It seems, that most of the people here just simply don't get it.
This manga is enjoyable, crazy, surprisingly smart for shounen and of course exciting ride, from beginning to the end, you just have to be prepared, that plot will get you in a totally different direction from where it seems to be going at first. People are scared of unexpected story twists, dialogues, where you have to pay a tiny bit of attention, and overwhelming awesomeness. The whole concept didn't make any sense from the beginning (roller blades with engines, really?), neither did "superpowers" that were introduced a little bit later, but Ito was doing a great job tying it all to his masterfully crafted universe using pseudo-scientific explanations. Don't get humble first parts of the story fool you, this manga is gurren-lagann-level-nuts. But it has its own poetry feel to the narrative, dialogues filled with beautiful metaphors, which are sometimes translated into incredible art, philosophies, which are ,for once, not empty, and characters that feel really alive. It's about awesomness, Dreams, love, FEELS, epic, finding one's way in life, rivalry, and many other great things. It has really funny jokes, as well as most exciting, most well-thought and most unpredictable battles in history of manga. That battle with Sleipnir you'll never forget. Oh yeah and also some ecchi, but i stopped noticing it after a while. You just have to follow carefully, and even use your brain from time to time to comprehend what's going on, otherwise you might get pretty confused.
And who the hell cares about what happened to Ikki's crow, whether he got expelled from school and how obama-girl got switched back? Someone here was wondering what happened to Ikki's parents, well it's actually was all explained in the manga, like i said, you just had to pay attention. Anime sucks balls, btw.
Bottom line is, Air Gear is one of the greatest and most beautiful mangas out there , both story-wise and art-wise, but it also a little bit demanding, you have to read it carefully. So fasten your seatbelt, and ready for the craziest ride (or is it better to say flight?) of your life, you won't regret it, trust me.