| Schwinn AD4 Airdyne | Schwinn Airdyne Evolution Comp | Schwinn AD2 Airdyne |
| Drive System | Dual-stage chain and belt drive | Dual-stage chain and belt drive | Single stage-belt drive |
| Number of Workout Programs | 2 | 2 | |
| Workouts | Simultaneous upper / lower body or upper body workout only | Simultaneous upper / lower body or upper body workout only | Simultaneous upper / lower body or upper body workout only |
| Display Readouts | Time, Distance, Calories, Calories per Hour, RPM, Workload, and Heart Rate | Time, Distance, Calories, Calories per Hour, RPM, Workload, and Heart Rate | Time, Distance, Calories, RPM |
| Product Dimensions (L x W x H) | 50 x 22.5 x 48 inches | 50 x 22.5 x 48 inches | 58 x 25 x 48 inches |
| Warranty | Frame: 30 years, Parts: 3 years, Electronics: 3 years, Labor: 1 year, Wear Items: 1 year
| Frame: 30 years, Parts: 3 years, Electronics: 3 years, Labor: 1 year, Wear Items: 1 year | Frame: 5 years, Parts: 1 year, Electronics: 1 year, Labor: 90 days, Wear Items: 90 days |