The eccentric part of this hub didn't work for my needs, So I changed it out with the standard single speed innards. It's just the eccentric axle, the two axle ends and the two sealed bearings that I'm selling. You need to have the ENO hub itself. The innards are extremely easy to change out; White Industries has a PDF download on their website. Actual photos of what I'm selling on request. Used about 10 miles. $45 shipped conus. Thank you.