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Thanks for the replies. I did go to a local shop and got the same advice. Will write a follow-up in two weeks time to tell you how it goes. Again, thank you for your answers

The cog has a couple of years (maybe around 5.000 km) but it's a dura ace - i thought it will last longer. I did check the teeth of the cog and they seem fine. Thanks for the quick reply. I would like to add that this was not a problem before and now, especially when I pedal hard (out of saddle) I feel a certain vibration in the pedals (that's when the chain rattles like crazy), i don't know exactly how to describe it, it is like the chain would have trouble entering on the chainring/sproket, like something is holding it up , it doesn't slide easily on each link (like a clicking thing) and this is sent out through the pedals (sorry for my poor description, not a native English speaker).

Hello there,
I am new to the forum so I want to signal a problem I just encountered.
I have bought a stronglight crankset (165mm, 48T) and bought a new chain (KMC Z510) but I noticed alot of chain noise compared to my previous setup -cheap sturmey archer fct26 crankset. So when looking closer I noticed a certain wobble of my chainring (checked and it's not the bb).
I posted a link with a short video - http://videobam.com/nTicm
The wobble is both sideways and back forth from what I noticed. I assume this is the source of the massive chain noise( chain tension is ok). Can I do anything about this, besides changing the cahinring ( I just received it so don't really like to spend another 30-40 pounds for a new chainring)
anybody face this issue?
Thanks

is the Omnium crank still available? Is it 165mm? Interested in buying, I would pay shipping to Romania
Thanks

is the frame still available?