The term "650B" refers to a specific bicycle wheel size, measuring approximately 27.5 inches in diameter. This size is popular among mountain bikers because it offers a balance between the agility of smaller wheels and the stability of larger ones. The 650B wheels provide better traction and control on rough terrain, making them suitable for various riding conditions. Originally known as 27.5-inch wheels, 650B has gained traction in the cycling community since its introduction. Many modern mountain bikes are designed to accommodate this wheel size, allowing riders to enjoy improved performance and comfort. The versatility of 650B wheels has contributed to their growing popularity in both recreational and competitive cycling.