Which statement best describes the scope of the slippage marks requirement?

Which statement best describes the scope of the slippage marks requirement?

• A. Applies to all tires regardless of type or pressure
• B. Applies only to tubeless tires
• C. Applies only to tires with tubes
• D. Tires with tubes or tires rated 150 psi or less require marks

Answer: (D)

Slippage marks are visual indicators placed on tires to show whether the tire has slid or shifted on the wheel bead during mounting or service. The requirement applies to tires that have an inner tube or are rated 150 psi or less because these are more prone to bead movement and slip, which can compromise seating and safety. High-pressure tubeless tires are not required to carry these marks since their bead seating is generally more secure and the slip risk is much lower. In practice, if the marks don’t align with their expected position after servicing, it signals bead slippage and prompts rechecking the tire seating.

Slippage marks are visual indicators placed on tires to show whether the tire has slid or shifted on the wheel bead during mounting or service. The requirement applies to tires that have an inner tube or are rated 150 psi or less because these are more prone to bead movement and slip, which can compromise seating and safety. High-pressure tubeless tires are not required to carry these marks since their bead seating is generally more secure and the slip risk is much lower. In practice, if the marks don’t align with their expected position after servicing, it signals bead slippage and prompts rechecking the tire seating.