Alloy Rim 16" 16X7 New Single Alloy Wheel for Honda Civic 2016-2021 Machined

The 16 or 17 is the diameter of the rim in inches so it simply means that a 17 inch wheel's rim's diameter is 1 inch more than the 16 inch, that means that the circumference of a 17 inch rim is about 3.14 (the value of pi) inches more than that of a 16 inch wheel.