Whats the tire presure for 16 inch tire?

Answer 1

The best way to determine tire pressure if the tires are the same size as the vehicle came with is to look at the sticker on the drivers door, if there is no sticker you can look in the owners manual or online for stock tire pressure. never fill tires to the max pressure listed on tire. Tire pressure is determined by tire size and vehicle weight to put between 5 and 7 percent of the tread on the ground. this provides the best mileage, traction and tire life. over inflating makes the tire rounder and decreases traction. under inflating reduces tire life and gas mileage.

the exception to the tire is for different size tires than the vehicle came with like off road tires or low riders. And vehicles with extra weight like a camper shell or welding bed on a pickup or towing a tailor. The extra weight flattens the tire.

The formula for changing tire sizes is as follows

example 195/55R16 to 205/55R16 old tire pressure is 35psi

The first number on a tire is its width in this case the old width is 195mm is the old tire width and 205 is the new tire width.

or calculated the second number the 55 is the percent of the width that the sidewall is tall. In this case the side wall is 55% of the width of the tire or the side walls is 107.25mm on the old tire and 112.75mm for the new tire.

the third number is rim size in this case 16 inches

to convert rim size to mm multiply 25.4 and that equals 406.4

now multiply the side wall times 2(once for the top and once for the bottom) and add rim and we get 620.9mm for the old tire and 631.9mm these are the diameters of the old and new tires

(old pressure divided by (new tire diametermultiplied by pi)times new tire width)multiplied by ((old tire diameter multiplied by 3.14) multiplied by old tire width)) = new pressure

(((631.9mm x 3.14)x112.75mm)/35psi) x ((620.9mm x 3.14) x 107.25) = new psi

((35/(1984.166 x 112.75)) x (1949.626 x 107.25) = new psi

(35/223696) x 209097.3885 = 32.71psi