As a commitment to my own health and well-being, I have decided to participate in a local duathlon that takes place next May. Since I am strapped for cash and only just a newbie to the sport, I will be using my mtb (2005 Gary Fisher Tassajara) for the cycling portion. I have outfitted it with 1.5 slicks, swapped the pedals for some clipless pedals, and swapped the riser bar out for a sturdy aluminum flat bar and added bar ends and some short aero bars (Cinelli Spinaci). My question(s) are, what else can I do to make this bicycle at least a little bit more road specific? I have considered swapping the fork out for a rigid fork and will probably do that anyway. Would it be possible to fit a cyclocross crankset to this bike? If so, would this require a new derailleur and/or bottom bracket? Also, would it be beneficial to swap the current 11-34 cassette to something like an 11-25? I'm not currently to concerned about weight of the machine. Thanks!