Schwinn IC Pro 2004 and Later IC Pro bikes made during the 2004 model year and later. These bikes will have a serial number of XX03T or greater (where XX can be any digits).
Schwinn Airdyne AD3 & AD4 The bikes are the same except for the display console. The AD3 used an analog speedometer and AD4 has a new electronic display.
Schwinn AirDyne AD5 Pro/Comp Air-Dyne AD5 Pro/Comp.
Earlier models of the Evolution used the same bottom bracket & crank arms as the Air Dyne 4. New versions use a square bottom brac. . .