I was thinking about getting a fixed gear, as my friend has one along with his legs of steel. I was taking a look at the Kona website and saw a couple of cool ones, namely their main one (the Unit) and another really awesome one called the Humu Humu Nuka Nuka Apu'a Deluxe. Does anyone own either of those? Any good? What's the equivalent on a normal bike (I have a 21-speed, so is it like gear 8?)?