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Which of the following is true?

A A missing clamp on a rim is dangerous and should be corrected
Missing clamps, spacers, studs, or lugs are dangerous, as are mismatched, bent, or cracked lock rings. Be sure your tires and rims are in good condition before operating your commercial motor vehicle. more
B It is safe to drive on a tire that is missing one or two lug nuts
C A cracked lock ring on a rim is safe if you are not driving faster than 55 mph