Topeak BabySeat Child Bike Seat Rack (Disc Mount Version) Used by both professional and amateur riders alike Made using high quality materials and components Tested to ensure quality and durability Braze-On Type Heavy Duty Aluminum 2950 g / 6.5 lbs (Seat), 1680 g / 3.7 lbs (Disc Rack) MTX QuickTrack Compatible Fits Frames w/discs RedLite Mount Tail Light Mount