Old 07-10-18, 08:41 PM
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Andrew R Stewart 
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Originally Posted by Abu Mahendra
Chordal action can be increased/decreased by chainline. Putting a spacer in the BB, bringing the chainline a bit outwards helped to reduce the vibration in my bike, though not completely eliminate it.
Not sure this is true since chordal action is an issue of tooth count and power pulses. How the chain feeds off the cog isn't an aspect of chordal action. But really poor chain angle will induce some amount of roughness rhythmic with each tooth/link release. Andy
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