The stock tire size for a Nissan Altima depends on the year and model of the car. Typical stock tire size for a Nissan Altima manufactured since 2005 is 16 to 18 inches.
The original 1993 Nissan Altima had 15-inch stock tires. Through the rest of the 1990s and into 2001, the stock size fluctuates between 15 and 16 inches. From 2002 until 2015, the stock tire size can range from 16 to 18 inches depending on the specific type of Nissan Altima.
An alphanumeric code often appears somewhere on the tire itself. It is typically eight characters long and has a slash between the first three and last five characters. The last two characters often correspond to the size of the tire. For example, for a tire marked 215/60R16, the last two characters are 16; therefore, the size of the tire is 16 inches.