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4.50-12 SM12 N8 -SML
  • Tire Width: 4.50 inches (approx. 114.3 mm).
  • Aspect Ratio: Not specified in the traditional modern format (e.g., /70, /80), which typically implies a traditional "bias-ply" construction where the aspect ratio is a nominal value, often around 80-85% of the width.
  • Rim Diameter: 12 inches, meaning this tire is designed to fit on a 12-inch diameter wheel.
  • Construction Type: The hyphenated format (4.50-12) usually denotes a bias-ply (or diagonal-ply) construction, rather than radial (which would be R12).
  • Load Index/Ply Rating (N8): "N8" is not a standard load index code; it more likely refers to an 8-ply rating, indicating a durable, heavy-duty tire suitable for significant loads.
  • Tire Type/Application (SM12, SML): These are likely manufacturer-specific codes for the tread pattern or specific model, possibly standing for "SMOOTH" or a specific utility application. 
  • Application: Due to the size and likely bias-ply construction, this tire is primarily used for utility purposes such as small trailers, agricultural equipment (tractors, tillers), lawn and garden equipment, or other light industrial vehicles, rather than highway use on passenger cars.
  • Durability: An 8-ply rating indicates enhanced strength and resistance to punctures, making it suitable for rugged terrain or heavy-duty use.
  • Tread Design: The "SM12" or "SML" designation suggests a specific tread pattern, which could be smooth (often used on idler wheels or gentle surfaces), rib, or lug pattern designed for specific traction needs.
  • Usage Limitations: Tires of this size and construction generally have speed restrictions (often limited to 65 mph or less for trailer applications), and are not typically designed for high-speed highway travel over long distances.
  • Inflation: Maximum inflation pressure (PSI) will be marked on the tire's sidewall and should be adhered to for safe operation. 
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