This question is in regards to my X-treme trailmaker bike. I removed the rear wheel in order to replace the inner tube. However, I cannot seem to reinstall it properly. When I tighten the two nuts on each side of the rear wheel (pictures at https://i.stack.imgur.com/UppQK.jpg), the wheel no longer moves.
However, if the nuts are not completely tightened, the wheel falls out.
I thought the resistance may be from the disk brakes, but loosening that didn't resolve the issue. Any help would be much appreciated.