Bisbonian
Cruisin' Guzzisti
Please...
Assuming that the wheel rim and tire are both undamaged, then wheel hop is caused by one thing, improper balancing. It is quite common for the hop to become more noticeable at a particular rotational speed.
Remove the wheel and put it on a static balancing stand. I'l bet you that it has a heavy spot.
I took my front wheel off over the weekend and found a heavy spot. Adding a bit of weight seemed to solve it, at least on the balancing stand, so I'll be glad when the "hop" is gone on my next ride.