16-inch wheels ideal for riders inches tall, tool free adjustable saddle allows the bike to grow with your kid,SmartStart bikes are engineered specifically for a kid's proportions, smaller grips, and lightweight frame create an easier ride and control,Easy to remove training wheels, saddle handle for parent support for learning, full coverage chain guard to protect little hands, feet, and clothing,Rear coaster foot brake, front caliper brake, easing the transition to a bigger hand brake when ready,Arrives partially assembled, will require tools, Philips head screwdriver, Allen wrench 4mm, 5mm, 6mm, & 8mm, and adjustable wrench, pair of pliers with cable cutting ability