Yes the air pressure will increase when the tire warms from use, you should inflate it to manufacturers specs written either on the tire or on your car door when "cold" ( driving a mile or so to the gas station is fine), any increase from heat has already been taken into account by the manufacturer. And no, if there was not a significant change in temperature outside, 6psi. is a substantial amount to have dropped. There have been some recent recalls on valve cores and valve stems for such reasons. So check with the tire shop that put them on to see if they have had any problems. and only use the manufacturers specs of pressure on your car. the specs on the tires are the max pressure of that particular tire. not of your car. always go with what the owners manual recommends.
Formula 1 cars use tires called slicks. Likewise, Drag racing cars use slicks, and NASCAR uses slicks as well, the tires are just of different sizes. The difference between slicks and normal tires is vast. Slicks are soft rubber tires, with no tread. At first, this can be dangerous, as your tires have no traction, or they are "Slick". However after a few laps around the track, or after a long burnout (Drag racing) the slicks heat up, and become sticky, they stick to the track in hot conditions far better than conventional tires. Slicks stay warm all race long after that. Conventional tires are composed of many different layers of rubber and metal mesh, these layers are considered a "ply". If you have a truck with 8 ply tires, they have 8 layers of rubber and metal mesh in the tread. The higher ply, the better for hauling a load. The issue with using normal tires for racing is: One, normal tread tires are designed to grip the road to a point, but they will easily lose traction under a lot of power, especially with the amount of torque and horsepower a race car puts out. Two, normal tires aren't meant for high speeds. Slicks are meant for high speed, based on the speed rating. So at high speeds, normal tires can disintegrate.
No, Yokohama has manufacturing plants in both the US and Japan. Unless you are importing them they would have been manufactured in the US. Also, weather only really effects snow tires and other specialized tires. Snow tires will wear out quicker in warm temperatures because they have more rubber in them than normal tires.
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