What does it mean when a motorcycle's speed does not match its gear?

[Hugo]

Different models of motorcycles have varying speed ranges suitable for each gear, and each gear can operate within a certain speed range. Higher gears generally have a broader speed range. Speed ranges: Taking a common 125CC motorcycle as an example, first gear is only used for starting or climbing very steep slopes at low speeds. After starting, you should immediately shift to second gear. Second gear is generally suitable for speeds between 10-20, third gear for speeds between 20-40, fourth gear for speeds between 30-50, and speeds above 40 can usually be maintained in fifth gear. How a motorcycle works: The intake valve opens, the piston moves downward, and a mixture of gasoline and air is drawn into the cylinder. At this point, both the intake and exhaust valves close, the piston moves upward, and the mixture is compressed. When the mixture is compressed to its minimum, the spark plug ignites it, and the resulting pressure pushes the piston downward, rotating the crankshaft. When the piston reaches its lowest point, the exhaust valve opens, expelling the exhaust gases. The piston continues to move upward to expel any remaining exhaust gases.