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Shimano Dura-Ace Di2 9070 – Sneak peek

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Shimano is developing a new incarnation of their Dura-Ace Di2 electronic transmission

Shimano is developing a new incarnation of their Dura-Ace Di2 electronic transmission (Image credit: Warren Rossiter/Future Publishing)
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Internal wiring provides a clean look for Shimano Dura-Ace Di2 9070

Internal wiring provides a clean look for Shimano Dura-Ace Di2 9070 (Image credit: James Costley-White)
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The Shimano Dura-Ace Di2 9070 battery is designed to be housed inside the frame or seatpost

The Shimano Dura-Ace Di2 9070 battery is designed to be housed inside the frame or seatpost (Image credit: James Costley-White)
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The Shimano Dura-Ace Di2 9070 battery is designed to be housed inside the frame or seatpost

The Shimano Dura-Ace Di2 9070 battery is designed to be housed inside the frame or seatpost (Image credit: James Costley-White)
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The Flight Deck can be used to show battery level, perform simple system diagnostics and even programme the multi-shift function on Dura-Ace Di2

The Flight Deck can be used to show battery level, perform simple system diagnostics and even programme the multi-shift function on Dura-Ace Di2 (Image credit: James Costley-White)
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Shimano's latest Flight Deck computer can be used with both mechanical and electronic versions of Dura-Ace

Shimano's latest Flight Deck computer can be used with both mechanical and electronic versions of Dura-Ace (Image credit: James Costley-White)
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The under-stem junction box is the key to Di2 9070's versatility

The under-stem junction box is the key to Di2 9070's versatility (Image credit: James Costley-White)
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Note the Flightdeck logo on the shifters

Note the Flightdeck logo on the shifters (Image credit: Warren Rossiter/Future Publishing)
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Shimano Dura-Ace Di2 9070 STI lever

Shimano Dura-Ace Di2 9070 STI lever (Image credit: Warren Rossiter/Future Publishing)
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The Dura-Ace Di2 9070 levers are said to be more comfortable and provide quicker shifts

The Dura-Ace Di2 9070 levers are said to be more comfortable and provide quicker shifts (Image credit: Warren Rossiter/Future Publishing)
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Reshaping means the Shimano Dura-Ace 9070 hoods should be a more comfortable place to be

Reshaping means the Shimano Dura-Ace 9070 hoods should be a more comfortable place to be (Image credit: Warren Rossiter/Future Publishing)
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The Dura-Ace Di2 9070 rear derailleur has been similarly improved

The Dura-Ace Di2 9070 rear derailleur has been similarly improved (Image credit: James Costley-White)
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The Dura-Ace Di2 9070 front derailleur is said to be more compact, lighter and provide slicker shifting

The Dura-Ace Di2 9070 front derailleur is said to be more compact, lighter and provide slicker shifting (Image credit: James Costley-White)
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Dura-Ace Di2 9070 is looking good

Dura-Ace Di2 9070 is looking good (Image credit: Warren Rossiter/Future Publishing)
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A variety of different 'plug & play' accessories can be plumbed into the junction box

A variety of different 'plug & play' accessories can be plumbed into the junction box (Image credit: James Costley-White)

This article originally published on BikeRadar

Today's big news is the launch of a new version of Shimano's flagship Dura-Ace road groupset. But its electronic Di2 offshoot hasn't been forgotten – an updated version is in development. It's yet to be officially launched but Shimano did give us some information on what to expect from the new 11-speed Dura-Ace Di2 9070 series.

There must have been a temptation just to adapt the original Di2 7970 to cope with the extra sprocket out back. Instead, Shimano has gone for a wholesale revamp. As their UK distributors Madison put it: "They’ve proven it works, now they want to get it looking and working even better.”

As before, the electronic group shares mechanical Dura-Ace's crankset, chain, cassette and brakes. Elsewhere, there have been big changes though. The old wiring has been ditched in favour of the slimmer, modular, dual-core E-Tube configuration used on Ultegra Di2, and now Alfine Di2 too – apparently “the aim is to have a standard wiring system through all of Shimano’s Di2 groupsets”.

This means we now have the option to mix and match the groups, so expect some value-added options in complete bike specs next year. It also means it’ll no longer be necessary to heat-shrink the connections as with current Dura-Ace, as Di2 9070 will use the same waterproof connections as Ultegra.

The next big change is a new optional internal battery, available to fit either in the seatpost, seat tube or down tube. To get around any charging issues, a new junction box port will allow the battery to be charged in situ. As the internal battery doesn't require the same level of weatherproofing as the external version (though it's still fully sealed), it weighs 60 percent less.

The under-stem junction box is the key to Di2 9070's versatility

Shifter ergonomics have been improved, with an 8mm longer button and a new cable path on the brake lever, and the derailleurs are said to provide slicker shifting. They've also been significantly reduced in size and, more importantly, weight – as a pair they come in at 90g less than the current models.

The goal Shimano set out for the new Dura-Ace Di2, weight wise, was a 160g reduction overall, giving it parity with the mechanical group. The whole system weighed just 1,995g when we saw it in prototype form earlier this year – just 30g heavier than the mechanical version – and Shimano says the production transmission should still weigh sub-2,000g.

New for Dura-Ace 9070 is programmable multi-shift. This means that if you hold the button down, the rear derailleur will keep changing until it gets to the end of the cassette, reaches a pre-set (by you) number of shifts or you let go. This wrests back the major advantage of Campagnolo's EPS.

"Tunability" is a buzzword Shimano kept returning to at the launch. The new Di2 can be customised to suit your needs, with the PC interface (sold separately) allowing you to configure everything from shifter operation – want to switch over the left and right shifting? Well now you can – to the speed at which multiple shifts are made.

Myriad secondary shifter options to tune your bike to your needs are also available, including sprinter triggers, time trial shifters, tri shifters and a new top mounted Roubaix shifter. No additional wiring is needed to add these, and there's no setup procedure either – the new junction box below the handlebar allows you to plug-and-play.

There are two versions of the box – SM-EW90-A, with three ports, and SM-EW90-F, with five ports – and combined with the three ports on the back of each STI lever, this offers a huge range of setup options.

The five-port box is also designed to work with Shimano's latest Flight Deck computer (SC-R770) via an ANT+ wireless connection. When used with mechanical Dura-Ace, the touch-screen computer shows what gear you're in and can be paired with ANT+ devices to show your speed, cadence and heart rate. It also offers remote operation via a bar end switch. Connect the Flight Deck to Di2 9070, however, and it comes into its own. You can use it to adjust your gears, show the battery level, perform simple system diagnostics and even programme the multi-shift function.

Also in development is a time trial/triathlon-specific version of the new transmission called Dura-Ace Di2 9071. We'll bring you more on the new electronic groupset as soon as we get it.