For 2013 , Specialized also offer the Demo 8 in aluminum as well in various frameset offerings and completes.
2013 Specialized Demo 8 Aluminum Frameset
The front triangle on the 2013 carbon Demo’s are made out of carbon fiber and the rear triangle is aluminum.
Specialized Demo 8 II Carbon complete
The Carbon Demo 8’s get a carbon front triangle and use an alloy rear end.
Carbon Demo Front Triangle
Specialized chose to go use aluminum in certain areas of their Carbon Demo 8 in both the head tube and bottom bracket area. This should make removal of bottom bracket cups and headsets easy and worry free.
Demo 8 carbon - Headtube
Demo 8 Carbon - Bottom Bracket - PF30
Demo 8 I Carbon complete
Carbon front triangle mates to the aluminum rear end