Kids’ Bike Size Chart Choose a Bike Size: Select Size 12-inch (2-4 years) 14-inch (3-5 years) 16-inch (4-6 years) 18-inch (5-7 years) 20-inch (6-9 years) 24-inch (8-12 years) 26-inch (10+ years) Age Range: Height: Inseam: Wheel Size: