There are three main choices for kayak cart wheels: pneumatic, never-flat, and balloon. Pneumatic tires are rubber and filled with air. Large knobs on the tires offer more traction and the air-filled wheels absorb shock and vibration. Air-filled tires are quieter, too. Never-flat tires require no maintenance, aren’t affected by temperatures or sharp objects, and are always ready to go. For rough terrain and sand, nothing beats oversized, low pressure balloon tires. These wheels look like a large beach ball and spread out the kayak weight so the tire doesn’t sink into soft surfaces. The low-pressure tires absorb shock and vibration for a smooth roll to the kayak launch. Even large logs and rocks won’t stop the all-terrain balloon tires.