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If you're having to put air in your tires frequently then your tires probably need replacing. Also if the tread on the tires is worn down they should be replaced (a symptom of worn tread is the tires squealing on the road for no apparent reason).
Yes, you can for tubeless tires because the valve stem attaches to the wheel. Auto shops do this frequently when changing a tire for a new one. Tires with tubes can be repaired if not damaged to severely. Otherwise the entire tube is replaced.
Yes, they can
Yes, they can
It depends on the use, but yes, they have to be replaced periodically.
Yes. Not only can, but should be.
Yes, if you also change wheels.
Yes. can i install traditional tires on run-flat rims?
a group of airliners is called a fleet.
Tires have molded indicators called "wear bars." If these are visible across the tread pattern, your tires need to be replaced.
no
First you should use a search with the term tires. Secondly research some of the manufactures such as Firestone and Goodyear. I have had my tires replaced at Tires Plus and would highly recommend it.