I ride a redline mono cog single speed. I go in downhill races and xc races with it (special xc single speed class in Perth). Its got no gears (duh) and no suspension and its a rocket. Bit gnarly to handle on downhill runs but its light, tourquey and i can beat people with $4000 duallies. Eat my dust. Oh yeah its the ultimate urban combat bike too.

K.I.S.S - keep it simple, stupid.