Why do bicycles need two wheels?

Answer: Balance comes from motion/steering

Two wheels double the speed — Wrong. Wheel count doesn't determine speed. Two wheels provide the balance needed for stable riding through gyroscopic and steering effects.

Balance comes from motion/steering ✓ — Correct! Bicycles use two wheels aligned front-to-back for dynamic stability. When moving, gyroscopic forces and steering corrections keep them balanced. The rider can steer toward the direction they're falling to regain balance. This system only works with motion—stopped bicycles fall over.

Pedaling needs two ground points — Wrong. Pedaling doesn't require two contact points. Two wheels provide the specific geometry needed for dynamic balance while riding.