It really depends on what kind of car and tires you have. Your owners manual should have a suggestion in it. The average time would be 2-3 years or every 50,000 miles. But then again it definitely varies on the car and tire brand.
Hope this helped!
I change my engine oil and filter every 3K, transmission fluid and filter every 35K and rotate the tires every third oil change (9K).
Your local yellow pages would be a good place to start. Most automotive repair shops would be able to change tires. Specialized tire retailers would also change tires. You might even check with some of the large discount stores in your area because they often sell and install tires.
Tires should be checked frequently to look for deflation or wear. A good rule of thumb is to check the tires whenever you change the oil in your car. You should check the pressure and the depth of the tread.
Rims and tires should be changed yearly to keep them in best performance and avoid safety issues. Your local garage will probably do this for you cheaply.
so that less friction is caused, and to improve speed
You change tires when they are worn out, not at a set mileage.
Only if you feel vibration at speed, or if you get a tire plugged or patched. Naturally, when you change tires
Flat tires is a sign of physical change. The tires go from being normal, to then being flat. This changes their physical form.
Someone is joking with you , there is no such thing as blinker fluid and the air in your tires doesn't have to be changed , just the correct tire inflation pressure should be maintained
The rim size must match the tires unless you also change the rims to match the tires.
How to Change the Tires on Self-Propelled lawn Mower
It depends on how old your tires are and how warn they are. The front tires will wear out first, so if they replace your tires regularly then you can get away with only replacing the front two. If you rotate your tires when you change your oil or don't replace your tires often enough then you will probably want to replace all four at the same time.