Devil dog ! attacking motor bikes and riders !?

You're on the right track with trying to socialize her to them (but being more careful of yourself). Do you know her past? She may have had a traumatic event involving 1. I have noticed that a lot of dogs do not understand them & may even feel a bit threatened by them. My dog is very wary when going near one, but does not attack; she also barks at people in wheelchairs (how embarrassing!) but we need to think like the dog. It might be easier getting the park rules enforced regarding the bikes; you can't rush training a dog, it is however possible to overcome this with time & effort. If you don't already watch animal planet, they have some good tips; also a show called, "Its me or the dog" with Victoria Stilwell, smart woman. Good luck!