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Old 06-15-09, 04:56 PM   #1
swflacpa
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Plastic disk between cassette and spokes

What is the plastic disk between cassette and spokes called? Is it a required component? Mine has become gummy and nasty and I would like to remove it.
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Old 06-15-09, 05:02 PM   #2
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It's known as a dork disc, a pie plate, or a spoke protector. If your rear derailleur inner limit screw is properly adjusted, you don't need it. The proper way to get it off is to take the wheel out and remove the cassette (you'll need a chain whip, the appropriate cassette tool, and a wrench or vice grip to hold the cassette tool).

Or you can just hack it off with pruning shears, the way I did before I got the proper tools mentioned above.
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Old 06-15-09, 05:09 PM   #3
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It's known as a dork disc, a pie plate, or a spoke protector. If your rear derailleur inner limit screw is properly adjusted, you don't need it. The proper way to get it off is to take the wheel out and remove the cassette (you'll need a chain whip, the appropriate cassette tool, and a wrench or vice grip to hold the cassette tool).

Or you can just hack it off with pruning shears, the way I did before I got the proper tools mentioned above.
Thanks - I've been wanting to get rid of that thing for a while now
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Old 06-15-09, 05:49 PM   #4
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lol, dork disc.

+1 to caloso.
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Old 06-15-09, 08:09 PM   #5
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If your rear derailleur is improperly adjusted and you don't have that disc, when shifting to the largest cog, the chain will go up and over the gear and into the spokes.
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Old 06-15-09, 08:22 PM   #6
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Okay, you said if your derailleur is adjusted properly it isn't necessary, well, even if it is off and you have the dork disc, it will work its way over and into the spokes anyways. Murphy's law.
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Old 06-15-09, 08:28 PM   #7
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I'd rather have a dork disc than have the chain tear out my spokes in the middle of traffic. Granted, you're probably going slow when this would become a problem, but it could be an expensive problem and still possibly dangerous. My derailleur is properly adjusted and I check it routinely. But I still keep the dork disc in place. But to each their own, if you're more concerned about what some elitist Fred may think about you rather than getting yourself mangled, by all means, take it off.

"it's an imperfect world, screws fall out all the time"
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Old 06-15-09, 08:49 PM   #8
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^ it will not keep your chain from going into the spokes. It just makes an annoying noise, then does it anyways.
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Old 06-15-09, 08:57 PM   #9
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You should also check your derailleur-hanger's alignment - or have a bike-shop check it and put it in good order if it's off. This will help cut down the possible odds of your chain and/or derailleur ending up in the spokes.
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Old 06-15-09, 09:11 PM   #10
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Mine got chewed up and then started click-click-click against the spokes one day when I was a few miles out from home. I pulled out the multitool and stabbed it with the flathead screwdriver in a line, then tore it off. I wanted to throw it down in a huff, but I try to take my garbage home, so I folded it up and stuck it in the seat bag.

Stupid dork disc. Who thought soft nylon was a good idea?
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Old 06-15-09, 09:57 PM   #11
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Whatever you do, don't try to burn it off: I set my rear wheel on fire

I love that thread.
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Old 06-15-09, 11:05 PM   #12
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Whatever you do, don't try to burn it off: I set my rear wheel on fire

I love that thread.

Thanks for that link. Made my lunchtime.
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Old 06-16-09, 01:00 AM   #13
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Ph00ls! The american government has made it quite clear that these life-saving devices should be mandatory on all bikes!

I distinctly remember reading a CPSC recall order that said something like "there is no dork disc on such bike model, please return to the bike dealer to have one installed at once!"
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