Freewheel, Horizontal Rear-facing Drop-outs and Rear Disc Brake

mister k what do you want a disc on the back for anyway?
you can lock the wheel up perfectly fine with a v. or if you really want more power, get some of those magura hydraulic rim brakes (pricey tho).

Magura Hydrolic rim brakes!!! It ain't 1995 you know....