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Another thought comes to mind:
If the momentary 'rumbling' appears to be periodic, but at a different rate between different chainrings, that suggests a stuck link in the chain.
A typical chain has about twice as many links as the number or teeth on a (standard road) outer chainring, so a stuck link passing through the drive train will be felt roughly every two crank revolutions. A typical chain has about 3 times the number of teeth on a (standard road ) inner chainring, so a stuck link passing through the drivetrain will be felt roughly every three crank revolutions.
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09-20-2017, 12:16 PM
Threaded Mode