The best place to find this information is in your owner's manual or on the vehicle itself. There should be a sticker on the driver's door or on the body of the vehicle when you open the driver's door that will give you this information.
Do not go by what's printed on the tire. This is the tire manufacturer's recommendation and it may not be what is recommended for your particular vehicle. Good luck.
〉 Answered on Jul 29th, 2007 by Lori Johnson, Owner and Instructor at Ladies Start Your Engines