system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: What makes a tire rotation necessary? Do they switch sides when rotated?
gpt
front and rear tires wear differently because different loads are placed on them.   front wheel drive cars wear the front tires quicker.   rear wheel drive cars wear the rear tires quicker.  

left and right tires wear differently because you turn right alot more aggressively than you turn left.  and if you're driving solo, there's an extra 150-200 pounds on the left side of the car.