Depending on the type of driving (city,highway) Depending on mileage usually around 50K When they are showing excessive wear (less than 2/32") of tread When sidewalls show wear
In the average truck that does not haul large loads the tires should be replaced every 40 thousand miles. This is the best way to ensure that your tires are giving you the best gas mileage.
It depends on the use, but yes, they have to be replaced periodically.
Yes. Not only can, but should be.
Tires should be replaced when the tread wear reaches the level at which your state no longer considers them safe usually 2/32" or when they begin to show signs of irregular tread wear or weather cracking.
On average you should rotate your tires every 6000 mile or 6 months.
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.
They are replaced when they go bad.
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.
You should rotate your tires more often.
Tires require changing after a number of kilometres covered and will be specified by the tire manufacturer. Findout from your tire dealer.
you can get a tire shop to measure the tread depth and they can let you no or if they are all cracked your tires should be rotated every 3000 miles (along with oil change). tires should be replaced if tread is less than 3/32nds of an inch deep. should not be used util tire is bald. if tires have been stored a long period of time check them for cracked rubber. Use your discretion , if unsure, ask a tire dealer. They will look at them for you and give you the best advice.
Usually every month you should do maintenance.