Bicicleta Rider PJ Masks 10 This 10-inch balance bike is pedal-free, with ball bearings, plastic rims, front and rear mudguards, and safety grips. The handlebar has an adjustable height from 56 to 60 cm, and the seat has an adjustable height from 37 to 46 cm. The bike is suitable for children aged 2 to 4 years.