The Dash X FM rear frame-mounted child seat reclines up to 20 degrees for ultimate kiddo comfort. Your little one can kick back for a nap or take in the scenery while you ride. And you can enjoy peace of mind knowing they're safe and secure in the Dash's five-point harness system. This Bicycle Seat must only be mounted to bicycles with the following frame characteristics:Tube Shape: Round or OvalTubing Diameter: 1. 10 - 1. 57 in (28 - 40 mm)Minimum Seat Tube Length: 4. 1 in (105 mm)Must only be mounted to bicycles with wheel diameters of either: 26", 650B/27. 5", 700C, or 29"This Bicycle Seat is compatible with E-Bikes, as long as the requirements listed above are met