I just made the most significant change to my Citizen Tokyo yet! Two Primo Comet 16 x 1.35 305 steel bead tires with presta tubes. With this one low cost change I dropped 1.5 pounds from the bike. It now hits the scales at 24.05 pounds!
The really amazing thing is the decreased rolling resistance which translates into speed. The handling and stability of the bike has also increased dramatically. The speed wobble that I was experiencing on the rear wheel with the stock 16 x 1.75 305 tires (which resemble the Big Apple or Hookworm tires) has disappeared. I just did a hilly 5 mile loop and felt like I was very close to matching my road bike speeds. Flying!