Sirrus X 2.0 Step-ThroughSirrus X 2. 0 Step Through is the Sirrus X 2. 0 in a low step frame for easy mounting and dismounting. Same A1 Premium Aluminium frame geometry, hydraulic disc brakes, and 1x drivetrain in a frame designed for riders who prefer not to throw a leg over a high top tube. Key Features Specialized A1 Premium Aluminium frame, Step Through Fitness Geometry Hydraulic disc brakes strong stopping for mixed surfaces 1x Shimano drivetrain simpler than 2x, easier