My car is Infineon q50l, which is comfortable. What are the causes of high-speed jitter and how to cure it?

It may be an obvious dynamic imbalance. Causes of vehicle vibration at a specific speed or speed: Dynamic imbalance causes vibration at a specific speed, mainly including wheel dynamic imbalance and transmission shaft dynamic imbalance. In practical use, tire repair, tire rim deformation, inconsistent number of front tire bolts and other factors will lead to tire dynamic imbalance; The bending of the transmission shaft and the loss of the balance weight will cause the dynamic imbalance of the transmission shaft. Vibration caused by dynamic imbalance. It will increase with the increase of vehicle speed.