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late to party,
the abs is pretty basic. it looks for differential wheel speed. when it sees that it tries to figure out what's going on, if there's input from a lateral g sensor, it tries to steer the car in the direction of the steering angle sensor.
in the most basic sense.
when i was on my mismatched winter setup, 215 45 front and 225 55 rear. the car never did feel right or learn to be right. there was always a feeling of constant brake intervention, until dsc was off. everything seemed to activate faster than it should have. while good for winter, proactive, it wasn't any fun.
I'd say no matter what you go with for tires, keep the rolling diameters as close as possible. I don't know the % difference where braking starts taking place but I'd guess something like a 5% grace or lower.
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