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REAR TRACK HUB QUESTION???????(4 posts)

REAR TRACK HUB QUESTION???????alexfr99
Aug 21, 2001 6:32 PM
Is the rear sprocket (threaded onto a rear track hub) supposed to unthread when one back pedals? If not (and it seems awkward) how does one prevent the unthreading? I purchased a used fixed gear bike and perhaps its missing a lockring or something???? Please advise........thanks
re: REAR TRACK HUB QUESTION???????Atombomber
Aug 21, 2001 7:02 PM
There should be a lock ring.

BTW, are you going to ride in reverse? Let me call PT Barnum, they might need you.
re: REAR TRACK HUB QUESTION???????tommyb
Aug 22, 2001 3:52 AM
If it's a real track hub, then there should be a lockring that is left-hand threaded. It has a slightly smaller diameter than the cog threading, and since it's left threaded, it will tighten as the cog tries to unscrew.

If it's not a real track hub, but an old-style freewheel hub, you should use an old bottom bracket lockring (same diameter and pitch as a freewheel) as a lockring. Since this screws on in the same direction as the cog, it is still prone to unscrew as you apply reverse torque on the cog, if it's not tight enough. I use a little bit of Loctite for a bit more security. Periodically check the tightness of the cog and lockring. I've had one unscrew once, and it scared the bejeezus out of me.

Check out http://www.sheldonbrown.com/fixeda.html for everything you ever wanted to know about fixed gear. It's an awesome part of cycling.
re: REAR TRACK HUB QUESTION???????alexfr99
Aug 22, 2001 5:48 AM
Thanks Tommy...I appreciate your advise and the link.