http://www.hubjub.co.uk/gorilla/hattara.htm - gorilla frame
http://www.hubjub.co.uk/eai/eaibk.htm - eai frame
Are these bikes made by the same people? It looks like the came from the same country at the very least. On the site I linked to there is only a £ 25 difference. The fork lugs look identical. Ditto on the drop outs, rear brake stay, the tubing ect. The bareknuckle might be a bit bigger tubing but not sure, perhaps making it more similar to the Zengang Gorilla frame. The biggest differences appear to be the fork steering tube diameter and the clearances size for tires.