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Old 03-26-11, 09:01 AM   #1
clksoft
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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?
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Old 03-26-11, 09:09 AM   #2
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freewheel
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Old 03-26-11, 11:04 AM   #3
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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.
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Old 03-26-11, 07:13 PM   #4
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"MF" = multiple freewheel
"CS" = cassette system
Sometimes Shimano makes a lot of sense.
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Old 03-27-11, 11:29 PM   #5
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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.
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Old 03-27-11, 11:35 PM   #6
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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.
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Old 03-28-11, 06:11 AM   #7
clksoft
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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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Old 10-01-14, 02:35 PM   #8
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Help finding 11-28 for my folding bike

Quote:
Originally Posted by clksoft View Post
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).
Hi clksoft, iread you have changed your chainring from 46 to 60t, from your folding bike, but what happens with your distance of foot pedal to the ground?

I have an electric folding bike and would like to replce shimano mftz21 for 11-28 cas

Thx for your reply

Frank ( the netherlands)
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Old 10-02-14, 01:30 AM   #9
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Hi clksoft, iread you have changed your chainring from 46 to 60t, from your folding bike, but what happens with your distance of foot pedal to the ground?
Pedal-to-ground clearance is determined by crankarm length, not chainring tooth count. With the same crank/crank length, going to a bigger (more teeth) chainring doesn't change the pedal-to-ground-clearance.

(well, maybe a tiny bit when cornering IF a replacement crank has the same length but a bigger Q-factor - pedals wider apart.)
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