Dura-Ace is the admiral ship of Shimano, the Japanese (now multinational) manufacturer of cycling components (and some other things like fishing tackle and rowing equipment). Here is a brief history of the Shimano Dura-Ace.

1973: The first Dura-Ace release

The story begins in 1973, the same year that the Campagnolo Super Record group was introduced. The first Dura-Ace was built using aluminum. It was Shimano’s first attempt at the professional quality road racing component group niche which was dominated by Campagnolo, the Italian manufacturer who was unchallenged for years.

There were two types of rear derailleur (short-cage, up to 28-teeth compatible, and the long-cage, up to 34-teeth compatible). The cranks were 39/52 165mm, 45/54 165mm, 39/52 170mm, and 45/54 170mm.

The “pro” model had 5/6 speed options, while the “touring” model was 5-speed.

Shimano Dura-Ace 1973 Package Contents Specifications
Shimano Dura-Ace 1973 Catalogue: Package Contents Specifications. Photo: SheldonBrown.com
Shimano Dura-Ace 1973 Catalogue: Shifters and Derailleurs
Shimano Dura-Ace 1973 Catalogue: Shifters and Derailleurs. Photo: SheldonBrown.com
Shimano Dura-Ace 1973 Catalogue: Crankset, Cassette and Front Derailleur
Shimano Dura-Ace 1973 Catalogue: Crankset, Cassette and Front Derailleur. Photo: SheldonBrown.com
Shimano Dura-Ace 1973 Catalogue - Brakes, Hubs and Head Parts
Shimano Dura-Ace 1973 Catalogue: Brakes, Hubs and Head Parts. Photo: SheldonBrown.com

1976: Dura-Ace 10

It was a track groupset that used a 10mm pitch chain and gears.

Almost all bike chains are half-inch pitch, so the centers of the pins are half an inch, or 12.7mm, apart. Introduced in 1976, and discontinued sometime in the 80s, Dura-Ace 10 used a smaller chain and therefore smaller chainrings and sprockets – the number of teeth was the same, but they were closer together.

The biggest advantage was lower weight, and eventually, according to legend, the Japanese Keirin federation banned the 10mm pitch equipment because it might give some riders an unfair advantage.

Dura-Ace 10 Series catalogue
Shimano Dura-Ace 10 Series catalogue (1976).

1977: Dura-Ace 7100

It was the second generation Dura-Ace. It was slightly different from the First Generation parts. Crank arms appear to be the same, but with different rings and used standard pedal threading.

Dura-Ace 7100 group
Shimano Dura-Ace 7100 group (1977)

1978: Dura-Ace EX 7200

The Dura-Ace EX 7200 introduced Shimano’s EX concept as being a design optimized for the (then radical) idea of using 6-speed, particularly with the new freehubs.

Dura-Ace EX 7200 group
Shimano Dura-Ace EX 7200 group (1978)

1980: Dura-Ace AX 7300

Shimano Dura-Ace AX 7300 comes out in 1980. It is specifically designed to be more aerodynamic.

Despite being a commercial disaster (Dura-Ace series were not really successful until the introduction of the indexed shifting, the “Shimano Index System – SIS” in 1984), the AX 7300 is arguably one of the foundation stones of Shimano’s current success.

It created a fear of being left behind that forced every other derailleur manufacturer in the world to redesign their own derailleurs to incorporate “aerodynamic” elements. With the European manufacturers already on their knees, and SunTour about to be clobbered by technical problems, this expenditure crippled every one of Shimano’s competitors.

Dura-Ace AX 7300 group
Shimano Dura-Ace AX 7300 group (1980).

1984: Dura-Ace 7400 series with Shimano Indexed Shifting (SIS)

In 1984, Shimano introduced the revolutionary Dura-Ace S.I.S. (Shimano Indexed Shifting), the first successful indexed-shifting system in cycling history. It was a 6-speed system (then 7 and 8-speed with the new versions) with indexed shifters mounted on the down tube.

Dura-Ace 7400 Groupset
Shimano Dura-Ace 7400 Groupset (1984)

1988: The First Grand Tour Victory: Giro d’Italia

In 1988, Andy Hampsten (Seven-Eleven Team) won the Giro d’Italia with the Dura-Ace groupset.

Andy Hampsten at Giro '88, climbing Passo di Gavia
Andy Hampsten climbing Passo di Gavia, Giro d’Italia 1988.

1990: Dura-Ace 7400 series with Dual Control Levers

The dual-control lever incorporates a shifter mechanism into the brake lever, making it possible to change speeds without removing one’s hands from handlebars. Another revolutionary upgrade.

Shimano Dura-Ace 7400 series 1990 catalogue
Shimano Dura-Ace 7400 series catalog (1990).
Shimano Dura-Ace 7400 dual control levers
Shimano Dura-Ace 7400 dual control levers

1993: Dura-Ace 7410

It was actually the last of the Dura-Ace 7400 series but was enough of a departure from the original 7400 series that many sources list it as a separate group.

Shimano Dura-Ace 7410 groupset
Shimano Dura-Ace 7410 groupset (1993)

1996: Dura-Ace 7700

7700 series are developed after a thorough review of the previous derailleur system based on the philosophy of “Stress-Free”.

A review about DA 7700 that I like: “Reining from 1996 to 2004 as Shimano’s top-end groupset, it is arguable that DA 7700 lacks the technological punch to stand out on its own against breakthrough DA 7400 or ultra-refined DA 7800. It was just a sort of 9-speed filler between the two. But in 1999 it was this component group that allowed Shimano to finally climb to the top of the podium at the Tour de France. A cyclist from Texas, USA may have helped it get there.” (campagnolodelta.blogspot.com)

Dura-Ace 7700 group
Shimano Dura-Ace 7700 group

1998: Dura-Ace 25th Anniversary Groupset

This series is a special Dura-Ace released in commemoration of 25 years since its introduction into the market.

