How Sharp is Your CDL Pre-Trip Inspection Knowledge?Share:FacebookPinterestTwitterMailWhat is a sign you need to replace a tire?28%Next Correct Incorrect Tread depth below 2/32 inch means less grip. Tires with low tread are more likely to skid. What is a sign you need to replace a tire? Valve stem shiny Tread depth below 2/32 inch Tire inflated fully Sidewall dirty 28%