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  1. #1
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    is the Shimano MF TZ21 a freewheel or a cassette?

    I am really confused. I would like to replace my 7-speed shimano MF TZ21 14-28t gearing with a 11-28t gearing. However, I am not sure whether I have a freeewheel or a cassette. Mine is identical to this one:



    Will the shimano HG-30 11-28t or HG-70 11-28t fit my setup?

  2. #2
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    freewheel

  3. #3
    Senior Member
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    Correct, it's a freewheel and any Shimano 7-speed freewheel will replace it. If you have friction shifting then any make 6 or 7-speed freewheel will replace it.

  4. #4
    Insane Bicycle Mechanic Jeff Wills's Avatar
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    "MF" = multiple freewheel
    "CS" = cassette system
    Sometimes Shimano makes a lot of sense.
    Jeff Wills

    All my bikes.

  5. #5
    Shop Wench
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    Quote Originally Posted by clksoft View Post
    I would like to replace my 7-speed shimano MF TZ21 14-28t gearing with a 11-28t gearing. However, I am not sure whether I have a freeewheel or a cassette.
    I don't think you'll find a freewheel that goes down to 11 teeth.

  6. #6
    Bicycle Repair Man !!! Sixty Fiver's Avatar
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    Quote Originally Posted by laura* View Post
    I don't think you'll find a freewheel that goes down to 11 teeth.
    Shimano used to make the MF-HG50 -7 in an 11-28 and an 11-34... I would love to find a few of these 11-28 versions.

    Suntour also made what is now a very rare freewheel with an 11 tooth cog.

  7. #7
    Junior Member
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    Thanks to everyone who replied. For now I am keeping my freewheel but changing the chainring from 46T to 60T (It's a 7-speed folding bike).

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