The Topeak BabySeat II with Disc Compatible Rack features a wrap-around seat structure for added protection. An updated shoulder harness with a multiple height adjustment system and an innovative suspension system that cushions bumps and jolts. For 29" wheels with disc brakes. 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-QuickTrack rack system is compatible with all Topeak MTX TrunkBags and MTX Rear Baskets.