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Technical FAQ: Campy Chorus 9-speed derailleur with 10-speed drivetrain

Can I use a Campy 9-speed rear derailleur with a 10-speed drivetrain?

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Dear Lennard,

Can I use a Chorus 9-speed rear derailleur with 10-speed cogs, chain & Ergo shifters?
-Mark

Dear Mark,
Yes, as long as the wider jockey wheel cage does not contact your spokes.
-Lennard