Schwinn .. Amplify .. 18 Inch Kids Bike .. very good pre-owned condition. Bristol Boro, Pa. 19007 The Schwinn Amplify bicycle features child-friendly geometry and comes in deep black, with blue details - this bike has color coordinated accessories including grips, seat and chain guard. Designed first and foremost with safety and enjoyment in mind, the Schwinn Amplify looks fantastic and comes complete with front and back caliper brakes, chain guard, reflectors and handlebar nameplate to ensure the bike comes with everything they need to make those first steps cycling.