Which condition would definitely require slippage marks?

Which condition would definitely require slippage marks?

• A. Tubed tires at any pressure
• B. Tubeless tires at 150 psi or less
• C. Tires with no tubes at any pressure
• D. Tires with tubes at 120 psi

Answer: (A)

Bead slippage is movement of the tire bead on the rim during inflation or operation, and slippage marks serve as a visual reference to detect such movement. This is particularly important when a tire contains an inner tube, because the tube can slip between the bead and rim and the risk of bead seating problems or pinch flats increases as pressure changes. Since the inner tube can move independently, marking the tire helps identify any subsequent bead movement after mounting or inflation. Tubeless tires don’t have that inner-tube path for slip, so they don’t require the same slippage-mark procedure. Therefore, the condition that would definitely require slippage marks is a tubed tire at any pressure.

Bead slippage is movement of the tire bead on the rim during inflation or operation, and slippage marks serve as a visual reference to detect such movement. This is particularly important when a tire contains an inner tube, because the tube can slip between the bead and rim and the risk of bead seating problems or pinch flats increases as pressure changes. Since the inner tube can move independently, marking the tire helps identify any subsequent bead movement after mounting or inflation. Tubeless tires don’t have that inner-tube path for slip, so they don’t require the same slippage-mark procedure. Therefore, the condition that would definitely require slippage marks is a tubed tire at any pressure.