Cyclist attacked

What defensive/self protection measures are legal here? I'm a Yank, so it's an honest question. I carry my D-lock on my waist but I'm not entirely confident in using that against a group and I'm more interested in something for my wife to carry when she rides.

fellow yank here as well. and to answer your question, fuck all. there is nothing you can carry legally here for self defense. its an absolute joke.