Round Black Donuts, or in Other Words, Tires Part 2 Bob White ...

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of gravity and front axle are determined during manufacture. Thus, an auto-x/super tire set with front tires having 375 lbf/deg of cornering force compared to just a good tire with 275 lbf./deg. results in about a 36% increase in the rate of vehicle initial response. This article is about tires and how they come to be selected for your car. However, how the tires effect the vehicles response and feel also depends on the properties of those tires.That is why the driving tests by both the tire and car manufacturer are so important to the feel that are associated with Porsche or Corvette or Mercedes-Benz and Lexus. So lets hear it for the engineers, expert drivers, and their companies that understand the importance of that feel to their customers. A final note on a related but some what different aspect of tires. Earlier it was pointed out that the average car owner only has a flat tire on average every 60,000 miles. In some countries, Germany for example, a tire may not be repaired, no plugs for a nail in a tire. The tire must be replaced regardless of whether it has been driven 10 or 100 or 10,000 miles. The figure below is a photograph of the inside of a tire that has had a nail hole repaired with a plug. There is an almost one inch high by one quarter inch in diameter piece of the rubbery filament used for the plug sticking out of the carcass of the tire. Figure no. 11 An Inside view of a Plugged Tire It is about as resilient as a piece of hot dog although stronger. So when you are driving it is bent by the centrifugal force and flops around every time the brakes are applied, steering inputs change the car’s direction or bumps or tar strips flex the tire. Think about that the ext time you are going over the speed limit with a tire on your car that has a plug
in it. Seems like the Germans may have it right, especially with many parts of the autobahn still without speed limits.
Page 1 and 2: Round Black Donuts, or in Other Wor
Page 3 and 4: Let’s start with friction. The co
Page 5 and 6: B 245/575 - 15 slick (12 K x 15) C
Page 8 and 9: Figure no. 6 Tire Cornering Side Fo
Page 10 and 11: Figure no. 8 Cornering Force Coeffi
Page 13: Figure no. 10 Definition of how a C

Round Black Donuts, or in Other Words, Tires Part 2 Bob White ...

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