A 28-inch wheel refers to the diameter of a bicycle wheel, measuring 28 inches from one edge to the opposite edge. This size is commonly found on road bikes and touring bicycles, providing a balance between speed and stability. The larger diameter allows for smoother rides over rough surfaces and better rolling efficiency. These wheels typically accommodate wider tires, which can enhance comfort and grip. The 28-inch wheel size is often associated with the 700c standard in road cycling, making it a popular choice among cyclists who prioritize performance and endurance on long rides.