The Topeak Babyseat II & Babyseat II Rack (Disc) is designed to fit bikes with 26", 27.5" (650B), and 700c wheels with disc brakes. The seat has a wrap-around structure that provides excellent protection for your child. It features an updated shoulder harness with multiple height adjustments for a secure fit. The seat also has an innovative suspension system that helps absorb bumps and jolts for a smoother ride. Safety is a top priority with the Babyseat II. It has adjustable footrests and straps to keep your child's feet away from spinning wheels. The seat also has a roll bar handle that provides extra head protection and doubles as a convenient carrying handle. The Babyseat II complies with stringent European, CPSIA, and Proposition 65 safety standards.The Babyseat II Rack is included with the seat and requires no tools for attachment and removal. It features an innovative BabySeat attachment that securely holds the seat on the rack. When the seat is removed, the rack has an exposed QuickTrack® system that is compatible with all Topeak MTX TrunkBags and MTX Rear Baskets.The seat structure is made from molded engineering grade polymer for durability. Safety features include a rear reflector and a full body cocoon design. The suspension system has dual steel springs for a comfortable ride. The rack is made from 6061 T-6 hollow aluminum and has a maximum weight capacity of 27 kg (60 lb). It meets EN 14872 and ISO 11243 standards.The Babyseat II & Babyseat II Rack (Disc) is compatible with the MTX QuickTrack® system for easy bag attachment. The seat measures 77.4 x 58.5 x 39.5 cm (23" x 15.5" x 30.5") and the disc rack measures 40 x 34 x 23 cm (15.7" x 13.4" x 9"). The seat weighs 3.13 kg (6.9 lb) and the disc rack weighs 630 g (1.38 lb). Please note that the product title does not include a part number or color.