Exactly what I was thinking, mariano. Also, perhaps it has to do with a pant having to legs and a fork having two legs. I broke my FORK. I have dirt JUMPERS On it (2 legs). Thus, I can also ride with 1 leg of the fork and say I have a DIRT JUMPER on it. I can impress my friends, verbally, by snagging a fork that got cut in half by a reckless dirt jumper. I have a "lefty" on my bike. Not "I have lefties, on my bike".