how to differentitate between Dura-Ace ST-7800, ST-7801,and ST-7803?
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  1. #1

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    how to differentitate between Dura-Ace ST-7800, ST-7801,and ST-7803?

    I'm buying a small accessory for my brakes and need to know if it's 7800, 7801, or 7803.

    I can't find the number on it. Any help is appreciated.

    thanks

  2. #2
    RoadBikeReview Member
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    When you say you need the part for your brakes, do you mean the calipers or the shifter/brake levers? I believe the 7800 series calipers were the only iteration. It was mainly the sti levers that had the 7800/ 7801 change and the 7803 triple option. As far as I know, the differences were all within the shift mechanisms and not so much in the external appearance or parts.

    What specifically are you trying to get?

  3. #3

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    I'm trying to buy this and they have two versions:
    http://specialized.com/gb/en/bc/SBCE...jsp?spid=30994

    2136-0110: Fits Dura-Ace (ST-7800) 10-speed levers only.15mm reach adjustment
    2136-0115: Fits Dura-Ace (ST-7801/7803) 10-speed levers only. 15mm reach adjustment

    ==================================================

    Copying the URL's content below


    Small hands? Hard time reaching your brake levers? These shims bring the brake levers 20mm closer to the drops, improving comfort and control. Specifically designed to reduce the reach on Shimano STI brake levers.

    Specifically designed for Shimano STI brake levers, reducing reach by 20mm for smaller hands
    2005-9001: Fits Ultegra (ST-6500/6501/6510) 9-speed levers. 20mm reach adjustment. Fits 105 (ST-5500/5501/5510) 9-speed levers. 20mm reach adjustment
    2136-0100: Fits Ultegra (ST-6600/6603) 10-speed levers. 15mm reach adjustment. Fits 105 (ST-5600) 10-speed levers. 15mm reach adjustment
    2136-0110: Fits Dura-Ace (ST-7800) 10-speed levers only.15mm reach adjustment
    2136-0115: Fits Dura-Ace (ST-7801/7803) 10-speed levers only. 15mm reach adjustment

  4. #4
    More cowbell!
    Reputation: Cyclo-phile's Avatar
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    It appears that 7801 is the 2x10 update of 7800 and was introduced at the same time as 7803 3x10. I can't really tell any differences from looking at the pictures, but maybe you can find a part number that corresponds to something on your levers.

    ST-7800
    http://techdocs.shimano.com/media/te...9830609263.pdf

    ST-7801/7803
    http://techdocs.shimano.com/media/te...9830609264.pdf
    DFL > DNF > DNS

  5. #5
    Rub it............
    Reputation: frdfandc's Avatar
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    Difference between 7800 and 7801...
    minor rerouting of the flight deck cables and slight redesign of the plastic grip.
    the face plates and reach adjusting shims are not interchangeable.


    the 7800 was the designation when they were first released. 7801 was the updated version. Hence the 7801/7803 designation in the tech docs.

  6. #6
    RoadBikeReview Member
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    Check the outside rear part of the STI lever - fold back the rubber hood where it meets the bar and you'll find the serial number. You need the right part as they are not interchangeable between 7800 and 7801.

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