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    The spoke guard is there so that when your misadjusted/maltreated rear derailer shifts the chain off the top sprocket it doesn't jam in the spokes. This is the difference between being simply annoyed and being thrown off the bike (and possibly damaging the wheel). Commented Mar 1, 2014 at 19:02
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    @Daniel: If only I had known to search for "spoke guard". On the other hand if I'd have known that I'd not have had to ask the question :) Commented Mar 3, 2014 at 8:01
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    I'm convince that its real purpose is to work itself loose and then to rattle around clunkily until it drives you nuts.
    – RoboKaren
    Commented Sep 19, 2014 at 16:11
  • The plastic ones like to deform and start rubbing on the derailleur too... Commented Nov 17, 2018 at 18:43
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    The colloquial term is 'dork disk', which indicates how a lot of bikers view them. Commented Jun 6, 2019 at 14:00