I'm in the situation of removing the rear wheel to replace my rear sprocket and grease the hub. My bike is a 99 CR125. Also when I spin the rear tire, I hear a metallic screaching sound, does that mean my rear brake pads are worn out? OK, back to the real wheel removal, I already have the lock nut removed on the right side and the square thingy that holds it in place. Anyone shed some light on how to remove the wheel? Thanks!