I'm running 10mm's on front & 20mm's on back with my Stren ST-8 Hyper mesh II wheels. Before I mounted them I done some measuring, the OEM bolts thread into the hubs 16 to 17 mm's. Then I ordered the spacers & lug bolts so that I was staying at the OEM length. I done the same thing when I bought the wheels for my Drag Radials and I'm running a 10mm spacer with them on the back. The 1st pic is how the car looks normally, the 2nd two are with the Drag Radials w/ 10mm spacers.