I've been looking at some CX bikes lately, not for racing or riding off road but for regular road riding. While shopping, would I expect to be on the same size bike as if I were shopping for a regular road bike? That is, if I normally ride a 53cm road bike, would a 53cm CX bike be right? I know one typically rides an MTB a size or two smaller, for quicker dismount reasons; but the rest of the bike is sized to "fit right". Are CX bikes done in a similar fashion?