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How should correct inflation pressure for a truck tire be determined?
- A.By using the pressure the tire happens to have after a run
- B.By adding air until the sidewall looks round
- C.From the vehicle maker's recommendation for the load and the tire sidewall limit, checked with a gauge while the tire is cold
- D.By kicking the tire and judging the bounce
Correct answer
C. From the vehicle maker's recommendation for the load and the tire sidewall limit, checked with a gauge while the tire is cold
Why
A thump cannot tell 80 psi from 50 psi, and a hot tire reads higher than it really is. Cold checks with a real gauge, against the specified pressure for the load being carried, are the only reliable routine.
Manual topic: Tires - Inflation · From the General Knowledge practice bank (GK-222).