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Yes, bore diameter is sorta a determining factor. It not so much bore diameter but total piston area. Thats only one part of the overall factor that determins natual bias (uneffect by proportioning valve or base bias below the knee point of the valve). Effective rotor diameter is also a major factor in the natural bias.
MR2's have larger diameter rear rotors for the reason of increasing rear bias.
The third factor is the Pad Cf (coeficient of friction). This can also have a significant effect on the bias. One factor that has to be added in when dealing with pad Cf changes is the operation temps of that particular wheel / axle... Manufactures use differnent pad materials between the front and rear cause of temp differances. Fronts run hotter then the rears so they try to use a materials that have the same Cf at the different temps but with a linier change to each other cause all pad materials change with temp change. They also select materials that are best in the typical opperating range for the designed intended use.. That part is very improtant.... Try stopping a car with a Carbon / Carbon pad / rotor set up when its cold and your gonna hit what ever is infront of you. They dont work for sh!t below 500*... This is why you'll tend to notice some HIGH end (like GT1, LMP, and F1 cars) riding the brakes right before going green on a full coarse caution, its to get them heated up so they can slow down going into turn 1 etc.....
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