Children's bike specifications ROCKBROS DARWIN I 12 Weight: 2.8 kg Frame: Aluminum Fork: Aluminum, rigid Wheels: 12″ aluminum Tires: 12″ x 1.75″, puncture-proof (with car valve – A/V) Handlebar: 40.6 cm x 39.8 cm, aluminum riser type Stem: Forged aluminum Saddle: Ergonomic Seatpost: Steel Hubs: Aluminum bearings Spokes: 14G Carbon Steel with Brass Nipples Grips: Soft rubber for better comfort and control Geometry: Low standover height Intended use: For toddlers and young children (ages 1–4)