For model year 2000, 10-speed Record and Chorus were introduced (although the 9-speed versions were retained and refreshed). 8-speed and Avanti were discontinued, and Daytona kind-of-replaces Athena.
The derailleur range was:
* New for model year 2000
From 2000 the numbers in the first part of the model code indicated the year of introduction and the '09' in the second part of the model code indicated 9 speed, and '10' in the second part of the model code indicated 10 speed.
Browse associated derailleurs.