I have a Rockrider 5.1 cycle with a Shimano MFTZ21 freewheel. In order to remove the freewheel, I purchased the Btwin tool kit. But the removal tool provided in the kit does not fit on my freewheel.

Here is a photo of the removal tool in the kit :

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Here is a photo of my freewheel :

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Here you can see that the diameter of the tool is a little too big to go in :

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So now I am considering buying the Parktool FR-1 freewheel removal tool. But will it fit on my freewheel?

2 Answers 2


Yes, the Park FR-1 (or something compatible) is your friend.


There is a technical difference between a cassette and a freewheel. A freewheel contains the ratcheting mechanism while a cassette sits on a freehub which contains the ratcheting mechanism.

It clearly says in that toolkit's page "shimano cassette removal tool". The MF-TZ21 is a freewheel. So Park Tool FR-1 is the right tool. They also have excellent instructions on changing your freewheel here.

  • Thanks. i was aware of this difference, but i took a calculated guess that the cassette removal tool would fit my freewheel before i purchased the toolkit. It has 12 splines and a 22.6 mm diameter, which matches the FR-1 and my freewheel as well. But i think it is a half a mm bigger than my freewheel. That's why i have a strong suspicion that the FR-1 will also have the same problem.
    – faizal
    Jun 27, 2014 at 5:49
  • A Shimano Cassette tool (Park tool FR-5) should have diameter around 23.4 mm while a freewheel tool 23mm. The splines on the freewheel tool (Park tool FR-1.2) are also significantly longer.
    – Batman
    Jun 27, 2014 at 14:45

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