Hamax Zenith Rear Child Bike Seat Rear mount seat for children 9 mo  48.5 lb; Adjustable features designed for single-hand operation to ensure stability. Frame Mount style (fits bike frames 28-40 mm) or Rack Mount style (fits cargo/rack carriers 120-180mm). Safety-certified, award-winning Scandinavian design; Meets tough European and ASTM safety standards. Grows with your child: Foot rests, quick-fasten/release foot straps and 2-position adjustable 3-pt harness. Comfortable design allows room for helmet; Reflective back; Optional spoke guards; Integrated, changeable padding.