If you're looking for anime similar to Air Gear, you might like these titles. All recommendations are made by Anime-Planet users like you!
Ippo Makunouchi is a loser. He has no friends, he spends his free time helping his mom with work, and he's constantly being beaten up by bullies. But that all changes when one day he's saved from another beating by Takamura, an up-and-coming boxer. Soon, Ippo turns his life around with a passion for the newly discovered sport, but his new lifestyle is far from easy! Before he can even dream of becoming champion, he'll have to overcome a slew of fierce rivals and learn what 'dedication' really means.
Both are about the development of, in Hajime no Ippo's case, a weak kid who is bullied and then matures, while Air Gear is about a kid named, Ikki and his gang who challenges other gangs to become the top, and eventually king. There is more fan service in Air Gear, although both have equal amounts of comedic scences to balance out the serious "fight/battle" scences.