I was going to run 16" wheels on my Trailhawk and needed these to clear the front calipers. I ended up not it doing that and down sized to 1" spacers. I'm guesstimating i put nywhere fron 2-3k miles on them before i took them off. If interested go to this Ebay link and check them out. http://rover.ebay.com/rover/1/711-5...29466&kwid=902099&mtid=824&kw=lg&toolid=11111