My new-to-me Trek 520 came with the factory V-brakes and non-factory Tiagra STI brake/shifters. From what I understand the V-brakes need more cable pull than these levers can muster. Indeed, pulling the levers to the drop bars is quite easy and the brakes clearly aren't squeezed all the way.
Can I just replace the V-brakes with cantilevers, like the Tektro CR720? I was also looking at the Origin8 Pro Force brakes. I do need to clear the fenders. Thanks!