Thule RideAlong Frame Mount Child Seat: GrayThule RideAlong Frame Mount Child Seat: Black. Thule RideAlong Child Seat the classic safe and easy to use reclining child bike seat taking your daily commutes and family bike adventures to the next level. Seat can be mounted dismounted from bike in seconds with the universal quick release bracket fitting most bike frames (27. 2 40 mm diameter round frames and maximum 40 x 55 mm oval frames) Integrated protection wings safeguard your childs hands when