Schwinn Airdyne Evolution Pro/Comp Airdyne Evolution 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 . . .
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. . .