The Burley Dash FM Child Bike Seat is a frame mounted bike seat for your child. Bike rides are more fun when you can bring the kid along. You may have the extra kid-weight, maximum 40 pounds, but the seat itself is pretty lightweight. It easily attaches to round or oval tube-shaped bikes with wheel diameters of 26", 27.5", 700C or 29". No E-Bikes, so get those legs a workout.