No that was the hub spacer I picked up after putting the tire down, it's a durablue axle we never found the castle nut. I used a keychain bent to work like a cotter pin to hold the wheel on to limp the 3 or 4 miles back to camp. Went to autozone that night (only thing open) got a bunch of cotter pins and a nut as close to the castle nut as we could get so my bro could ride that night and the next day.