Martin Kift had suggested calipers with ever so slightly larger pistons on the front or at a push, the same size. Id guess the 164 caliper pistons were way bigger in area than the rears. Although you'd have enough effort front and back to pass iva, the braking effort and balance would be really skewed. Think Andy is one of very few who can comment on the difference, seems to back up Kifty's calcs.
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