Slippage marks are required on tires that have tubes or on tires with a maximum pressure of what?

Slippage marks are required on tires that have tubes or on tires with a maximum pressure of what?

• A. 100 psi or less
• B. 125 psi or less
• C. 150 psi or less
• D. 200 psi or more

Answer: (C)

Slippage marks are used to detect movement between the tire and the wheel, which is more likely when a tire has an inner tube or when the tire’s maximum pressure is relatively low. By placing marks on the tire and on the wheel, you can visually check after inflation whether the tire has slipped on the rim or the tube has shifted. This helps prevent bead seating problems or tube damage that could lead to a failure in service. The requirement applies specifically to tires that have a tube or whose maximum operating pressure is 150 psi or less. That’s why the correct choice is 150 psi or less. Higher-pressure tires are less prone to this kind of slip, so the marking requirement isn’t applied in the same way. In practice, you would apply the marks so you can see if they stay aligned after mounting, inflation, and initial use; if the marks shift, you’d re-check seating or replacement to ensure safe operation.

Slippage marks are used to detect movement between the tire and the wheel, which is more likely when a tire has an inner tube or when the tire’s maximum pressure is relatively low. By placing marks on the tire and on the wheel, you can visually check after inflation whether the tire has slipped on the rim or the tube has shifted. This helps prevent bead seating problems or tube damage that could lead to a failure in service.

The requirement applies specifically to tires that have a tube or whose maximum operating pressure is 150 psi or less. That’s why the correct choice is 150 psi or less. Higher-pressure tires are less prone to this kind of slip, so the marking requirement isn’t applied in the same way.

In practice, you would apply the marks so you can see if they stay aligned after mounting, inflation, and initial use; if the marks shift, you’d re-check seating or replacement to ensure safe operation.