ok, the crankarms dosent have a name, but the pedals were shimano, and everything else, so I guess its a shimano. It clicks in all the gears, and out of the saddle. Cant be a broken weld, would of noticed it aready. Tommorw me and my friend is going to take the whole thing apart, look at every bearing, and pack it with grease. If thats not it. . I dont know what to think