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The only unusual noise upon installing the new chainset was a strange sloshing sound that I've never experienced before (it essentially sounded like the there was too much lube so I tried a few variations yet it still persisted) which I assume was caused because by the worn out gaps between links. I think that since we know that it's the chain, I'll do a bigger ride tomorrow (30 or 40 miles should do it) and see if the noise persists or if it eases down, I can only assume that the driveline has gotten accustomed to the new chain.
I'll update the thread once there's some kind of news
wrecked
@M_V
Your theory will be at least partially correct. Though I would have thought that worn chain with new ring would run as rough as new chain with a worn ring.
It's not tension related as if it were it'd make the noise when the bike was in work stand or rear wheel lifted but it only does it under pressure so IMO it's more of a meshing problem.
I find roller chains (which I think even the cheapest izumi are) run rougher than non roller chains. Some of the roughness may die down as your chain and sprocket become used to one another but it might never be as smooth as a cheap KMC would run.