It has a bmx rear end. BMX and disc brakes don't exactly go together. Besides, years of trials riding has made me appreciate the accuracy and control you get riding street with a v-brake on the rear. If you don't appreciate it, don't comment. In fact, if you're not interested in purchasing it, don't comment.

 perfect set up

 dude he has a V BRAKE on it. thtas not a good set up........