I've heard that some of the cheaper aftermarket bearing are real junk...but even still they shouldnt be wearing out that fast unless you have some really huge and sticking out offset wheels on the car that are putting a lot of stress on them...if thats not the case then double check the install process to see if its seated well and tight enough (torque to spec)...from the concensus on the board, Timken is the bearing/hub of choice.