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Should You Downshift When Decelerating?

1 Answers

HenryLynn

07/29/25 11:03pm

It is not a problem if you do not downshift when decelerating, but if the speed is too low and the clutch is not depressed, the vehicle may stall. Additionally, not downshifting after deceleration and then attempting to accelerate can cause lugging, which damages the transmission and negatively impacts both the engine and transmission due to the significant impact force, leading to potential harm. Therefore, it is advisable to shift gears appropriately based on the vehicle speed. Precautions for deceleration are as follows: Single-wheel passing over speed bumps: Many car owners choose to pass over speed bumps with one wheel, believing it reduces damage to one side. While this logic is correct, it overlooks the fact that all the impact force is borne by one side. Over time, this can lead to misalignment or deformation of the suspension, issues with wheel alignment, and tire wear. It is recommended to perform wheel alignment promptly. Diagonal passing: Diagonal passing is relatively straightforward—tilting the front of the car and passing over the bump sequentially. This method may feel less bumpy, but it causes uneven force distribution on the suspension system. Passing over speed bumps this way actually causes more damage to the springs and shock absorbers, and the car body also bears the force generated by the bump, making it not an ideal method. Dual-wheel passing: Dual-wheel passing is undoubtedly the best way to go over speed bumps. Although it may feel more jarring, both wheels contract and bear the force simultaneously, with the springs and shock absorbers sharing the load. Whether the suspension is independent or non-independent, it will not be significantly affected.

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