Campy cassette changing question

ketsbaia Posts: 1,718
edited September 2010 in Workshop
Just about to swap a 14-28 tooth cassette for a 11-23 tooth cassette, but am wondering whether the fact I have a long-cage rear mech will cause any issues.

Will it be OK, or do I need to buy a medium/short cage instead? It's a 9-speed cassette, if that's any help.