[calispec]

I did a little more research about only upgrading the front calipers.

Sti piston sizes are 40mm and 46mm area=2918.5mm^2
Sti effective rotor diameter = 268mm

Brz piston size is 42.8mm and 42.8mm area = 2877.44mm^2
Brz effective rotor diameter = 247mm

So if the piston area is more on the sti then the brake force is going to be more. And if the ED is larger you get more brake torque. So given that how does the bias move backward if you only change the front calipers?!?!?!

I have done it but I am running a higher friction pad in the rear and stock on the front right now. The bias did move back. I am getting matching pads soon so I will report back but I don't understand based on the numbers how the bias is supposed to move back.

I could have done somethin wrong so any help is appreciated.

EDIT: I can't find the post that said the bias would go back but I remember it coming from a reputable source.