounded bird, this is where she landed, not to return on this day, or any other day.

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    Senior Member joetronic's Avatar
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    Do a search for "suicide hub" and "rotafix"

    You'll get mixed opinions on this subject. So much that I wouldn't suggest it, but in person, and not here, I would. So would many others.

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    *meow* Azul the Cat's Avatar
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    Quote Originally Posted by dobber View Post
    Suggest you get a purpose built wheel.
    Whats out there for a purpose built wheel?
    ...blades don't need reloading.

  5. #5
    some new kind of kick Suttree's Avatar
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    Quote Originally Posted by Azul the Cat View Post
    Whats out there for a purpose built wheel?
    lots of fixed wheel sets around-- SOMA has one,
    do a little googling. What you will get for anything
    less than a good chunk of change is a formula hub
    or something comparable, probably rebranded by whoever
    is selling them, laced to decent but not great rims

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    *meow* Azul the Cat's Avatar
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    nvm
    Last edited by Azul the Cat; 09-02-08 at 04:51 AM.
    ...blades don't need reloading.

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    Quote Originally Posted by joetronic View Post
    Do a search for "suicide hub" and "rotafix"

    You'll get mixed opinions on this subject. So much that I wouldn't suggest it, but in person, and not here, I would. So would many others.
    There is no mixed opinion. Its not called suicide hub because it's safe. Especially if you don't run any brakes.
    Mes compaingnons cui j'amoie et cui j'aim,... Me di, chanson.

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    Aphoticism.
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    Quote Originally Posted by operator View Post
    There is no mixed opinion. Its not called suicide hub because it's safe. Especially if you don't run any brakes.

    If you make sure that cog is on there using automotive engine grade locktite, you'll be okay. Once you thread the cog on and use the appropriate adhesive let it dry, and then use a bottom bracket lock ring as another form of "insurance" it'll be bomb proof.

    Using a free wheel type of hub is okay for fixed gear, you just need to know how to make it so things won't come apart on you. I know plenty of old timers who did just that for years.

  9. #9
    yo yo yo yo yo
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    Quote Originally Posted by operator View Post
    There is no mixed opinion. Its not called suicide hub because it's safe. Especially if you don't run any brakes.
    it's perfectly fine if you use brakes (ie NO back pressure)
    Quote Originally Posted by tx_what_it_do View Post
    machined are for brakes. non-machined are more for brakeless.

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    Team Beer Cynikal's Avatar
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    Just get a cog that has the same number of teeth as your freewheel and thread it on. A track hub has a smaller set of reverse threads to hold a lockring. The lock ring keeps your cog from spinning off when you apply back-pressure.

    If you just want to try fixed, just pull off your freewheel and thread on a cog. Just keep on your brakes.
    I'm not one for fawning over bicycles, but I do believe that our bikes communicate with us, and what this bike is saying is, "You're an idiot." BikeSnobNYC

  11. #11
    CrossFixed
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    Is your bike by any chance disc brake compatible?
    Because if you have a disc mounting bracket on your rear hub, you can bolt a fixed cog onto it, and then you don't have to worry about lockrings, loctite, suicide hubs, etc.

    If you can find one that has that option, pick it up.
    REDLINE makes freewheel single speed hubs that are disc compatible, and http://www.londonfixiebike.co.uk/ sells some pre-drilled and super sweet cogs.
    Or you can just get a cheap one and drill it yourself.
    I'd recommend 16 teeth or more, as the smaller ones don't have the surface area for drilling.

  12. #12
    Bicycle Repair Man !!! Sixty Fiver's Avatar
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    Quote Originally Posted by operator View Post
    There is no mixed opinion. Its not called suicide hub because it's safe. Especially if you don't run any brakes.
    I suspect that opinions are mixed on this ...

    I have a suicide hub on two of my conversions (and one of those is a flip flop), built a fixed wheel set for my touring bike, and my vintage road bike came with a fixed hub.

    A suicide hub is okay of you build it up right and use a brake...to many people fail at the building it right and running a brake part which is suicidal.

    Running a purpose built wheel is the best way to go.

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