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Old 06-26-07, 08:54 PM   #1
cradduck
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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?
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Old 06-26-07, 09:29 PM   #2
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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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Old 06-26-07, 10:46 PM   #3
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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
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Old 06-27-07, 01:11 AM   #4
cradduck
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Is the special tool for removing the freewheel something most bike shops would have?
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Old 06-27-07, 05:51 AM   #5
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yes of course
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Old 06-27-07, 09:18 AM   #6
Sheldon Brown
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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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Old 06-27-07, 09:35 AM   #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
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Old 06-27-07, 10:36 AM   #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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