Dura-Ace 25th Anniversary Group
Shimano Dura-Ace 25th Anniversary Group (1998)

1999: The first (now annulled) Tour de France victory

Lance Armstrong of the US Postal Team won the Tour de France 1999 using Dura-Ace 7700 groupset, but the U.S. Anti-Doping Agency (USADA) stripped his all seven Tour de France titles in 2012.

2004: Dura-Ace 7800

Dura-Ace 7800 series components are developed with “For 100% Power Transmission Efficiency” as a catchword. This series consisted of 10-speed rear drive trains, HOLLOWTECH Ⅱ cranksets, ergonomic dual control levers, and other higher performance components. It was the first 10-speed group on the market.

Dura-Ace 7800 group
Shimano Dura-Ace 7800 groupset (10-speed)

2007: The first (not annulled) Tour de France victory

Alberto Contador, the Spanish rider of the Discovery Channel team won the 2007 Tour de France using Dura-Ace 7800 groupset. As of 2021, Shimano has a total of 10 Tour de France victories.

2008: Dura-Ace 7900

The 7900 series components were developed under the concept of “Evolution of Perfection”. A derailleur comprising these components embedded the shift cable completely. Its crankset consisted of a HOLLOWGRIDE (hollow gear) in addition to a HOLLOWTECH Ⅱ. All other components were also reviewed for optimal design. The weight of the groupset w/out hubs reduced from 2181 grams (DA 7800) to 2052 grams (DA 7900).

Dura-Ace 7900 group
Shimano Dura-Ace 7900 groupset (2008)

2009: Dura-Ace Di2 (electronic)

2009 Electronic Shifting System DURA-ACE 7970 is in the market. A new technology called “Digital Integrated Intelligence (or Di2 for short) was introduced into Dura-Ace. The Dura-Ace 7900 series equipped with this electronic shifting system provides racers with a “complete stress-free” function. Enhanced shifting performance is the most obvious benefit of Shimano’s Di2.

“A solution to a problem that doesn’t exist.” “Unnecessary.” “A marketing gimmick.” Those were lines offered against Shimano’s Dura-Ace Di2 electronic drivetrain, but it quickly became a racing standard. Today, almost every pro team uses electronic gears.

Dura-Ace 7900 Di2 groupset
Shimano Dura-Ace 7900 Di2 electronic groupset

2012: Dura-Ace 9000 (11-speed)

The new series has been fully re-engineered across every system. Highlights include a very robust four-arm crankset, the new SLR-EV brake system, and a new 11-speed drive train. 9000 is mechanical and 9070 is electronic (Di2) series.

Dura Ace 9000 group
Shimano Dura-Ace 9000 mechanical groupset (11-speed)

2016 – Dura-Ace R9100/R9150

Dura-Ace R9100 (mechanical) and R9150 (electronic) series coming with an integrated power meter (which has been ten years in development), first-ever Dura-Ace hydraulic disc brakes, and the option of synchronized front and rear derailleur shifting to minimize cross-gearing. The crankset and the front and rear derailleurs were also redesigned.

Another change point is the largest sprocket size: it was 28-tooth on previous versions of Dura-Ace, but now the new version is offering an 11-30-tooth cassette.

Shimano use codes R9100 and R9150 for the groups with classic rim brakes, and R9120 and R9170 for the groups with hydraulic disk brakes.

Shimano Dura Ace R9100
Shimano Dura-Ace R9100 groupset (mechanical)
Shimano Dura Ace Di2 R9150
Shimano Dura-Ace Di2 R9170 groupset (electronic, with disk brakes)

2021: Dura-Ace R9200, 12-speed and semi-wireless

Dura-Ace R9200 is Shimano’s new generation top-level groupset and has some big changes from its predecessor, including super-smooth Hyperglide +, a 12-Speed cassette, and wireless shifters.

Some key points are:

  • For the first time ever, there’s no mechanical shifting option: the mechanical Dura-Ace is now history.
    • R9270: Disc brakes with electronic shifting
    • R9250: Rim brakes with electronic shifting
  • Interestingly, the new version is slightly heavier than its predecessor, the R9100.
  • It is available in both rim brake and disc brake variants – but the bist brake version has wireless levers.
  • 300 hour battery life (same as the previous R9100)
  • The derailleurs and main battery are wired-in
  • The new series has the fastest (and most precise) shifting in all Dura-Ace versions.
  • 11-34 cassette option
New Shimano Dura-Ace R9200, First Look And Ride. Video by the Global Cycling Network.
Shimano Dura-Ace R9200 groupset (2021)
Shimano Dura-Ace R9200 groupset (2021)

Sources

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3 Comments

  1. Hi Özgür
    Congratulations. Nice historic view on Shimano Parts.
    I am a former amateur cyclist from 85 to 93. My favorite
    bike, was the koga myjata full pro from 1990 with Dura ace
    7400 and the First and famous STI grip shifter.
    Now, 30 years later, I would like to refurbish the bike.
    Due to some Racing crashes, the STI shifter are looking really
    Battered. Do you know, if there is a shop, That has new
    Components from this 7400 group?
    Best regards
    Matthias

  2. Very nice timeline of the iconic Dura Ace groups.
    It is not Hampsten but Johan van der Velde on the Gavia in 1988. Can remember the TV broadcasting very well.

    Ciao,
    Antoine Vos

  3. Muchísimas gracias por la información he buscado páginas y no me daban tan exacta la información excelente deberían hacer porfa si tienen mascones sram y campagnolo Muchas gracias.

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