Skateboard wheels are a crucial component of a skateboard. They come in different sizes and hardness levels, which can affect the board's performance and ride. Larger wheels are better for cruising and carving, while smaller wheels are better for tricks and flips. Harder wheels are faster and more durable, but can feel less comfortable on rough surfaces, while softer wheels provide better grip and a smoother ride. The durometre, or hardness level, of skateboard wheels is measured on a scale from 1 to 100. A lower number indicates softer wheels, while a higher number indicates harder wheels. The ideal durometre depends on the type of terrain you'll be riding on and your personal preference. Softer wheels are better for street skating and rougher surfaces, while harder wheels are better for smoother surfaces and ramps. Overall, choosing the right skateboard wheels can greatly enhance your riding experience and performance.