Hi,

Here are some additional details on Shimano’s new Dura-Ace 9000:

- There will be electronic (Di2) and mechanical versions.
- DA9000 Di2 gets shift levers, “similar” to Ultegra Di2, as well as the narrow-diameter Di2 wiring harness unveiled on the new Ultegra Di2.
- The cranks use a four-arm spider (like Shimano mountain cranks; current road cranks use a five-arm spider) and a new, lighter, bottom-bracket system. Shimano is sticking with their 24mm axle standard; there is no BB30 or BB386EVO option.
- The hoods on the mechanical STI levers are smaller, with a more ergonomic fit and feel.
- The mechanical version will use a proprietary shift cable.
- Front-derailleur shifting effort is reduced by 38% (claimed).
- The brakes are all new. There are two mounting options: standard center bolt and two-bolt aero/TT style.
- The mechanical group’s weight is claimed at 1,908 grams, a 67-gram reduction from Dura-Ace 7900.
- The cassette and freehub body are wider: 10-speed cassettes will work on 11-speed wheels (with a spacer), but not vice versa. Rear hub spacing remains 130mm.
- Shimano did not add any more carbon: Like DA7900, only the brake-lever blades and rear-derailleur pulley cage are carbon.
- The Shimano document also describes a new dropout out configuration for road bikes, but our sources say, “There’s not really any change on that from our perspective.”

You can also check this out:
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So are we saying NONE of my current wheels are compatible with DA9000?

52-38! Finally the best combo on a 130mm spider money can buy.

digging the promised weight reductions and improved ergonomics but why the 4-arm spider?? OK on an MTB crank as rings are smaller, but if Zipp's experience is anything to go on, 52T road chainrings need the 5th arm to ensure chainring stiffness. Maybe shimano's hollow outer ring can do with only 4

Is it just me or does there seem to be a lot of effort to make more and more propitiatory bike parts these days? Look at all the(marketed as better)different BB standards, and with each one except BB30 you get limited crank choices. Shimano's 4-1 brake ratio whats that all about? Looks Zed crankset is super cool except that you have to buy the entire frame and so on.

This is it... I don't want smaller hoods, funny brakes,
I am buying 7900 now