Question: Do children's bicycles often have extra wheels?, Answer:Yes, Description of Bicycle: Pedal-driven two-wheel vehicle, Fact1: Training wheels are a set of two wheels to attach to bicycles of new bike riders for additional support., Fact2: Training wheels are marketed primarily at children.
Step1: What types of bicycles have more than two wheels?, Step2: Are any of #1 customarily bought for children?, Wikipedia page for step 1: wiki: Bicycles , Wikipedia page for step 2: wiki: Training Wheels, not_definitive_answer: False, incorrect_answer: False