I have 1.5" (wheel spacers) on my 14 GMC Sierra 20" OEM wheels, 2.5" flat front and 3" blocks rear, only has a small amount of wheel pinch and adds an aggressive look (I have a TOYO RT 305x55x20 on OEM rims), very little wear at full rotation, front locking, have driven them about 1500 miles so far they are Well