This 20 inch kids’ bike is a great geared bike for 6 or 7 year olds with a minimum inside leg of 55cm. Wheel Size: 20″ inchWhy buy a Frog 55?- Lightweight but sturdy Frame – Tektro brakes with small easy to reach brake lever – Shimano 8-speed gears with easy-change thumb-shifters – Patented Frog cranks for easier pedalling – Quick release seat post for easy height adjustment – Two sets of tyres: hybrid and off-road – Free 5 year warranty on frame and forks – Reflectors, mudguard* and bell included.