What is the gear speed ratio?

1 Answers
AlainaLynn
07/30/25 9:54am
Generally, high-revving engines in French cars follow a shift-up pattern of 20 km/h in 2nd gear, 40 km/h in 3rd gear, 60 km/h in 4th gear, and 80 km/h in 5th gear. For low-revving engines, the pattern is 10 km/h in 1st gear, 30 km/h in 2nd gear, 40 km/h in 3rd gear, 60 km/h in 4th gear, and 80 km/h in 5th gear. Additional information: The principle for deceleration and downshifting is to reduce speed first, then downshift, and skipping gears is allowed. In automatic transmission vehicles, speed and gear should correspond to each other. When the speed matches the gear, the vehicle's performance is at its optimal state, and the thermal efficiency of fuel is the highest. If the speed and gear are mismatched, such as high speed with low gear or low speed with high gear, it will not only increase fuel consumption but also cause damage to the engine and transmission, leading to irreversible harm to the vehicle. Therefore, it is essential to maintain the proper match between gear and speed while driving.
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