No matter which city you are in, there is no problem if you just modify the wheel hub slightly, but you can't seriously modify it. Excessive modification is illegal.

According to the Road Safety Law of the People's Republic of China (1), if the car body color is changed and the engine and frame of the vehicle are not replaced within 10 days, a warning or a fine of not more than 200 yuan will be imposed. 2. Whoever changes the engine type, refits the exhaust pipe of the vehicle, installs the rear guide wing of the vehicle, or installs a searchlight in front of the vehicle, shall be ordered to make restitution, and be given a warning or a fine of not more than 500 yuan. 3 for domestic vehicles, replace the tire size and install the body protection device, shall be ordered to restore the original state, and impose a warning or a fine of not more than 500 yuan.