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cyyoung749, you may hear it referred to around here as a "dork disk". The purpose of the guard is to keep the chain from over shifting into the spokes by accident. As enzo24 points out, though, as long as the derailleur is adjusted properly that kind of over shifting is very unlikely to happen.

Having said that, since your disk broke as a result of your bike falling over, you can remove it and don't need to replace it, but make sure your derailleur is still properly aligned.
This is my concern: How did it break? Best guess would be the RD being slammed into it, suggesting that the hanger or RD could be bent. That'd make taking off the disc a guaranteed disaster, unless the other appropriate adjustments were made.

Likely time for a trip to the shop.
 
Mandatory things to be removed from a bike before being seen in public are:
Bells
Wheel reflectors
LBS stickers
and YES - Spoke protectors...
Some bike shops use those LBS stickers to determine if you get free/discounted service or not....
 
Won't a carbon fiber spoke protector be prone to exploding when exposed to direct sunlight?
 
After installing a friends cassette on a new wheel for him, he informed me that he wanted the plastic disc put on his bike. I had left it off. But I was more than happy to oblige after some modification.
Tough love > no love
 
lol, I must be a total noob! I had no idea there was such stigma associated with keeping the "dork disk" on or that it was even referred to as a dork disk, or what supposed purpose, aside from signaling dorkiness, that it was trying to serve.

Whew, that was a mouthful!

Okay, so got it on the dork disk, but what's so bad about the spoke reflectors? If you happen to get caught out at night, won't they serve some purpose, if you don't have a proper front and rear light?
 
Okay, so got it on the dork disk, but what's so bad about the spoke reflectors? If you happen to get caught out at night, won't they serve some purpose, if you don't have a proper front and rear light?
They throw the wheel off-balance. As speed increases so will the effect and after a certain speed is reached could actually become deangerous.

Some folks, myself included think they ruin the overall appearance of the bike. My LBS could take the DorkDisc off for me, but by law couldn't touch the reflectors - front, back and wheels. First thing I did when I got the bike home take the reflectors off.

My lights do an adequate job. I don't ride in pitch dark. If I do, I have a reflective vest just for that purpose.

If you want to keep the reflectors, if you feel safer with them on the bike rather than off, then by all means keep them. Aesthetics is one thing but personal safety is another and that is something you are personally responsible for. Do what you think is right.
 
Its so the chain wont fall into the spokes; are you sure? Hmm, I thought it was to help with aerodynamics, especially the really large ones.
You're kidding, right?
 
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