Lockring comes loose

I can tighten the Lockring against the cog as much as I want, it always
comes loose after a couple of days of riding (while skid braking o'course)
then I get about an 1/8 rotation of freespin until the loosend Cog jams against the lock ring again.
It is well greased of course so that can't be it and the other solution (apart from welding te cog to the hub)
can be skidding with less weight on the back wheel, which decreases efficency...

suggesting to this complete trivial problem are welcome !

I must be a very happy person worrying about that sort of problem

Setup?

48/17

suicide hub?

no its two threaded

i used to get that on my condor. the threads were fucked on the cheap hubs that they stuck on it and the lockring would jump over a few under pressure. i just flipped my wheel around and used the other side with a new lockring and no more problems, unless you dont have a flip flop.

I have a flip flop, but the other side is SS, without counter threading

have a close look at the threads on the lockring then, hopefully it's those and not on the hub

'Setup?' as in what kind of hub, cog and lockring.

Did you rotofix the cog before tightening the lockring?

breglis, answer tramps' question as concisely as you could... that's the one comment that matters... i know cos it happened to me - my case: maillard/normandy hub (french threading) + british sprocket + dura ace lockring (british threading) = slipping lockring = dead lockring threads.

italian/british/french lockrings are really really not to be mixed up AT ALL.

well its a formula hub and the guy at Condor was nice enough to search for the correct lockring when I bought
the 17t sprocket. So I trust the guy got it right.

But I could take a few pictures because my hubs do not yet talk to me so I cant tell
where they are from ..8-)

here
http://www.bregler.net/fix/1.jpg

http://www.bregler.net/fix/2.jpg

It looks like it says Formula on the lockring but.. what's with the apparent gap between the cog and the ring?
Is the lockring perhaps catching on some dodgy thread and not screwing right up to the cog?
Are there any burrs on the hub threads or any jagged bits on the cog or lockring surfaces that might hold them apart?

i had the same problem recently on my shitter commuter fixie, was due to crappy alloy lockring..which went into bin!

hippy It looks like it says Formula on the lockring but.. what's with the apparent gap between the cog and the ring?
Is the lockring perhaps catching on some dodgy thread and not screwing right up to the cog?
Are there any burrs on the hub threads or any jagged bits on the cog or lockring surfaces that might hold them apart?

hmm a gap ? dunt dink so
well , just just what I got sold. I will have look at the weekend.

yeah there's like a 0.5mm+ gap between the lockring and the cog...

take out the lockring and show us the threads... formula's lockrings should be quite decent...

one thing you can try is to flip the lockring over so that the formula markings face the cog. think i remember the lockring is rounded on the side without text maybe that accounts for that gap we see in the picture.

the text side should give you more contact surface area with the cog to hold everything in place.

Thanks Ed

that gives me a good perspect to work on.
I checked the Lockring, and its correct the one side
has a beveled outer rim.But maybe the bigger
surface pressure will do the trick.

Will try and let you know. and show pics