All About Wheels - FWD, AWD Volvo
Great videos, writing and diagrams, like this:
Bolt Pattern or Bolt Circle
The bolt pattern or bolt circle is the diameter of an imaginary circle formed by the centers of the wheel lugs. Most Volvos* use a bolt pattern of 5 on 4.25 inch (108mm). This indicates a 5-lug pattern on a 4.25 inch circle, which is pretty much unique to Volvo. A few other cars use this bolt pattern, such as Ferraris and some Fords, but in most cases the offset is different enough to prevent the use of any wheels not built specifically for use on a Volvo.
