Which tires require slippage marks?

Which tires require slippage marks?

• A. Tires with tubes
• B. Tubeless tires
• C. All tires
• D. Radial tires

Answer: (A)

Slippage marks are used to detect movement between the tire and wheel when a tube is present. With tires that have an inner tube, the tube can slip inside the tire or rotate independently of the bead under load, so you apply marks on both the tire and the wheel to watch for any relative movement after installation and inflation. If the marks shift relative to each other, it indicates slippage that could lead to improper seating or tube damage. Tubeless tires don't contain a separate inner tube, so there isn’t a slipping element to monitor between tire and rim in the same way, and slippage marks are not required. Radial construction isn’t the determining factor here—the presence of an inner tube is.

Slippage marks are used to detect movement between the tire and wheel when a tube is present. With tires that have an inner tube, the tube can slip inside the tire or rotate independently of the bead under load, so you apply marks on both the tire and the wheel to watch for any relative movement after installation and inflation. If the marks shift relative to each other, it indicates slippage that could lead to improper seating or tube damage.

Tubeless tires don't contain a separate inner tube, so there isn’t a slipping element to monitor between tire and rim in the same way, and slippage marks are not required. Radial construction isn’t the determining factor here—the presence of an inner tube is.