A wheel size is not a single number. A full stamp such as 7Jx16H2 5/120 ET47 66.6 tells you the width and diameter of the rim, the bolt pattern, the offset and the hub bore at a glance, and every one of those five values has to be right for the wheel to fit.
Width and diameter
The first number is the rim width in inches and the second is the diameter in inches. The letter between them describes the bead seat profile, and the number after it is the diameter at the bead seat rather than at the outer lip.
Bolt pattern
Five studs on a 120 mm pitch circle is written as 5/120 or 5×120. It has to match the hub exactly. A pattern that is close but not identical will not centre, and on a car with independent suspension it will load the wheel studs unevenly.
Offset
Offset is measured in millimetres from the mounting face to the true centreline of the wheel. Positive offset pushes the wheel inboard, negative pushes it outboard. Getting this wrong causes rubbing, changes the steering feel and puts load onto the wheel bearings.
Centre bore
The centre bore has to be at least as large as the pilot bore on the hub, and usually has to match it closely so the wheel is located on the hub rather than on the studs alone.
Send us your current stamp, or your vehicle year, make and model, and we will confirm the full fitment before you order.