It's a fixed gear. Is that all you're gonna need ? Can you say "stripped rear hub threads ?" Maybe a chain whip for the cog and a lockring wrench ? Also, how about a spoke wrench to true and tension the badly built stock wheels ? Maybe a chain tool ? And can you properly tighten the cranks bolts with a small allen wrench ? How are you going to shorten the brake cable housing and cable to fit properly, because they come uncut from the factory ? Are you going to leave the steerer tube uncut as a big erection, or butcher it with a hacksaw ? Fact is, your gonna need to spend at least $100 initially to properly build, adjust and maintain even a simple FG bike. And even then, you will probably screw some things up badly that you can't undo afterwards.