Exactly. The rear dropout is part of a frame but not the front dropout -- that's part of the fork. That's why if you are only handed a frame and a tape measure and a plumb bob but no fork, you can't measure stack or reach. That's why it's kind of silly to worry about the final millimeter of stack and reach measurements -- choice of stem length and angle, choice of saddle and saddle position, choice of crank length can have much more effect on fit and comfort than a couple of mm of difference in stack and reach. Stack and reach puts you in the right ballpark, and helps you separate "tall and narrow" frames from "low and long" frames, and separate small, medium, and large frames. That all said, bikes are adjustable and people are adaptable. Enjoy your new bike.