Which option correctly summarizes the slippage marks rule?

Which option correctly summarizes the slippage marks rule?

• A. All tires require marks no matter what
• B. Only tubed tires require marks
• C. Only tires at 150 psi or less require marks
• D. Tires with tubes or tires 150 psi or less require marks

Answer: (D)

Slippage marks are used to detect movement between the tire and the wheel when a tire is in service. You place a reference mark on the tire and a corresponding mark on the wheel so you can see if the tire bead or the tube has slipped relative to the rim after installation or during operation. The requirement applies when a tire has an inner tube or when the tire pressure is 150 psi or less because these conditions increase the likelihood of slip between components. Tubed tires can experience tube movement independently of the tire, and low-pressure tires are more flexible and prone to bead or tube shift. By marking tires under these conditions, you can readily identify any slippage during inspection or after maintenance. So, the option that includes both tubed tires and tires at 150 psi or less correctly summarizes the rule.

Slippage marks are used to detect movement between the tire and the wheel when a tire is in service. You place a reference mark on the tire and a corresponding mark on the wheel so you can see if the tire bead or the tube has slipped relative to the rim after installation or during operation.

The requirement applies when a tire has an inner tube or when the tire pressure is 150 psi or less because these conditions increase the likelihood of slip between components. Tubed tires can experience tube movement independently of the tire, and low-pressure tires are more flexible and prone to bead or tube shift. By marking tires under these conditions, you can readily identify any slippage during inspection or after maintenance.

So, the option that includes both tubed tires and tires at 150 psi or less correctly summarizes the rule.