Campy 9 & 10 speed question

[SteelRider]

Can I use a 9-speed chain on a Chorus 10-speed derailleur, or is the chain too wide? I've got no LBS nearby, so I'm turning to you guys.

Thanks!

[boudreaux]

Can I use a 9-speed chain on a Chorus 10-speed derailleur, or is the chain too wide? I've got no LBS nearby, so I'm turning to you guys.

Thanks!Yeah, the Chorus 10 FD has a plastic insert you remove tomake it fully 9 compatible.