Originally Posted by veganbikes

All of the calipers cyccommute listed are long pull which would generally be found on a mountain bike. The Paul Klamper is adjustable with different arms so you can use it for Short, Long or Campy pull and the BB7 has a mountain variety (the wrong one was linked initially) but like you see they have a road variant as well and the Spyke is mountain only, if you ever wanted road that is the Spyre.

For dual piston that would be the Spyke but Paul says their Klamper is better because it is a single piston design and trying to do two pistons would make a really huge brake. I can see what he is saying and I do generally love Paul components and use a bunch of them on different bikes but I am not sure if the single piston is better than the dual piston of the Spyre/Spyke but maybe one day I might get to try the Klampers long term.