Because constant use wears the rubber away from the treads.
Tires are a wear item just as brakes are. They will wear from friction. Properly inflated they should wear evenly. PSI inflation should be checked regularly. If they are not wearing evenly the vehicle may need an alignment.
Many European cars use 14 inch tires.
no unless you have parts that need replacement
Fulda Quantum Elite Tires are made in many sizes. You need to determine the size of a cars rims, and the clearance available to determine what cars the tires will fit.
Michelin is a company that sells many different types of tires, so you should be able to easily order the tires you need. Otherwise, you can purchase Goodyear tires, which also have a good reputation.
It needs air to hold the tire so it can roll.
http://www.expresstire.com/general_car_tire_faqs.shtmlwill tell you all you need to know. Though if your tires are damaged you should probably get them replaced.
Yes, cars need friction between their tires and the road surface to accelerate, decelerate, and turn. Without friction, the tires would not be able to grip the road, leading to the car sliding or skidding uncontrollably.
Yes. Most new cars need a servicing every 5000 miles and a major service at regular intervals. Tires also need to be rotated on a regular basis. Cars are expensive investments.
so that less friction is caused, and to improve speed
That number is NOT a proper tire size ! -You need to check it and post again .
When you need to find truck tires for sale, l would recommend the comparison sites like ebay and amazon. Many wholesale tires companies use them, and customer feedback is useful in helping you to decide which would be the best truck tires for you.