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FG cog, no lockring on an old freewheel hub

Singlespeed & Fixed Gear "I still feel that variable gears are only for people over forty-five. Isn't it better to triumph by the strength of your muscles than by the artifice of a derailer? We are getting soft...As for me, give me a fixed gear!"-- Henri Desgrange (31 January 1865 - 16 August 1940)

FG cog, no lockring on an old freewheel hub

Old 04-04-06, 08:34 AM
  #1  
MrCjolsen
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FG cog, no lockring on an old freewheel hub

I know it's cheap. I know that the cog can unscrew from the hub (it did once. I stopped by using these things left on my bike from the last person who had it. Back in the day I think they called them "brakes.")

But seriously. I put the setup on my normally singlespeed conversion and rode it around the block a few times fixed. I had not ridden a fixed gear bike since 1968. It seemed fun, so I now I'm rebuilding the wheel. When I got the bike (free from a person who had it hanging in their garage for 15 years) it had a bent back wheel and a good front wheel. I had an extra wheelset, so I made a cassette singlespeed and put the wheels on the bike. To make it fixed gear, I'm taking the good front rim and building it onto the old freewheel hub.

When I first screwed the cog onto the wheel, and rode it I attempted to stop using my pedals. The cog started to unscrew. I screwed it back on, rode a bit more and gave it as much torque as I could while riding. The cog stayed put the next few times I tried stopping. So far so good.

So if I'm keeping the brakes on the bike (I'm cheap, but not crazy) is there a big problem with using the old threaded hub when I want to ride fixed (I'll still have the wheel with the cassette hub when I want singlespeed).

And finally, should I use locktite when I screw the cog on. If I do, will I ever get it off?
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Old 04-04-06, 08:47 AM
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gorn
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Loctite wouldn't hurt. Also search for rotafix. And you can use an old english threaded BB lockring to help a bit too. Definitely keep the brakes.
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Old 04-04-06, 09:01 AM
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You can also use this. http://204.73.203.34/fisso/eng/schpignone.htm Oh, and yes, you will be fine if you keep your brakes on.
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Old 04-04-06, 09:09 AM
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Originally Posted by Cynikal
You can also use this. http://204.73.203.34/fisso/eng/schpignone.htm Oh, and yes, you will be fine if you keep your brakes on.
you cant really do that on a conversion though
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Old 04-04-06, 09:17 AM
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Originally Posted by jandops
you cant really do that on a conversion though
Yes you can (I've done it)
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Old 04-04-06, 09:22 AM
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so, some people are gonna tell you to search, and other people are gonna tell you you're gonna die.

anyway, there are some inherent risks to not using a reverse-threaded lockring, namely, the risk of unthreading the cog while riding, due to exertion of backpressure. that risk is mitigated by some other factors--the ritafixation, use of a bottom bracket lockring on top of the cog, use of red loctite, use of handbrakes.

weigh your risks and needs, and move forward accordingly.
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Old 04-04-06, 09:30 AM
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Keep brakes, use loctite, use wheel to tighten as much as possible.

Queerpunk!- ritafixation? What's that?

If you get it really tight, with loctite it shouldn't come loose very easily. The problem is sometimes, under extreme duress it will. You don't hear about it much, but then you don't hear much from guys that try to skid stop hard going down big hills on brakeless bikes and have their rotafixed cogs come loose.

Nothing at all ever really. ever.
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Old 04-04-06, 09:30 AM
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If you're already rebuilding the wheel, why not just buy a cheap track hub? I think nashbar sells the formula (possibly rebadged) ones for pretty cheap. Seriously, I ran a bumbike setup (loctite and BB lockring) for over five months and never had a problem with it coming loose, even when skipping and skidding all the time, but that said, I also ran it that way because I didn't want to buy/ build up a new wheelset. If you are already going to all the trouble why not pick up a cheap hub and do it the right way?
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Old 04-04-06, 09:33 AM
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oops. rotafixation. http://204.73.203.34/fisso/eng/schpignone.htm as linked above.
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Old 04-04-06, 11:02 AM
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Keep brakes, use loctite, use wheel to tighten as much as possible.

Queerpunk!- ritafixation? What's that?

If you get it really tight, with loctite it shouldn't come loose very easily. The problem is sometimes, under extreme duress it will. You don't hear about it much, but then you don't hear much from guys that try to skid stop hard going down big hills on brakeless bikes and have their rotafixed cogs come loose.

Nothing at all ever really. ever.
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Old 04-04-06, 11:14 AM
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If you were riding bikes back in '68 that makes you old enough to know better...a freewheel hub with fixed cog, loctite, well-secured is very unlikely to unscrew while riding, especially if you use handbrakes. A decent-quality proper track hub with a lockring properly installed is just shy of absolutely never going to unscrew. The difference between a 5% chance of tossing my chain and risking great bodily injury and 1% chance of same is certainly worth $20 bucks to me. It's also much easier to change gearing or replace broken spokes.
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