Not necessarily, no. The fit of a cyclocross bike is going to be a tad different than that from a road bike. Typically, you ride in a slightly more relaxed posture on a CX frame, as opposed to a very "efficient" tuck on a road bike, though a CX frame is extremely flexible in allowing you to configure your components in order to chose your riding position. My experience has been that the size of a CX frame correlates well to that of a road bike. I ride a 56cm in both frames. I tried various CX frames in 55cm, but they felt small and off balance to my body built for any spirited riding.
Last edited by WolfsBane; 07-09-12 at 07:18 AM.