• Basically the better your cranks, chainring and sprocket the more even your chain tension will be. I have Campag Record (new ones) running to an EAI cog on one of my bikes and it's pretty perfect. But the drivetrain also costs an absolute shitload. To be honest I'd try and minimise the uneveness and then stop worrying about it. As long as it isn't varying wildly then you'll be fine.

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