Getting your child the proper fit on a bike can seem tough, but having the right fit is the key that unlocks years of fun, healthy riding. Introducing the Fierce, a kid-friendly sidewalk bike features SmartStart technology: a major feat of kid-size engineering designed to outsmart physics so kids in motion stay in motion. Like all Schwinn bikes, the Shine comes with a limited lifetime warranty for as long as you own the bike. Start your kid out riding the Smart way on the Schwinn Fierce! SmartStart bikes are an incredible feat of kid-size engineering. From top to bottom, theyre designed to outsmart physics and help kids in motion stay in motion. Single-speed drivetrain is simple to use and easy to maintain. Includes both rear coaster brake and front caliper brake; easing the transition to a bigger, hand-brake-only bike when theyre ready. Features removable training wheels and handlebar plate for a touch of cool BMX style. Full coverage chain guard to protect little hands, feet, and clothing. 20-inch wheels fit riders 48 to 60 inches tall. Tool-free adjustable saddle allows the bike to grow with your child.