Please note that there is a difference between the single-speed model and the 7-speed model, so please pay attention when purchasing! Dimensions: The 20-inch bike is ideal for children aged 7 and over and a rider height of approximately 117-145 cm. The 24-inch bike is ideal for children aged 9-12 and a rider height of approximately 132-155 cm. For a safer ride: Equipped with front and rear V-brakes and handbrakes for greater stopping power. With wide 2.125-inch tires, a comfortable padded saddle, non-slip resin pedals, front and rear reflectors, and a kickstand for added safety and comfort. Durability and comfort: Durable Hi-Ten steel frame and fork; rear tires provide good traction in wet and dry conditions. The soft saddle offers excellent outdoor riding comfort. - --