Originally Posted by
Dudelsack
half-wheeling rider in front's back wheel is roughly parallel to rider in back's front wheel. Dangerous to the guy in back and rude if the guy in front is doing it on a recreational or club ride. Don't ever be a half-wheeler.
I just call that "overlapping wheels." Dangerous, yes. "Halfwheeling" to me is when riding alongside someone and you put your front axle even with the front of their front wheel. There's no draft benefit; all it does is encourages them to subconsciously speed up to get even with you. Someone doing that can screw up a whole group.