I have TRP9s on my bike without the travel helpers. My left shifter is 6603 and my right shifter is 5600. It takes a little fiddling to get the brakes adjusted but once you get them dialed they work fine. The brake lever pull isn't perfect but I can still get full brake without bottoming them out. As part of dialing them in you have to play with the cable length to insure you can remove a wheel by backing the noodle adjustor off. For recreational riding I find these to be great brakes. They stop better than any of my road bikes that have DA and Ultegra based groupos.