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8.25 R 20 S1T4 R16 TTF
  • 8.25: The nominal width of the tyre's cross-section, measured in inches.
  • R: Indicates the tyre has a Radial ply construction, meaning the internal carcass cords run radially across the tyre.
  • 20: The diameter of the wheel rim that the tyre is designed to fit, measured in inches.
  • S1T4: This is a manufacturer-specific code, likely the model name or tread pattern designation, such as "Steel Muscle-S1T4" .
  • R16: This is likely a misinterpretation of the marking and usually denotes the Ply Rating (PR), indicating the number of plies used in the construction to determine the load capacity. It means 16 PR.
  • TTF: Stands for Tube Type Tyre (or sometimes Tube Type Flap), meaning the tyre requires an inner tube and flap to function correctly when mounted on the rim.
  • Application: Designed primarily for commercial vehicles like trucks and buses.
  • Construction: Radial construction provides better performance and longer service life compared to older bias-ply tyres.
  • Type: A tube-type tire requiring an inner tube.
  • Load/Speed: The "16 PR" (Ply Rating) indicates a heavy-duty load capacity suitable for carrying substantial weight under pressure. The specific load index and speed symbol are usually marked on the sidewall with a number/letter combination (e.g., 136/134K), but are not explicitly listed in the provided string.
  • Design: Often features robust tread designs (e.g., rib type or lug type) engineered for durability, improved mileage, and to prevent side-sliding on wet roads, common in commercial applications. 
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