Corben -
Zycle Fix seems to have a few different frames, and all but their geared road bikes have hi-tensile steel frames - perhaps called 'carbon steel' by someone your friend spoke to.
Does the bike have derailleurs? Because then it is almost definitely aluminum. If it is a fixie then it is steel.
Edit:
Also, none of their bikes come with carbon forks, so the ones with canti braze ons was likely added by the original owner.
Last edited by Wilfred Laurier; 01-04-15 at 03:55 PM.