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ETRTO sizes apply to rims and tyres for vehicles of all types, including bicycles. The great advantage of ETRTO sizing is that it is unambiguous; previously, nominal dimensions were used which were interpreted in different ways by different countries and manufacturers - a problem for the end user.
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. [29] 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.
In 1906, Henry Ford chose Firestone to supply tires for its car models. [7] In 1918, Firestone Tire and Rubber Company of Canada was incorporated in Hamilton, Ontario, and the first Canadian-made tire rolled off the line on September 15, 1922. [8] During the 1920s, Firestone produced the Oldfield tire, named for racing driver Barney Oldfield. [9]
If your tire size has two sets of numbers (6-12, 5.00-15, 11.2-24…) the first number (5.00-15) is the approximate width in inches; the second number (5.00-15) is the rim diameter. If your tire size has three sets of numbers (15/6.00-6, 26/12.00-12, 31/15.50-15) the first number ( 26 /12.00-12) is the approximate height, the second number (26/ ...
Firestone constructed hangars, ancillary buildings, and an 8,700 foot runway on the site. [9] Advertisement for Firestone's factory and exhibition building at the World's Fair showing Liberians harvesting and transporting rubber. The Firestone Plantation was originally envisioned for 350,000 people to be employed on the newly created plantations.
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.