Do you need plastic guard on cassette?
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  1. #1
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    Do you need plastic guard on cassette?

    My bike fell on the ground and plastic guard on cassette got cracked apart. It didnt just competely came off but some of the parts came off and most of the parts are still hanging on cassette. Evertime I pedals plastic guard also moves and makes weird sound. Can I take this plastic guard off or Should I install a new plastic guard? Is it important to have plastic guard? Thank you

  2. #2
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    The plastic guard serves an extremely important purpose!




    To keep someone from suing the bike company. Same as the little tabs on your fork that prevent you from using a quick release, wheel reflectors that cause massive vibrations at any kind of speed, etc. There's already a device to prevent your chain from going into your spokes, it's called a limit screw.

  3. #3
    Captain Obvious
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    upgrade to a carbon fiber one.
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    Just go with a solid rear wheel. The cool factor would be over the top...

  5. #5
    Fred the Clydesdale
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    The plastic disk is lovingly referred to as a "dork disk." It may be removed without harming you bike in the least.

    I am more concerned about the rest of your bike. That had to be a pretty hard knock to break that disk.

    Did you check the whole thing over? Wheels true? bolts/nuts tight? Lose anything important?
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  6. #6
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    Quote Originally Posted by tomk96 View Post
    upgrade to a carbon fiber one.
    where do you find those? Link?
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  7. #7
    What the what???
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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.
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  8. #8
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    Quote Originally Posted by tomk96 View Post
    upgrade to a carbon fiber one.
    I say paint it metallic gray and cut teeth into it, that way it will look like you have a 40-tooth bailout cog

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    I took the "pie pan" off my bike before it left the shop!! It was SO ugly. Twice as big as it needed to be.

    I've heard that if you somehow bend the derailleur hanger it can cause the chain to flip off the big cog even if the limit screw is set properly
    Marco Pantani died for your sins.

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  10. #10
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    Quote Originally Posted by tomk96 View Post
    upgrade to a carbon fiber one.
    Like this one?

    http://www.wmsracing.com/wmsweb/product11081.html

  11. #11
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    Yeah, my old Nishiki still has that huge thing on it. I have often considered removing, but I am trying to keep it original, even if it looks dorky. Speaking of dorky: I was riding with our group the other day and a new member showed up with a new Felt that was still wearing all the reflectors. Haven't seen that for a while.
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  12. #12
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    Quote Originally Posted by My Own Private Idaho View Post
    Wow...

  13. #13
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    The bike fell and only the disk broke? How is that possible?

  14. #14
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    Mandatory things to be removed from a bike before being seen in public are:
    Bells
    Wheel reflectors
    LBS stickers
    and YES - Spoke protectors...
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  15. #15
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    The plastic guard serves an extremely important purpose!

    It allows other riders to know who the noobs are.

    That, and reflectors, and a two gallon seat bag.
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  16. #16
    A wheelist
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    Quote Originally Posted by Opus51569 View Post
    The purpose of the guard is to keep the chain from over shifting into the spokes by accident.
    Nope, it's to prevent the spokes being nicked by the chain if it ever derails over the top of the cogs. Only limit screws (properly set!) will do what you say.
    .

  17. #17
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    Quote Originally Posted by Juzzy004 View Post
    Mandatory things to be removed from a bike before being seen in public are:
    Bells
    Wheel reflectors
    LBS stickers
    and YES - Spoke protectors...
    Add to that list the ridiculous amount of yellow warning stickers I found on my wife's new Specialized.

  18. #18
    tlg
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    I think they're acceptable IF they are not larger than your biggest cog, and preferably clear.
    But when they look like this? WTF!
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  19. #19
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    Quote Originally Posted by My Own Private Idaho View Post
    Oh my. "But then we have all dropped a chain between the spokes and cassette no matter how well tuned our bikes are..."

    Do they make a version that has some ceramic bearings superglued on there somehow?

  20. #20
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    Quote Originally Posted by tomk96 View Post
    upgrade to a carbon fiber one.
    All the cool kids are now running titanium.

  21. #21
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    Quote Originally Posted by Opus51569 View Post
    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.
    A good habit is as hard to break as a bad one..

  22. #22
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    OP Send the bike back to Trek for a replacment.
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  23. #23
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    Quote Originally Posted by iclypso View Post
    OP Send the bike back to Trek for a replacment.
    Normally a safe assumption, but every so often it's a good idea to go into a profile and look at a noob's prior posts.

    You mean Giant.

  24. #24
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    Quote Originally Posted by Juzzy004 View Post
    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....
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  25. #25
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    To the OP who asked whether the spoke protector disc is really needed, it depends on who you'd ask. From the viewpoint of the Feds, refer to this link I stumbled upon:

    Recall

    Be the judge.

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