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  1. #1
    Member LeanMachine's Avatar
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    Why did my bike munch my RD?

    I was about to go down a pretty extensive decline when my chain bounced partially off the big ring. Instead of stopping infront of traffic I coasted down the hill and stopped to readjust. I retracted the chain onto the ring again, mounted, pushed out and got about 10-15 feet when my bike skidded to a stop


    I looked down and my previously straight derailleur was twisted and one of the cogs was broken.

    I'd like to know what I did wrong. My bike lacks the mechanism (front derailleur?) to shift rings, so I do it manually.

    I miss commuting on my huffy and I am sad, I am going to bring it to my LBS, since I need a new RD and it can't be straightened with the tools I have.

    20140405_215210 (1).jpg

    Here is a pic, it is basically twisted 90 degrees into the spokes

  2. #2
    Senior Member Dave Cutter's Avatar
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    I'd guess that your chain bounced partially off the big ring and the derailleur. You repositioned the chain back on the big ring but missed what was going on with the rear derailleur. It is impossible for me to guess it the rear derailleur was damaged before or after you stopped.

    It might be a good idea to find a similar donor bicycle... to take parts from. Maybe a cheap unusable bicycle with front-end damage.
    Last edited by Dave Cutter; 04-05-14 at 09:20 PM.

  3. #3
    Member LeanMachine's Avatar
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    I will look into that, thanks. I have a new bike on its way so this one might just be donated to a worthy cause

  4. #4
    johnliu@earthlink.net jyl's Avatar
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    If the chain was twisted or dislodged from the rear derailleur jockey wheels, when you resumed pedaling it could have gotten jammed in the jockeys. When you continued pedaling, you damaged the derailleur, possibly by pulling it into the spokes, which could have locked the real wheel. I'm not clear what kind of bike it is - I think of "Huffy" as a low end bike, but anyway it may not be worth repairing.
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  5. #5
    Member LeanMachine's Avatar
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    It is an old huffy, the RD is a XUNDAH which from my research is a cheap Chinese RD made for mountain bikes. There has been a bike I have been eyeing all year that is basically abandoned that I might have to piece apart.

  6. #6
    Mechanic/Tourist
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    Anytime you have an accident or incident with your bike it's important to run through the range in front and back, spin the wheels and check the brakes before hopping back on the bike. As you have found out not doing so can cause very big problems very quickly.
    There's no such thing as a routine repair.

    Don't tell me what "should" be - either it is, it isn't, or do something about it.

    If you think I'm being blunt take it as a compliment - if I thought you were too weak to handle the truth or a strong opinion I would not bother.

    Please take the time to post clearly so we can answer quickly. All lowercase and multiple typos makes for a hard read. Thanks!

  7. #7
    Member LeanMachine's Avatar
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    I will keep that in mind. I was timing myself and I likely used a fair bit of power to start in the highest gear. Wasn't thinking but will do so in the future.

  8. #8
    Senior Member
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    Also, as you just discovered. The front derailuer serves as a chain guide. Most cranksets have shifting ramps and pins, which will throw the chain without a derailuer or other chain keeper.

  9. #9
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    Happens Until Finally Find Yourself (a real bike).
    Seriously though, most likely the chain came of the r dlr pulley, and when you resumed the hour record attempt, it predictably did what it did. As others have mentioned, when you have a mishap or crash (and before starting a ride) Its a good idea to spin the wheels, and turn the cranks, takes 10 seconds, and can save a lot of grief.

  10. #10
    Member LeanMachine's Avatar
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    Quote Originally Posted by wheelreason View Post
    Happens Until Finally Find Yourself (a real bike).
    Seriously though, most likely the chain came of the r dlr pulley, and when you resumed the hour record attempt, it predictably did what it did. As others have mentioned, when you have a mishap or crash (and before starting a ride) Its a good idea to spin the wheels, and turn the cranks, takes 10 seconds, and can save a lot of grief.

    You know me too well, I managed to get the RD off, it was super twisted and I had to cut the cable, hindsight makes me feel this was a bad decision. I might just take a few links of the chain and make it a fixie, this won't happen for a while. I am hoping if I sell it with the buzzwords "vintage" and "fixie" I can attract a susceptible hipster.


    My new bike comes Wednesday, so I hope all my previous mistake allow me to make less with my new one.

  11. #11
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    Quote Originally Posted by LeanMachine View Post
    I will keep that in mind. I was timing myself and I likely used a fair bit of power to start in the highest gear. Wasn't thinking but will do so in the future.
    That's a whole 'nother topic, but starting in the highest gear will just slow you down. In fact in most instances riding in the highest gear on the level will slow you down.
    There's no such thing as a routine repair.

    Don't tell me what "should" be - either it is, it isn't, or do something about it.

    If you think I'm being blunt take it as a compliment - if I thought you were too weak to handle the truth or a strong opinion I would not bother.

    Please take the time to post clearly so we can answer quickly. All lowercase and multiple typos makes for a hard read. Thanks!

  12. #12
    Senior Member Dave Cutter's Avatar
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    Quote Originally Posted by LeanMachine View Post
    ..... I might just take a few links of the chain and make it a fixie....... I am hoping if I sell it with the buzzwords "vintage" and "fixie" I can attract a susceptible hipster.
    I can see it now listed on Craigslist: Classic vintage fixie. Like new tires still have nubs. Might benefit from tune up.

    [Be sure to include a blurry picture taken in near darkness... it should be impossible to determine even the color of the bicycle... let alone the model.]

  13. #13
    coprolite fietsbob's Avatar
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    on my huffy
    thats part of it, .. and the other is bending, past damage done but ignored ..


    if you :"sell it" either ask steel scrap price , by the pound or actually, offer them gas money to take it away ..

  14. #14
    Member LeanMachine's Avatar
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    Quote Originally Posted by Dave Cutter View Post
    I can see it now listed on Craigslist: Classic vintage fixie. Like new tires still have nubs. Might benefit from tune up.

    [Be sure to include a blurry picture taken in near darkness... it should be impossible to determine even the color of the bicycle... let alone the model.]

    I might add "rare" as well. Or I could leave the cassette on and call it a "rare convertible fixie" with a back story of its fictional creation

    Also I weighed the bike this morning it was 38lbs, not sure how much of that is rust thought
    Last edited by LeanMachine; 04-07-14 at 02:24 PM.

  15. #15
    Senior Member Dave Cutter's Avatar
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    Quote Originally Posted by LeanMachine View Post
    I might add "rare" as well....... I weight the bike this morning 38lbs
    Solid Classic vintage fixie. Not made like this old steel beauty anymore. Like new tires still have nubs. Might benefit from tune up.

    Now... I feel ashamed.

  16. #16
    Member LeanMachine's Avatar
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    Maybe I should just post it in the free section. But I also want to see who will bite on it.

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