Not a lot to go on - had some sort of blue cover on the seat and either blue colour or blue tape around the top frame.
Was in Surry Hills. Guy was up to no good - have the numberplate of the guy's mate he was talking with - I somehow suspect it is a stolen bike going off his behaviour.
Details up on reddit:
http://www.reddit.com/r/sydney/comments ... _mountain/
Crappy pictures from across the road here:
Black frame, white writing. Black fox shocks on the front. Seat was covered with plastic? Blue coloured top bar (might have been covered). Custom looking handgrips - might have been alloy - think they were gold-ish?