What are the speeds for upshifting and downshifting?

[DeLeo]

When the speed is between 10-20 km/h, shift to 2nd gear; when the speed is between 20-30 km/h, shift to 3rd gear; and when the speed is between 30-40 km/h, shift to 4th gear. After selecting the appropriate gear, perform the shifting operation. When upshifting, the action should be swift and smooth, and avoid looking down at the gear lever. Below are some precautions for gear shifting while driving: 1. Overtaking: Upshift when overtaking, as higher gears provide lower torque, which can actually slow down the car during acceleration. 2. Avoid looking down at the gear lever when shifting: This can easily lead to rear-end collisions and other traffic accidents. 3. Not fully depressing the clutch when shifting: Failing to fully depress the clutch when shifting can cause gear grinding in the transmission. Frequent gear grinding can reduce the lifespan of the transmission and, in severe cases, may even cause the transmission to fail on the spot.