What are the benefits of using a chain guard on my road bike, and why do so many roadies seem to consider them a necessary evil, yet simultaneously view them as a fashion faux pas that screams Im a novice who doesnt know how to properly dress my bike? I mean, come on, if a chain guard can prevent a nasty chainring scar or a destroyed pair of shoes, isnt it worth a little extra weight and a perceived loss of style points? And lets get real, who actually enjoys the feeling of chain grease on their pants leg or the sound of a chain slapping against their frame? Im not buying the whole its a road bike, it doesnt need a chain guard argument - cant a chain guard just be a practical solution to a common problem, rather than a symbol of a riders perceived lack of cool? Are there any actual performance benefits to running a chain guard, or is it just a matter of personal preference (or lack thereof)?