As long as the four-wheel alignment is done well, it will never eat tires, which has nothing to do with what is added (normal use, no deformation of vehicle parts). Go to the 4S shop for positioning, because the original factory data is biased. The 4S shop knew what angle to adjust, as if they were going to adjust negatively, but forgot the details. I have never heard of your statement. That's unprofessional. Eating tires: that is, the tire is eccentric, that is, the wheel angle is wrong, and four-wheel alignment is needed. No matter what the reason, even if there is a problem with the factory angle, it can be adjusted back to the appropriate position through four-wheel positioning in the later stage. That thing they asked you to install is at best to make up for their lack of technology ~ .....