A tubed tire at 150 psi requires slippage marks?

• A. Yes
• B. No
• C. Only if tubeless
• D. Only if above 150 psi

Answer: (A)

Slippage marks are used to detect movement of the inner tube inside a tubed tire when it’s inflated to service pressure. As the tire is pressurized, the tube can shift relative to the tire and even the bead, which can lead to improper seating, bead displacement, or heat buildup. By placing marks on the tire (and a reference on the tube or wheel), you can see if the tube slips during inflation or operation; if the marks move, seating is not correct and action is needed. At the stated service pressure of 150 psi, applying these marks helps confirm proper seating and detect any slippage, so the correct choice is that you should use slippage marks. For tubeless tires, this specific tube-tube slip check isn’t applicable, and the other options don’t fit the scenario.