This thru axle is for attaching an Old Man Mountain rack to the rear of a fat bike that has a 12 mm thru axle with 1.5 mm thread pitch and 229 mm or 223 mm length. We partner with The Robert Axle Project to supply our thru axles.
  • Diameter of thru axle is 12 mm.
  • Thread pitch is 1.5 mm.
  • True length of axle is 229 mm, but can be shortened to 223 mm with the included spacer.