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Prior to 1964, tires were all made to a 90% aspect ratio. Tire size was specified as the tire width in inches and the diameter in inches – for example, 6.50-15. [24] From 1965 to the early 1970s, tires were made to an 80% aspect ratio. Tire size was again specified by width in inches and diameter in inches.
Normal-size passenger vehicles, commonly called "3 number" in reference to their license-plate prefix (trucks and buses over 2000 cc have license plates numbers beginning with 1 and 2 respectively), are those more than 4.7 m (15.4 ft) long, 1.7 m (5.6 ft) wide, 2 m (6.6 ft) high or with engine displacement larger than 2,000 cc (120 cu in). This ...
In some countries — such as the United States — SUVs have been classified as "light trucks", resulting in more lenient regulations compared to passenger cars. The predecessors to SUVs date back to military and low-volume models from the late 1930s, and the four-wheel drive station wagons / carryalls that began to be introduced in 1949.
Increased fuel efficiency and tire mileage overcame the higher price of radial construction. According to a 1976 study, more police departments used steel or fabric radial-ply tires than belted bias-ply and bias or cross-ply tires for their pursuit cars. [15] Goodyear Polyglas tires are now manufactured for owners of period cars. [16]
Example of tire sizing on an all-terrain vehicle. Modern road tires have several measurements associated with their size as specified by tire codes like 225/70R14. The first number in the code (e.g., "225") represents the nominal tire width in millimeters. This is followed by the aspect ratio (e.g.,"70"), which is the height of the sidewall ...
They highlighted that, in reality, EVs are substantially heavier because “batteries store far less energy per pound than liquid fuels,” resulting in 15% to 30% greater weight.