Can be done on or off of the vehicle. You will need to source an appropriate sized rotor for your application or drill out your 4x100 rotors.
Matco Tools SP102 Specialty Dash Knob Nut Trim Tool VW Similar To Mac To S193
5x100-5x120 Wheel Offset Measuring Tool for Universal Fitment Simulator New
Wheel Pattern Measuring Tool for 5x100 5x105 5x108 Fitment Simulator
Hub Offset Measuring Tool for 5x100-5x120 Wheel Pattern Fitment Simulator
4-Lug Wheel Bolt Circle Tool for 4x98 4x100 4x108 4x110 4x114.3 4x130
Hunter 175-492-2 Flange adapter 4x98 mm, 4x100 mm, 4x4", 4x4.25", 4x110 mm