SID Charger 2 Race Day Upgrade Kit. Have any questions on an item? The SID Charger 2 Race Day Upgrade Kit shows Rockshox's dedication to those of us with older model-year forks whom still want best-in-class performance. This upgrade kit replaces our old non-air side chamber with a much more supportive suspension package.
The Charger 2 has been tested in some of the most abused forks in the world and does away with maintenance issues of the past. More links or text can go here.