This is the most basic measurement on a wheel.
Simply, wheel diameter is the height of the wheel.
Late Model vehicles don’t generally see smaller than 14? and can go as high as 20? from the factory.
Aftermarket wheels generally are going to be larger in diameter than their factory counterparts.
Offset alone is useless.
The combination of wheel diameter, wheel width, offset and disk/face is needed to know fitment.
Offset is the distance between the centerline of the wheel and the hub mounting face.
This distance dictates the wheel’s placement within the wheel well. Offsets are described in three different ways, Positive, Zero and Negative.