I ordered a test wheel to check fitment before ordering all 4. I did this because when looking at my existing wheels it looked like a staggered offset from front to back would allow me to fit some bigger rubber at the back and fill out the guards better. The wheel I ordered was a Performance Superlite 15 inch x 7 inch wide. The test wheel was P14 offset and was fitted with a 195/50 Michelin Pilot Sport. When fit up the front looks perfect so I ordered another one the same. On the back that offset had about 10mm clearance to the guards and at least 20mm to the springs and inner guard. To better centre the back two wheels were ordered in P24. The second test was fitting up a 225/45 Hancock RS4. This wheel comes in both 195 and 225. I was a bit apprehensive about it fitting but it seemed to fit up well. It was a tight fit to the guard but still had plenty of clearance on the inside. My car is sprung pretty tightly in the rear so it shouldn’t rub (fingers crossed).