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2. Tire code - Wikipedia

   en.wikipedia.org/wiki/Tire_code

   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.

3. Wheel sizing - Wikipedia

   en.wikipedia.org/wiki/Wheel_sizing

   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 ...

4. Plus sizing - Wikipedia

   en.wikipedia.org/wiki/Plus_sizing

   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.

5. Ford Model TT - Wikipedia

   en.wikipedia.org/wiki/Ford_Model_TT

   The Model TT was very durable for the time, but slow when compared to other trucks. [5] With standard gearing, a speed of not more than 15 mph (24 km/h) was recommended, and with special gearing, a speed of not more than 22 mph (35 km/h) was recommended. [6] Standard worm gear ratio is 7.25:1, and special gearing gives a ratio of 5.17:1.

6. Uniform Tire Quality Grading - Wikipedia

   en.wikipedia.org/wiki/Uniform_Tire_Quality_Grading

   The test tire is installed on an instrumented axle of a traction trailer, which is towed by a truck at 40 miles per hour (mph) over wet asphalt and concrete surfaces. The tow truck is equipped with an on-board water supply system that sprays water in front of the test tire.

7. Bar grip - Wikipedia

   en.wikipedia.org/wiki/Bar_grip

   The first deliberate uses of bar grip tyres as off-road tyres, were developed pre-war as truck tyres particularly for army use. They used crosswise tread bars for grip, arranged in a helical pattern. [4] A helical pattern was used to avoid the uneven rolling radius and vibration of a tread with simple crosswise bars and large gaps between.