I have a bike like that which I use to get around campus. I use this one just in case someone feels the need to steal my bike or walk by and destroy the wheels. I am not saying that it is the smartest thing to do but it's not as bad a most people think. If you posses any riding/scanning skills and a little common sense it's not bad. I don't skid a whole lot so there isn't really a problem with worrying about unscrewing the cog. I rotafixed it on the hub pretty tight and have skidded, just playing around in the parking lot, by hooking the front foot under the platform. In the two years that I have had this particular bike I have lost control of the pedals 3 or 4 times but not around any traffic and the only reason it did happen was because I was spinning as fast as I could and I forgot to keep pedaling.