What would be the disadvantages to using these?

 

they move the wheel up higher in the wheelwell which can limit the width of the tires you can use and not have interference with the body work which can limit how far you can turn the wheels without the tire rubbing on something. you can change the wheel offset some to minimize this, but it puts the tire/wheel farther out toward the fenderwell too, so you have to be careful no matter which way you go.

 

Thanks. I thought these would be a good alternative to getting lowering springs because the steering geometry isn't affected with the spindles.