Which of the following statements is not true about proper tire care?
a. If you see a wear bar across the width of the tread while facing it, it’s time to replace the tire.
b. Properly-inflated tires are critical to vehicle control and good gas mileage.
c. Tire tread depth can only be checked by a properly-trained tire expert.
d. Under-inflated tires experience uneven friction and heat buildup, which can lead to blowouts.