Question

1. a tire has heavy wear on both shoulders, but the center looks ok. what is the most likely cause?

• a) overinflation
• b) underinflation
• c) wheel bearing noise
• d) a/c refrigerant low

1. the placard calls for p215/60r16. the vehicle has p225/60r16 installed. does this match the placard? if not, what is different?

Explanation:

For question 9: Underinflation causes the tire's shoulders to bear more weight and make contact with the road, leading to excessive wear on both shoulders while the center remains less worn. Overinflation wears the center, wheel bearing noise does not cause this wear pattern, and low A/C refrigerant is unrelated.
For question 10: Tire sizing format PXXX/XXRXX has the first number as section width. The placard specifies a 215mm section width, while the installed tire has a 225mm section width, so they do not match.

Answer:

1. B) Underinflation
2. No, this does not match the placard. The section width of the tire is different: the placard requires a 215mm section width (P215/60R16), while the installed tire has a 225mm section width (P225/60R16).