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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. [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.
A run-flat tire is a pneumatic vehicle tire designed to resist the effects of deflation when punctured, allowing the vehicle to continue to be driven at reduced speeds for limited distances. First developed by tire manufacturer Michelin in the 1930s, run-flat tires were introduced to the public market in the 1980s.
Although wheel sizes are marketed with measurements in inches, the Michelin TRX introduced in 1975 was marketed in millimeters. For example, 17 × 8.5 × +35 designates a diameter of 17 inches, width of 8.5 inches, and +35 mm positive offset (432 × 216 × +35 in fully metric numbers).
Prior to the late 1990s introduction of the Michelin PAX System [1] run-flat technology, both Michelin and Goodyear had introduced a "zero-pressure" run-flat technology, meaning that a pneumatic (air pressure-supported) tire could support itself with no air pressure. The new zero-pressure tire was a modified standard tire, constructed with a ...
Other types of light-duty automotive tires include run-flat tires and race car tires: Run-flat tires eliminates the need for a spare tire because they can be traveled on at a reduced speed in the event of a puncture, using a stiff sidewall to prevent damage to the tire rim. [34] Vehicles without run-flat tires rely on a spare tire, which may be ...
[245] 22.5-volt: Eveready 412: 15F20 (Zn/MnO 2) 215: 140: 22.5 V (15 cells) Flat round (one each end) H: 50 L: 25 W: 15 Used in older instruments. [246] the Regency TR-1 (first transistor radio), [247] and old battery–capacitor flashes. These are also sometimes known as B batteries, but are very distinct from actual B cell batteries. 30-volt ...
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