For 26", 27.5" (650B) & 700c wheels with disc brakes A wrap-around seat structure creates a virtual cocoon of protection and features an updated shoulder harness with a multiple height adjustment system. An innovative suspension system cushions bumps and jolts and the integrated roll bar provides extra head protection and doubles as a carrying handle. Adjustable footrests and straps keep small feet away from spinning wheels. Child seat complies with stringent European, CPSIA and Proposition 65 safety standards. The included heavy-duty disc mount rack features an innovative BabySeat➢ attachment that requires no tools to attach and remove seat from rack. Once the seat is removed, the exposed QuickTrack® system is compatible with all Topeak MTX TrunkBags and MTX Rear Baskets.SEAT STRUCTURE Molded engineering grade polymerSAFETY FEATURES Adjustable foot rests with straps, Roll bar handleShoulder harness with multiple height adjustment systemFull body cocoon Rear reflectorSUSPENSION Dual steel springRACK 6061 T-6 hollow aluminiumMAX WEIGHT CAPACITYBabySeat -22 kg / 48.5 lb (Meets EN-14344 Class A22 regulations)18 kg / 40 lb (Meets ASTM F1625 regulations)Rack -27 kg / 60 lb, Meets EN 14872 / ISO 11243BAG COMPATIBILITY MTX QuickTrack® systemSIZE 77.4 x 58.5 x 39.5 cm / 23” x 15.5” x 30.5” (Seat) 40 x 34 x 23 cm / 15.7” x 13.4” x 9” (Disc Rack)WEIGHT 3.13 kg / 6.9 lb (Seat) 630 g / 1.38 lb (Disc Rack)