There have been many attempts to create a lightweight commuter bike, but few have come close to Germany’s PG-Bikes BlackBraid Fixed. At just 11 pounds it is about as light as they come. This bike features a carbon fiber frame, belt drive and includes just a front brake.
One’s wallets might be a whole lot lighter to ride it however, as this bike reportedly costs around $20,000. Apparently you can put a price on less weight.