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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.
Toyo Tire & Rubber acquires a capital interest in Cheng Shin-Toyo Tire & Rubber (China) Co., Ltd December 1998: The Itami Manufacturing Complex is closed September 1999: Toyo Tire & Rubber forms a business partnership with Kinugawa Rubber Industrial Co., Ltd., April 2000: The East Japan Automotive Parts Technical Center is opened December 2000
Uniform Tire Quality Grading, commonly abbreviated as UTQG, is a set of standards for passenger car tires that measures a tire's treadwear, temperature resistance and traction. The UTQG was created by the National Highway Traffic Safety Administration in 1978, a branch of the United States Department of Transportation (DOT). [ 1 ]
Increasing the aspect ratio will increase the height of the tire and hence the circumference. Off-roading tires may use a different measurement scheme: Tread width × Outside diameter, followed by wheel size (all in inches) – for example 31×10.50R15 (787 mm × 267 mm R380 in metric designation). The size of the wheel, however, is denoted as ...
ISO 5775 is an international standard for labeling the size of bicycle tires and rims. The system used was originally developed by the European Tyre and Rim Technical Organisation (ETRTO). It is designed to make tire sizing consistent and clear.
Plus sizing is the practice of replacing an automotive wheel with one of a larger diameter fitted with a new tire of lower aspect ratio so that the new tire has close to the same diameter and circumference as the original tire to minimize any changes in speedometer accuracy, torque and traction control, while reducing sidewall flex and (generally) increasing cornering ability.
A cross-section of a tire. Number 12 indicates the radial ply. Numbers 14 and 16 are bias plies. A radial tire (more properly, a radial-ply tire) is a particular design of vehicular tire. In this design, the cord plies are arranged at 90 degrees to the direction of travel, or radially (from the center of the tire).
For the 1981 season the maximum diameter of the rear tyre was limited to 26.0", while the diameter of the front tyres was increased. Therefore, from 1981 until 1992, Goodyear supplied white sidewall marked Eagle tyres with the sizes of 25.0"×10.0"–13" in the front and 26.0"×15.0"–13" in the rear. [6]