Just as the title says, I have 19" Ruff Racing 278's and I want to know if the CTS-V calpiers (front and rear) will be compatible. As you can see.... I need bigger brakes... Thanks!

 

If you have a 35mm offset like me then you'll be fine, if not IDK.

I also reccommend you check out the sticky on this very subject.

Q. Will my current rims fit?

A. That depends on several factors. First of all you will usually need an 18 inch or larger diameter rim to prevent the inside of the hoop from touching the caliper.
The second aspect concerns spoke clearance. This is where you get lots of different variables based of the shape of the spokes as well as the rim width and offset. If the spokes touch the caliper then you will need to space the rim outward. The easiest way to see if you will need a spacer or adapter is to measure your stock brake setup (12" LS1 rotor and caliper) and see if you have at least 1 1/4" of spoke clearance. Once you take into consideration the new rotor offset and the new caliper thickness, the conversion will stick out 1" more than stock.