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  1. #1
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    Convert road bike to fixed gear

    Waiting for my ebay cassette to arrive and thinking about going single speed on my trek road bike. do i need a tensioner? the lbs guy said i do but i am looking at these fixed gear conversion bikes and they don't have one. I also have a derailleur but the cassette won't come in for another week and that is the only part holding me up.

  2. #2
    Spelling Snob Hobartlemagne's Avatar
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    Fixed gear bikes dont need tensioners. Some singlespeeds have them, but not all of them.

    The first rule of flats is You don't talk about flats!

  3. #3
    Senior Member Retro Grouch's Avatar
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    Any single speed or fixed gear bike has to have a way to adjust the chain tension.

    On a bike with a single speed freewheel this can be done with either horizontal frame dropouts or with a spring loaded chain tensioner that works like the arm on a derailleur.

    On a fixed gear you have to be able to put pressure on the pedals in either direction so a spring loaded tensioner arm won't work. If your bike frame has vertical dropouts options include using a rear hub that has an eccentric built into it or finding a fortuitous chainring and sprocket combination that keeps the chain snug.

  4. #4
    Your mom
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    If it's a newer Trek, it has vertical dropouts, and cannot be single speed without a tensioner. Check out Sheldon:

    http://sheldonbrown.com/singlespeed.html

  5. #5
    Senior Member barba's Avatar
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    You can't use a chain tensioner with a fixed gear, as RG notes.

    More information on your bike would be useful.

  6. #6
    Your mom
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    Oh yeah, your header says fixed, but your post says SS. Which are you looking for?

    Either way, it will be work or $$.

    Fixed: new rear wheel.

    SS: cassette and spacers with one cog.

    If you like gears, just wait for the cassette.

  7. #7
    hello roadfix's Avatar
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    Just be patient and wait for your cassette. Do a SS conversion on a spare bike instead.

  8. #8
    cab horn
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    1) You will need a tensioner with vertical dropouts
    2) Single speed kits with spacers and a cog are cheap
    Mes compaingnons cui j'amoie et cui j'aim,... Me di, chanson.

  9. #9
    hobby alchemist j-lip's Avatar
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    This is risky, but if you have vertical dropouts and you get lucky and are really close to your desired chain tension, but not quite there, a file can be used on the axle or the frame. But, I'm talking about very small amount of filing. I was successful using this method on a single speed mountain bike of mine. It's an aluminum trek frame that I ride a lot with no problemos. Let me emphasize risky.

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