The Mitygoose 16" Boys Bike from Mongoose is built with a lightweight alloy sidewalk frame with components that are tailored for the young rider. The Ladygoose also comes fitted with a kids specific handlebar for optimum comfort. Sizes: 16" Frame: alloy Crank: 1 piece forged steel. 127mm 32T steel chain ring Bottom Bracket: American Loose Ball Cog Set: 16T coaster brake cog Wheel Size: 16" Rims: Alloy single wall 20H Rear Hub: 20H Steel, 3/8" axle Coaster Brake Tires: 20 x 2.125 Pedals: Plastic body with 1/2 axle Brake: Coaster Brake & Alloy Caliper Front Handlebar: Mongoose Hi-Ten 7" Stem: Alloy/Steel 30mm Ext quilled Headset: Threaded Brake Levers: Short reach Spokes: 14G stainless steel Saddle: Mongoose Kids Seat Post: Steel 25.4