I personally find that the Speed Dial helps to adjust the levers to some extent do support both, cantilever and v-brakes.
here is a bit of history on the Avid levers
Afternoon all. Is there a quick and easy way to tell if a set of Avid Speed Dial brake levers are designed for cantilever or V-Brake? Must be possible from the model number? Lots of different versions out there. I'm looking for a set of canti levers for a build, and Avids are a possibility...
www.retrobike.co.uk
To my knowledge, the Ultimate had been originally designed for Cantilevers.
They got later a different internal chip to be able to support V-Brakes, a picture of this chips is at this post
I have two sets of avid arch supreme vbrakes, each set came whit a different set of levers: The first set is what i think is a 1998 set of SD ultimate V, seams like four finger levers. the second set is Avid ultimate from 1999 or 2000 (Really the same lever as my 2011 Ultimate black obs.)...
www.retrobike.co.uk
The SD2.0 without "L" had been to my knowledge designed still for cantis.
We have recently discovered that also certain bikes like the
96 Barracuda AL750 had been officially equipped with those 2.0 levers in combination with Onza HO cantilevers.
The ones with "L" than for V-Brakes.