Product description S36L3 21.5" Exercise Bike Merach Screen Series 21.5" Display Size 21.5" Electronic Magnetic Resistance System Electronic Magnetic 16 Resistance Levels Resistance Level 16 Resistance Levels 330 lb Weight Maximum 330 lb Level 4 FlywheelClass Level 4 S36B3 21.5" Exercise Bike Learn More S29R3 21.5" Exercise Bike Learn More S26B4 15.6" Exercise Bike Learn More