On my last couple of rides ive noticed that i get a very load buzz / whirrrr sound (like something is rubbing on the chain but it isnt) but only when i’m pushing hard like on a climb.

My mate claims my chain seems to be sticking to the bottom of my chainring rather than coming away in a straight line from the bottom of the ring. Not full on chainsuck but similar. Ive cleaned both chain and ring fully and re-lubed but this still happens.

As its a constant noise rather than off/on im ruling out a bent tooth etc.

Any ideas cos im now lost?

Cheers

I’m assuming that you have a single narrow-wide style chainring? Is it new?

I had this problem for the first 100 or so miles with one of my chainrings, I think it was a superstar components one, it went away with a bit of use/ware

Or an old worn chainring. Especially n/w chainrings.

Does it happen in every gear? On every climb or just on really hard efforts?

Nothing else flexing and rubbing as you apply power?

Hi,

yes its a narrow / wide single ring. On one to be exact. Had it about a year and a half but to ridden as often as many on here. But i have been hitting the grittier parts of the peaks a fair bit recently. So do you think its a worn chainring?

Yes its in every gear and pretty much as soon as i start climbing anything nairnster

Intermediate use for a year and a half will wear a narrow/wide to the point of noise I reckon.

I’m with Yak on this. Your chainring is worn. Experienced this myself very recently after building a new bike up. Changed cassette and chain but not chainring. It was doing exactly what yours is. New chainring solved the problem.

On the strength of the singletrack hive mind i have just ordered a new absolute black narrow wide oval chainring. Thanks everyone.

Had it about a year and a half but to ridden as often as many on here.

If i read that right, it’s now less used than when new?

Have a quick check, that the chain is the right way around the tab on the rear mech.