Originally Posted by tigweld
with assist it's not nearly as important to match piston sized correctly as with manual u will probably notice little difference in any of those different apps. I'd probably run the one with the smallest bore to get max pressure possible with big tires you wouldn't notice if it is a little touchy. btw I have always found a good feeling brake pedal is more in the leverage delivered by pedal design than matching caliper piston to mc bore. I always seem to notice more difference in changing the pedal ratio.