Are you sure it isn't about a motorcycle, instead? The guy who owns the motorcycle used to have a motorcycle club/gang, but now he's a hairdresser? I can't remember the title.
He and his uke were the second couple, and the first couple is the uke's brother and his partner, I think. They don't get along because he's a brocon or something.
The uke's brother was always getting into fights because of his delinquent brother's enemies.
Motorcycle story: http://www.mangago.zone/read-manga/shinobeba_koi/
Brother's story: http://www.mangago.zone/read-manga/nirameba_koi/
pretty sure it's the first chapter of cello mellow http://www.mangago.zone/read-manga/cello_mellow/
I search for one-shot shounen ai manga. Its about childhood friends and bicycle. One of them don't want to give their place behind his friend to some girl.
I forgot the mangaka or the title. Please, help me.. ._.