Cyclocross - cyclocross race bike specifications

What are the rules to the bike specifications? can u race any thing?

Is taking a cross crash better/worse then road? For a beginning racer, which is easier between road and crosS?

I think you can race just about anything, depending on the organization putting on the race. You probably don't want to race a Giant Faith, but if you have a hardtail, it'll work. If you have a road bike, you'll want to figure our if you have clearance for some beefier tires as they are the most important difference IMHO.

cross crash = no big deal. get up, keep going.
road crash = maybe a big deal, maybe not, but your race is over most likely

you can't get dropped in a cross race, you just finish DFL. On the road, if you get dropped your race is basically over. Therefore cross = easier for a beginner.

Locally for me (Portland, OR area) the major cyclcross series is open to any bike, and especially in the beginner level you see pretty much anything. Plenty of hardtail mtn bikes, some FS stuff, road and touring bikes with as much knobby tire as will fit, "real" cyclocross bikes, there was even one guy in beginner class last year on a BMX bike.

Unicycles run in their own class though :)

And, like kudude said, crashing in cross is no big deal (on most of the course anyway), just try to scramble out of the way.

Try it, you'll like it.

crashing in a cross race vs road race is like comparing a pillow fight with little girls to boxing with mike tyson.