The thule ridealong rear child seat can be mounted and dismounted from the bike in seconds with a universal quick release bracket and will fit most bike frames 72 40 mm diameter round frames and maximum 40 x 55 mm oval frames also featuring thules dualbeam suspension system the thule ridealong rear child seat produces a smooth and comfortable ride for your child the thule ridealong rear child seat has safety at the heart of its design with an adjustable 3 point harness with the