Chainline noise - videos/photo

Turns out it was just the cog. I've put a new one on and it's all good now, give that a go :-)

I like the fact that someone clearly pops a bottle of champagne off camera halfway through that first vid. And the hamster. There's more to this one than meets the eye. I think we should be told!

I have a similar but not quite so noisy problem as to OP.

I haven't checked this by measuring or asking anyone who knows but my chain, which I believe to be 1/8, seems much wider than the teeth on my chainring. As far as I can tell the noise is being generated by the chain moving laterally across the chainring. What seems to make the difference is that I've got the chain tension too high which causes a slight twist in the chain where it sits on the chainring causing it to ping across rather than just slide.

I've just been too lazy to sort it but as I got a slow puncture this morning I'll prob get round to doing something about chain tension at the same time.

After buying a fairly worn 1/8th 17t cog from a forumger to replace the 3/32nd pressed one I have noticed an 'orrible noise coming from what I think is the rear. This is on a Langster with a Planet X track hub, BLB cog, Izumi chain and Truvativ outboard bearinged road crank with the sprocket on the outside.

I first suspected the worn cog to be the problem but now concerned it is the chainline itself- the noise only really happens when I an powering up a hill or accelerating.

Any ideas? I have ordered a new cog and was thinking I might need to re-space the rear wheel to square up the chain line- then re-dish the wheel obv.

I've known worn cogs to be noisy.

What's an "'orrible noise". I consider mine to make an awful noise when the chain is all gritty and at this time of year even with my new cog, chainring and chain it takes about 150-200 miles to sound grim to me.

If it's a track hub I'd be careful spacing out the cog I wouldn't go more than 2-3 mm as you need to make sure there are enough threads of the cog engaged with the hub. I'm not sure why you would need to redish the wheel.

Thanks for the input chaps, but a new cog from velo solo has saved the day! The noise I think resulted from each link being pulled into the worn cog then released, sounded like one of Tricky's most eclectic offerings.