If a tire operates at 150 psi, does it require slippage marks?

If a tire operates at 150 psi, does it require slippage marks?

• A. No, not required at 150 psi
• B. Yes, tires with tubes or tires 150 psi or less require marks
• C. Yes, but only for tubeless tires
• D. No, only above 200 psi

Answer: (B)

Slippage marks are used to detect whether a tire bead is slipping on the wheel during inflation, which helps ensure the tire is properly seated and safe. For tires that have inner tubes or for tires operating at 150 psi or less, you apply marks on the tire bead and a corresponding mark on the wheel rim. After inflating to the specified pressure, you rotate or spin the wheel to see if the marks remain aligned. If the marks move relative to each other, it indicates slippage between the bead and rim (or within the tire assembly), meaning the tire isn’t seated correctly and needs corrective seating or inspection before use. At higher pressures or with tubeless tires, the likelihood of bead slippage is much lower because the bead is held more firmly by the higher pressure and the tubeless design, so explicit slippage marks aren’t required by procedure. In the given scenario, the requirement applies because the tire operates at 150 psi or less or is a tire with a tube.

Slippage marks are used to detect whether a tire bead is slipping on the wheel during inflation, which helps ensure the tire is properly seated and safe. For tires that have inner tubes or for tires operating at 150 psi or less, you apply marks on the tire bead and a corresponding mark on the wheel rim. After inflating to the specified pressure, you rotate or spin the wheel to see if the marks remain aligned. If the marks move relative to each other, it indicates slippage between the bead and rim (or within the tire assembly), meaning the tire isn’t seated correctly and needs corrective seating or inspection before use.

At higher pressures or with tubeless tires, the likelihood of bead slippage is much lower because the bead is held more firmly by the higher pressure and the tubeless design, so explicit slippage marks aren’t required by procedure. In the given scenario, the requirement applies because the tire operates at 150 psi or less or is a tire with a tube.