I have the bars in my sig but i was wondering what the difference is between the different sizes for the REAR sway bar. Please respond

 

The size of the rear bar (compared to the front) help to determine the amount of understeer/oversteer your car has. With your bars, yours leans more toward oversteer than most. I use the 35mm in front with a 21mm rear. I do have different springs which factors in but you'll find that most people that autocross use either the 19mm or 21mm bars in the rear. The thought is that if you go too large in the rear, it's more difficult to put the power down when exiting corners. I've never used the 25mm bar so I can't speak from personal experience but simply passing on what others have said.

 

I have the 25mm rear. It is very tough to put down power exiting a tight corner. He's right.

 

We're EVERYWHERE!!!!!

I haven't been up here in ages. Forgot what this forum looked like!!!

 

I use a 24mm bar in the rear, but that's only because I have 90lb linear rear springs (weight jack setup). The extra-thick bar basically gives me some more rate that the springs lack. If you don't have an odd spring combo like I do, stick to the 19mm or 21mm bars.