it's at least a good inch, I had to do this with the 3" PCS extension setup with the Kury swingwings, I only have about 1/2" left on each end so I carry an extra couple of nuts (no pun intended) just in case it comes apart, I find myself worrying about it and I check to make sure the nuts are tight every time before I ride, I really should just get some different pegs but dam I love to throw my heels up on the swingwings