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  1. It’s a safety feature that’s meant to prevent your chain from getting jammed between the spokes and the cassette in case the derailleur malfunctions, which could lock the rear wheel up and cause you to crash.

    Many people advocate removing it because they think it looks silly and the risk is minor.

  2. Waste-Evidence5837 on

    Some refer to that as the dork disk. It is designed to protect the spokes from the chain if an over shift occurs. If the limits are set right, then it is not needed. I remove it from all my bikes.

  3. There are two major schools of thought on this issue:

    – on the one hand there are those calling it “spoke protector”, who leave it on to protect the spokes in case the chain jumps off the big cog,

    – on the other hand you have those calling it “dork disk”, who take it off, reasoning that if you set your derailleur properly, there’s no way the chain can get to the spokes.

    I took it off my bike, but left it on my daughter’s bike.

  4. Healthy_Article_2237 on

    I leave them on beginners bikes. We are now at the point where most bikes we buy are built from the ground up though.

  5. Critical-Preference3 on

    Leave it. It’s to protect your spokes. Crashes happen, and it’s not uncommon for derailleur hangers to get bent as a result. Who cares what other people think.

  6. It’s great when it’s already damaged / bent on a new bike and you have to take it off ๐Ÿ˜…๐Ÿ˜…๐Ÿ˜…

  7. Nowadays itโ€™s becoming cool to leave it on. Iโ€™ve always left mine on, but Iโ€™ve always been ahead of the pack when it comes to being cool.

  8. No leave it itโ€™s functional it keeps your chain from going past last sprocket and getting jammed between spokes and last gear

  9. Bike mechanic and I only take it off if the derailleur is of decent quality. I’m not trusting no Microshift trash or Shimano Tourney derailleur not to flex past its limits into the spokes.

  10. catchy_phrase76 on

    Its called a dork disc. Long as the B screw is set, you don’t need it.

    Even if the chain does get there, the tests on youtube show it provides limited protection.

  11. I’ve had them spare wheels after a minor crash that tweaked the der, so yes, they work and that makes them worth leaving on. Once it breaks and I have to change the cassette I don’t bother reinstalling them and I never put them on new wheel builds, but having it there isn’t worth the energy to remove and it might end up mattering to you.

  12. Itโ€™s only useful if the derailleur isnโ€™t set up correctly; which it should be so remove it. If it isnโ€™t setup correctly, change that then remove it

  13. No, I leave it on. But I don’t go out of my way to add one if I’m using a wheel for the first time. I will remove it if it’s discolored and starting to fall apart, which, they eventually do.

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