A tire with tubes inflated to 180 psi requires slippage marks?

A tire with tubes inflated to 180 psi requires slippage marks?

• A. No, not required
• B. Yes, because tires with tubes require marks
• C. Yes, only if psi is below 150
• D. No, only tubeless tires require marks

Answer: (B)

When inflating a tire that has a tube, you place slippage marks so you can see whether the tire is moving on the wheel as pressure rises. The tube adds the possibility of slip between the tire bead and the rim or between the tube and the tire, which can change the bead seating and lead to improper seating or even a blowout if unchecked. By marking the tire and rim, you have a visual reference to detect any movement during inflation and after mounting, confirming that the bead has seated correctly and that there’s no unwanted slip. At the service pressure used for testing, this risk is present with tubes, so marks are required. Tubeless tires don’t have the same issue with a separate internal tube, so this particular check isn’t required for them. The requirement isn’t about a specific psi threshold like below a certain value; it’s about the presence of a tube and the associated slip risk during inflation.

When inflating a tire that has a tube, you place slippage marks so you can see whether the tire is moving on the wheel as pressure rises. The tube adds the possibility of slip between the tire bead and the rim or between the tube and the tire, which can change the bead seating and lead to improper seating or even a blowout if unchecked. By marking the tire and rim, you have a visual reference to detect any movement during inflation and after mounting, confirming that the bead has seated correctly and that there’s no unwanted slip.

At the service pressure used for testing, this risk is present with tubes, so marks are required. Tubeless tires don’t have the same issue with a separate internal tube, so this particular check isn’t required for them. The requirement isn’t about a specific psi threshold like below a certain value; it’s about the presence of a tube and the associated slip risk during inflation.