I think they didn't have bikes of their own, so they would sit behind the guys. They can be seen as "property" of the members, but aren't actually considered members. It's a man's club. It's like the biker gangs here in America, I guess. Basically, if you can sit behind the leader, you also have bragging rights or at least some authority over the other girls. (That's why it's odd for Tora to be sitting behind Tetsuya, since he's a guy.)
Also, if you look closely in the backgrounds of some panels, you can see other girls behind other riders, but none of them actually are riding a bike themselves.
I'm sure there are actual biker gangs that consist of only women, but this manga isn't about one, so...
Haha, sorry about the long explanation btw, but I hope it clarifies something for you. :D
:O yeah that makes a lot more sense. I've seen pictures of female biker gangs and male ones but never mixed, I just thought that this one was one of those. -___-
I'd have a bike of my own not be some accessory bs I ain't sitting behind some dude... (lol)
thanks for the explanation :D I hadn't noticed those details!
I love the way it ended ~ (≧∀≦)
by the way, if anyone knows, did biker gangs in Japan really have the girls bitchfight over who sat at the back of the leader? It seems so shallow to me and if I was a badass biker girl I definitely wouldn't want to sit on someone's back. Were women allowed to get a bike license later than men? Is it just a plot device? What's the beef? It's not criticism towards the manga or mangaka I'm just interested if anyone knows in more detail...