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  1. #1
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    Red face Chain guard for SHIMANO MF-TZ21 7 SPEED

    Hi there,

    Any chance someone could give me an advice regarding the proper chain guard for a Shimano MF TZ21 derailleur please?

    I've got a Teman hybrid Road/Racing bike with a shimano MF TZ21 7 speeds derailleur and I would like to buy a chain guard (for the derailleur only, not all the chain).

    Thank you in advance for your advices!

    Marion

  2. #2
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    Not sure I understand what you are asking. Are you talking about something to cushion the inside of the front derailleur so the chain doesn't hit the metal?
    “Statistics are like bikinis. What they reveal is suggestive, but what they conceal is vital.” -- Aaron Levenstein

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  3. #3
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    Not really, I'm talking about a plastic cover to protect the derailleur and avoid my trouser to get dirty..

  4. #4
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    Quote Originally Posted by Marion_Grenaud View Post
    Not really, I'm talking about a plastic cover to protect the derailleur and avoid my trouser to get dirty..
    Oh, a chain ring guard?

    https://www.google.com/search?q=cran...w=1280&bih=887
    “Statistics are like bikinis. What they reveal is suggestive, but what they conceal is vital.” -- Aaron Levenstein

    "Beware of geeks bearing formulas."
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  5. #5
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    yes exactly!

  6. #6
    tlg
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  7. #7
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    ..but he's talking about a REAR derailleur, not a front one.

    Besides, those only cover the chainrings, not the front derailleur. I don't think I've EVER seen a "derailleur cover" in 45 years of cycling.
    "L'enfer, c'est les autres"

  8. #8
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    Quote Originally Posted by No Time Toulouse View Post
    I don't think I've EVER seen a "derailleur cover" in 45 years of cycling.
    search (google images) "rear derailleur guard."

    those i've seen are normally found on lower-level vintage bikes. they were an ugly steel thing to protect the ugly, steel rear mech from getting road rash when you hop off the bike as it's still rolling, then falls down hard on its right side in the driveway. but you had to dismount that way for fear of missing the start of Twilight Zone.
    Yossarian: don't worry. nothing's going to happen to you that won't happen to the rest of us.

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    Quote Originally Posted by Marion_Grenaud View Post
    ... cover to protect the derailleur and avoid my trouser to get dirty..
    a chain guard to protect your trousers is very popular, especially on city bikes. a dutch bike just isn't a dutch bike without one.

    i often ride my vintage road bikes in jeans, but none of my bikes has a chain guard. so i roll up my jeans. tons of people do it the same way, or they use a big rubber band around the lower leg. brooks makes a leather trouser strap for this.
    Yossarian: don't worry. nothing's going to happen to you that won't happen to the rest of us.

  10. #10
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    Quote Originally Posted by No Time Toulouse View Post
    ..but he's talking about a REAR derailleur, not a front one.

    Besides, those only cover the chainrings, not the front derailleur. I don't think I've EVER seen a "derailleur cover" in 45 years of cycling.
    Read posts #3, 4 and 5 again.
    “Statistics are like bikinis. What they reveal is suggestive, but what they conceal is vital.” -- Aaron Levenstein

    "Beware of geeks bearing formulas."
    -- Warren Buffett

    "Education is what you get when you read the fine print. Experience is what you get when you don't. -- Pete Seeger



  11. #11
    wim
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    Quote Originally Posted by Marion_Grenaud View Post
    Hi there,

    Any chance someone could give me an advice regarding the proper chain guard for a Shimano MF TZ21 derailleur please?
    The MF-TZ21 is not a derailleur, but a screw-on 7-speed freewheel. The MegaRange version of this freewheel has a 34-teeth largest sprocket with a 10-tooth megajump to the next (24T) sprocket.

    On bikes with smallish front chain wheels, a chain guard doesn't work well with the MegaRange MF-TZ21 because the guard angles up too much from front to rear. It leaves your pants unprotected when the chain is not on the 34T. Perhaps that's what your issue is.

    Not sure what this freewheel is doing on your "Road/Racing bike."

  12. #12
    tlg
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    Quote Originally Posted by wim View Post
    Not sure what this freewheel is doing on your "Road/Racing bike."
    It's a $200 dept store bike. They like to give them cool names.
    Not that there's anything wrong with it. Probably a great choice for a city commuter.

    https://www.gumtree.com/p/bicycles/t...eed/1084093623


    The MF-TZ21 is not a derailleur, but a screw-on 7-speed freewheel.
    Correct. The OP, probably just looked at the bike specs and saw the incorrect "Shimano MF-TZ21 Darailleur". TZ though is the Shimano Tourney designation. Which is what the derailleurs are.
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  13. #13
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    Quote Originally Posted by blackfrancois View Post
    search (google images) "rear derailleur guard."

    those i've seen are normally found on lower-level vintage bikes. they were an ugly steel thing to protect the ugly, steel rear mech from getting road rash when you hop off the bike as it's still rolling, then falls down hard on its right side in the driveway. but you had to dismount that way for fear of missing the start of Twilight Zone.
    Oh, I've seen those-mostly on low-end MTB's. A $2 protector on a $5 derailleur....

    BTW, I've still never seen a 7-speed FRONT derailleur.....
    "L'enfer, c'est les autres"

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