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Old 02-23-11, 09:48 AM   #1
mrkano
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Lock ring for fixed cog not screwing on

Hi.

I have stuck a fixed cog on my old 70s hub off an Ernie Clements falcon.

I tried to stick the lock ring on but it doesn't seem to be able to get enough thread??

I tried the old pedal up a hill method to screw it on and actually snapped my right hand crank arm!

(was an old vintage alloy though)

Any ideas??

Also, the alignment is way off... the fixed cog and chain ring are on a bit of an angle...??

Any ideas??
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Old 02-23-11, 10:36 AM   #2
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A true track hub has right hand threads for the cog and left hand threads for the lockring that keeps it in place.

If you are using a road hub then you most likely do not have the left hand threads and maybe trying to screw a lefthand threaded lockring onto the right hand threads.

To correct for chainline you can put a spacer behind the cog.

Also a shoddy substitute for a track lockring is to find a steel bottom bracket lockring and use that as it will be righthand threaded.

-j
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Old 02-23-11, 03:16 PM   #3
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If you are using a road hub then you most likely do not have the left hand threads and maybe trying to screw a lefthand threaded lockring onto the right hand threads.
-j
That's not possible given that that 'track' lockrings are a smaller diameter than any fixed cog.
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Old 02-23-11, 03:51 PM   #4
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Track lockrings also come in several different diameters and threadings. Those by French, Italian, and Japanese companies usually don't fit hubs from other nations' companies.
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Old 02-23-11, 05:09 PM   #5
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Track lockrings also come in several different diameters and threadings. Those by French, Italian, and Japanese companies usually don't fit hubs from other nations' companies.
+100, Mixing lockrings is a common error. Even different brand lockrings from the same country can vary. Make sure the lockring is a good snug fit on your hub because you'll be putting significant torque onto something only 2-3 threads wide. Over the years I've seen way too many track wheels destroyed because of stripped lockring threads.
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Old 02-28-11, 05:40 AM   #6
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Still a little stuck on this one???

What are my options???

Apart from buying a new wheel???
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Old 02-28-11, 07:13 AM   #7
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Still a little stuck on this one???

What are my options???

Apart from buying a new wheel???
No one knows because you haven't described what you actually have for a rear hub and a lock ring. Is the hub intended for a fixed cog? If it is, it will have a stepped thread where the larger inner part is right-hand threaded for the cog (tightens clockwise) and a the smaller outer part is left-hand threaded (tightens counter-clockwise). Then you need to make sure that you have the proper lock ring diameter to match the hub, as cal_gundert05 pointed out.
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Old 02-28-11, 07:43 AM   #8
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Sorry yeah it's an old 70s wheel I think, so not intended for a lock ring with the lock thread...

Any option around this??
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Old 02-28-11, 09:16 AM   #9
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Get a new wheel. You're lucky the cog didn't come off while riding.
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Old 02-28-11, 10:05 AM   #10
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Thinking I will buy a freewheel cassette instead of a fixed cog.

Will solve my problem, in this instance I think
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Old 02-28-11, 02:50 PM   #11
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Be sure you have two brakes on the bike in that case.
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Old 02-28-11, 08:40 PM   #12
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Sorry yeah it's an old 70s wheel I think, so not intended for a lock ring with the lock thread...

Any option around this??
Use your search engine of choice to look up rotofix and Loctite. Rotofix is a method to tighten a fixed cog as much as possible onto a freewheel hub that will not accept a lock ring. Loctite is a thread locking adhesive that will bond the threads of the cog and the hub. It's not an ideal solution, but it has worked for many people who did it carefully. Ideally you would get a wheel with a fixed gear hub or rebuild your current wheel with such a hub.
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