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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 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.