You want the correct tire size that was engineered for your car. You can find the correct size in your owner's manual, or on a sticker somewhere on your car. They put the stickers in different places on different cars. They are most commonly put on the door of the glove box, or on the door frame of the drivers door or the passenger door.
All My Best,
〉 Answered on Jul 20th, 2007 by Amy Mattinat, Owner and Author at Auto Craftsmen Ltd