At what speed can you shift to third gear?

[Maddox]

When the vehicle speed reaches 20 km/h and the engine speed reaches around 2000 rpm, you can shift to third gear. Below is a detailed introduction about car gears: Speed range: First gear corresponds to 0-5 km/h. Second gear corresponds to 5-20 km/h, third gear corresponds to 20-40 km/h, fourth gear corresponds to 40-60 km/h, and fifth gear corresponds to 60-100 km/h. Gear shifting timing: For most cars, the ideal shifting time is when the engine speed is at 2000 rpm, and it should not exceed 2500 rpm. For some high-displacement and high-power engines, you can shift gears at around 3000 rpm.

[OJosiah]

This depends on the tachometer, not the speedometer! With over a decade of manual transmission experience, I've found that shifting to third gear at 2000 to 2500 RPM is optimal. Driving instructors often say to shift between 20 to 30 km/h, but shifting without reaching the proper RPM will cause lugging. Last week, I repaired a car with severe shaking because the owner kept forcing third gear at 15 km/h—the clutch disc was completely worn out. Remember, shift when the engine sound becomes deep and full, which is more reliable than memorizing specific numbers. When the engine is cold, slightly higher RPMs are better to protect the transmission.