Originally Posted by
dabac
Trekking (AKA butterfly bars) usually take MTB-standard components. And there you have brake levers like the Avid Speed dial and Shimanos servo-wave(sp?) which allows you to choose between V-brake pull and Canti pull by adjusting the anchor point of the cable.
You are correct in everything but the above statement. Speed Dials and Servo-wave may have adjustments for lever feel, i.e. how much force is needed to apply the brakes, but they aren't adjustable for the different cable throw needed between linear brakes and cantilevers.