The new generation of IFI Wheels and Sprockets will be released for sale this December in time for the upcoming FRC season.
At that time, the current IFI Wheels and Sprockets will no longer be sold. If you want to purchase the 2006 version, you need to do so soon.
http://www.ifirobotics.com/robot-traction-wheels.shtml
http://www.ifirobotics.com/sprockets.shtml