Just one thing i noticed in case someone else runs into this problem is that when I pushed alt_G to move the back wheel to the center of the world, I had my transform set to local which caused the wheel to move to the center on the Z and Y axis but not the X axis. I resolved this by setting transform to global before pushing alt_G, I noticed yours was in local when you did it and there was no problem, not sure what the difference is.
