Women race against men all the time in the States, at least in New York. And yes, you can comment on track size but the women I have seen race and have spoken to were not worried in the slightest about racing blokes. It's not a physical one on one combat sport. Bike control and riding ability counts. I admit in the top leagues/GP level, elbows on corner 1 are important. Personally I think it would be great to open up the National league (d3) to women in teams. If they want to race, let 'em.