The bikes are, (clockwise from top left) Honda CBR1100XX and Honda CB750F from http://www.honda.co.jp/WebPlamo/ (after some assembly) and the bottom bike is called the Zeta bike from BioMechanix many many moons ago (it's here too, http://www.turbosquid.com/3d-models/3d-motorcycles-sports-model/156067 but f**k me it didn't cost that!!!!).