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How can I reduce Chordal Action

Bicycles Asked on February 27, 2021

I have an indoor, wheel on trainer – while indoors I notice the Chordal Action in the chain.

The Bike is a couple of years old now – I have replaced most consumable parts except, chainrings, bottom bracket and jockey wheels.

Shifting feels fine.

I do think my chain is pretty slack on the high gears – but only just about fits in the lowest.

Chain and cassette are fairly new, less than 500 miles. Chain is lubricated with "Finish Line Ceramic Wax"

Would it help if I changed the jockey wheels ?

2 Answers

Perhaps your chain is too long by a few links and/or an adjustment of your b screw could allow you to shorten the chain.

Answered by Tude Productions on February 27, 2021

Switch to larger chainrings and cogs. The old "standard" 53-39 rings and 12-something cassette were standard for a reason. The tightness of the chain doesn't really have anything to do with this problem.

Answered by ojs on February 27, 2021

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