The biggest difference between mountain bikes and ordinary bicycles is that they can change speed according to the actual situation.
Do not allow persons under the age of 16 to drive this vehicle. Never allow anyone with a cognitive impairment or disability to drive this vehicle.
Add electrolyte to the battery to make it react naturally for 30 minutes, and then connect the cable, the red is connected to the positive "+", and the green is connected to the negative "-".
Always check whether the engine, gearbox and braking device are overheated, and whether enough lubricating oil is added to the lubricating parts. If there is overheating, the cause should be found out
