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  1. #1
    This town needs an enema.
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    6 to 1 speed question

    A friend is looking at setting up a single speed on the cheap.

    I took the six speed cassette of the wheel and it looks like it has a freehub design but one I haven't seen before. The largest three sprockets slide on to a larger diameter portion of th freehub and the next smaller two slide onto a smaller diameter portion of the freehub. The smallest (13t) then threads on to fix everything in place. Is is possible to convert this to a single speed and acheive a straight chainline?
    ^this may or may not be useful information <--this not so much.

  2. #2
    Gone, but not forgotten Sheldon Brown's Avatar
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    Quote Originally Posted by cradduck
    A friend is looking at setting up a single speed on the cheap.

    I took the six speed cassette of the wheel and it looks like it has a freehub design but one I haven't seen before. The largest three sprockets slide on to a larger diameter portion of th freehub and the next smaller two slide onto a smaller diameter portion of the freehub. The smallest (13t) then threads on to fix everything in place. Is is possible to convert this to a single speed and acheive a straight chainline?
    That's not a cassette, not a Freehub. It's an old style thread-on freewheel. You can unscrew the whole freewheel (with a special tool) and replace it with a single-speed freewheel or fixed gear sprocket. You will need to re-arrange spacers to correct the chainline, then re-dish the wheel to bring it back to the center of the frame.

    See: http://sheldonbrown.com/freewheels

    and: http://sheldonbrown.com/fixed-conversions

    and: http://sheldonbrown.com/singlespeed

    Sheldon "It's Doable" Brown
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  3. #3
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    Quote Originally Posted by Sheldon Brown
    or fixed gear sprocket.
    Isn't that called a suicide hub then?

    I've done what Sheldon said, took me about 3 hours

  4. #4
    This town needs an enema.
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    Is the special tool for removing the freewheel something most bike shops would have?
    ^this may or may not be useful information <--this not so much.

  5. #5
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    yes of course

  6. #6
    Gone, but not forgotten Sheldon Brown's Avatar
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    Quote Originally Posted by Daijoubu
    Isn't that called a suicide hub then?

    I've done what Sheldon said, took me about 3 hours
    Yes, but that's a stupid designation.

    It's just as safe as a freewheel, as long as you have two brakes.

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  7. #7
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    It's only a "suicide hub" if you use it as a fixed gear. There's no issue at all if you use it with a single cog freewheel. As Sheldon said, there's really no problem using that kind of hub if you use brakes, and you need brakes no matter what kind of hub you use. It ironic thing is that it's mostly the guys who don't use brakes object to "suicide hubs."

    em

  8. #8
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    Quote Originally Posted by cradduck
    A friend is looking at setting up a single speed on the cheap.

    I took the six speed cassette of the wheel and it looks like it has a freehub design but one I haven't seen before. The largest three sprockets slide on to a larger diameter portion of th freehub and the next smaller two slide onto a smaller diameter portion of the freehub. The smallest (13t) then threads on to fix everything in place. Is is possible to convert this to a single speed and acheive a straight chainline?
    It's a freewheel. You can replace it by a single-speed freewheel, or modify it. Sometimes the middle gears are threaded on rather than slipped on, so you can pile up spacers to get the right chainline, and thread the cog you want in place.

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