My wife and I just went to ride our recently completed Calfee Tetra tandem this past weekend. In the build list we agreed with Calfee (Mike Moore), we specified 203mm rotors for the rear hydraulic disc brakes. We noticed that they built it up with 180mm rotors instead of 203mm rotors.
What are the tradeoffs between the two different sized rotors? I'm upset they built it up in a way different than what we agreed and never told me or got my approval before building it that way. They are planning to ship it out today to Portland (where I live), but I want them to change it back to the 203mm rotors we agreed upon, unless there is some really compelling reason that I should stick with 180mm rotor.