freewheel

I recently built up my new 2011 Neon Bow stock frame. I absolutley love it. A couple days ago i got home from school late and relized that i was going to be late for work. I knew that the only way to get to work in time was to ride the only bike I have right now... the Neon Bow.... I know trials...

I have a 2002 Orange Zero with Race Face North Shore XS cranks. I want to run an 18t freewheel on the rear hub, but I just found out that the smallest chainring I can fit on the crank is 24t. Would this gearing be too weird for trials? I really don't want to shell out money for new cranks and I...