Topeak Babyseat II Rear Mount Quick Release Bike Rack for BabySeat II Child Seat Maximum carrying capacity: 55 lbs. Constructed from strong, light 6061 T-6 tubular aluminum Bag compatibility: MTX QuickTrack System Features solid fender top, a mount for RedLite series Topeak lights, and a rear light mount Perfect for changing your BabySeat child carrier quickly between bikes