Bicycle Mechanics - is the Shimano MF TZ21 a freewheel or a cassette?

Bikeforums.net is a forum about nothing but bikes. Our community can help you find information about hard-to-find and localized information like bicycle tours, specialties like where in your area to have your recumbent bike serviced, or what are the best bicycle tires and seats for the activities you use your bike for.



PDA
clksoft
03-26-11, 09:01 AM
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:

http://www.bikepedia.com/Images/image2.aspx?w=300&h=300&filename=CLST1080.jpg&f=Hawley

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

reptilezs
03-26-11, 09:09 AM
freewheel
HillRider
03-26-11, 11:04 AM
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.

Jeff Wills
03-26-11, 07:13 PM
"MF" = multiple freewheel
"CS" = cassette system
Sometimes Shimano makes a lot of sense.
laura*
03-27-11, 11:29 PM
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.
Sixty Fiver
03-27-11, 11:35 PM
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.
clksoft
03-28-11, 06:11 AM
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).