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What is the difference between Shimano TZ50 and Shimano RD-FT55-SS?

Shimano RD-FT55-SS

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Shimano TZ50

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I understand, that both of them a very basic. (But it's the only options for rear derraliuer with reverse hanger.)

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    You linked to the product page for each derailleur, each of which has the specifications. There's your answer. – Argenti Apparatus Nov 14 '19 at 23:41
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    @ArgentiApparatus, from what I read, I didn't notice any significant differences. – Michael D Nov 15 '19 at 12:58
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    Total capacity is very different, because the TZ50 has a longer cage. – Argenti Apparatus Nov 15 '19 at 13:27
  • Odd - I notice BOTH of your images show a hanger claw that is reversed. Normally the silver bolt is on the left side. The other website states clearly "THIS WILL NOT FIT A STANDARD DROPOUT" which is odd. Perhaps this mech is intended for bikes with track-ends ? – Criggie Nov 15 '19 at 20:19
  • @ArgentiApparatus, got it!. I was not familiar with a Total Capacity concept. – Michael D Nov 16 '19 at 18:58
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A quick compare of both linked websites shows that the TZ50 is rated for a total capacity of 34 whereas the FT55 is only listed as capacity of 17.

Both are rated for a biggest big of 28 teeth, which is also their smallest big cog supported. IE its 28 tooth only.

The FT55 has a small of 11-14 and the TZ50 has a small of 14 only.

That means the FT55 is really only intended for a 1x setup, because 28-11 is 17 which is its maximum capacity.

The TZ50 is rated to be used on both a single and double chainring.


Additionally, the FT55 has a pulley wheel in the rear to reduce the amount of outer cable required. Your inner cable could be shorter and have less loop to catch on things. All up, I suspect the FT55 is intended for folding bikes with a 1x 14-28 freewheel.

These are $10 / £10 / €10 parts. Realistically, noone cares about weight or colour or anything at this end of the parts spectrum. Even the orange jockey wheel is pretty irrelevant.


And remember Shimano's specs are very cautious. I personally have used a TX-50 6 speed derailleur very similar to this, and it now runs an 8 speed cassette with a triple on front and the cassette ranges from 11 to 32 tooth, and works well enough. 30 tooth would have been less clattery, and I suspect 34 tooth wouldn't work at all.

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