Let me give you a comparison with 26 and 29. Rambo 770 is 27.5 inches, which is quite close to 26 inches, but its obstacle-crossing ability, rolling inertia and handling stability are all close to 29 inches, which is why Merida decided to embrace and support 27.5: from the hard-tailed mountain bike for exercise and fitness to the soft-tailed mountain bike with full shock absorption, the wheel diameter of 27.5 has improved the overall riding experience and efficiency, and that's all I know! It is suggested to pay attention to the "eggshell man" on WeChat platform. He will talk a lot about bicycles.