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  1. #1
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    Shimano Number Schemes: Magic, Science, or Something Else?

    I'm looking at Jenson USA and I see two 105 FDs.

    Shimano 105 FD-5504 Front Derailleur (http://www.jensonusa.com/Front-Derai...ont-Derailleur) and Shimano 105 FD-5501 Front Derailleur (http://www.jensonusa.com/Front-Derai...ont-Derailleur).

    What is the difference between the 5504 and the 5501? Last years model? How do I find this for other components?

    Thanks!
    The secret of steel has always carried with it a mystery.

  2. #2
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    Quote Originally Posted by amgarcia View Post
    I'm looking at Jenson USA and I see two 105 FDs.

    Shimano 105 FD-5504 Front Derailleur (http://www.jensonusa.com/Front-Derai...ont-Derailleur) and Shimano 105 FD-5501 Front Derailleur (http://www.jensonusa.com/Front-Derai...ont-Derailleur).

    What is the difference between the 5504 and the 5501? Last years model? How do I find this for other components?

    Thanks!
    Looks like one is set up for double cranks, whilst the other is for triple cranks. Probably more but that's what I noticed at first glance.

  3. #3
    Senior Member
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    That seems fine. I plan on running a double anyway.
    The secret of steel has always carried with it a mystery.

  4. #4
    Senior Member bhchdh's Avatar
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    You can get detailed information here:
    http://techdocs.shimano.com/techdocs...=1222691330160

  5. #5
    Insane Bicycle Mechanic Jeff Wills's Avatar
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    Quote Originally Posted by ls1geezer View Post
    Looks like one is set up for double cranks, whilst the other is for triple cranks. Probably more but that's what I noticed at first glance.

    Nope. That's all there is to it. Shimano nomenclature increments "double" front derailleurs by three to make a "triple". That is:
    Ultegra FD-6500 "double" + 3 = FD-6503 "triple"
    Tiagra FD-4400 "double" + 3 = FD-4403 "triple"
    Dura-Ace FD-7800 "double" + 3 = FD-7803 "triple"
    etc.
    Jeff Wills

    All my bikes.

  6. #6
    SE Wis dedhed's Avatar
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    And typically XX01 & XX04 are different finishes. Example is 6601 Ultegra "double" "ice grey finish" 6604 Ultegra "triple" ice grey
    '68 Raleigh Sprite, '02 Raleigh C500, '84 Raleigh Gran Prix, '91 Trek 400

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