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PostPosted: Wed Feb 22, 2012 12:26 pm 
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Joined: Mon Jun 23, 2008 8:52 am
Posts: 640
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:
http://bicycling.com/blogs/thisjustin/f ... p-2013.jpg" onclick="window.open(this.href);return false;" onclick="window.open(this.href);return false;


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PostPosted: Wed Feb 22, 2012 7:07 pm 
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Joined: Mon Jan 24, 2005 9:41 pm
Posts: 760
Location: Uppsala, Sweden
Permon wrote:
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:
http://bicycling.com/blogs/thisjustin/f ... p-2013.jpg" onclick="window.open(this.href);return false;" onclick="window.open(this.href);return false;" onclick="window.open(this.href);return false;


but "weight is claimed at 1,908 grams, a 67-gram reduction from Dura-Ace 7900", we al know that the 7900 doesn't weight 1975 grams, so i would´t trust in that claimed weight of 9000 groupset


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PostPosted: Wed Feb 22, 2012 7:33 pm 
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Joined: Wed Nov 05, 2003 7:27 pm
Posts: 2510
Location: Manchester, UK
So are we saying NONE of my current wheels are compatible with DA9000?


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PostPosted: Wed Feb 22, 2012 8:01 pm 
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Joined: Mon Jan 24, 2005 9:41 pm
Posts: 760
Location: Uppsala, Sweden
NS wrote:
So are we saying NONE of my current wheels are compatible with DA9000?


at least not with the new cassette. IF the rumor is true


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PostPosted: Wed Feb 22, 2012 8:51 pm 
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Joined: Wed Jan 25, 2006 8:32 pm
Posts: 550
Location: Bow of a Farr 40
52-38! Finally the best combo on a 130mm spider money can buy. For a mix of racing/sportives it makes a lot of sense for people who work ~50 hours a week and can't train as much as they like. I've not seen this combo since a Stronglight Pulsion (sp?) back in '06 or '07. Bravo.

What's the rear hub flange spread like now? How far is the DS flange off centerline?


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PostPosted: Wed Feb 22, 2012 9:03 pm 
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Joined: Tue Nov 11, 2003 9:47 pm
Posts: 2177
Location: Santa Cruz, California, USA
I wonder what "direct mount" brakes are.


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PostPosted: Wed Feb 22, 2012 9:16 pm 
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Joined: Wed Feb 03, 2010 1:31 am
Posts: 461
Frans wrote:
52-38! Finally the best combo on a 130mm spider money can buy.


But if the rumors posted above are correct, Dura Ace is not going to be 130mm bcd. Its going to 4 arm spider of some new bcd.


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PostPosted: Thu Feb 23, 2012 1:29 am 
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Joined: Wed Dec 07, 2011 1:26 am
Posts: 414
Location: California's country side
This is it... I don't want smaller hoods, funny brakes,
I am buying 7900 now


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PostPosted: Thu Feb 23, 2012 3:13 am 
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User avatar

Joined: Wed Nov 16, 2011 1:37 am
Posts: 80
Location: Sydney
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 :noidea:


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PostPosted: Thu Feb 23, 2012 3:13 am 
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Joined: Wed Nov 16, 2011 1:37 am
Posts: 80
Location: Sydney
.


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PostPosted: Thu Feb 23, 2012 3:26 am 
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Joined: Tue Sep 14, 2010 3:28 pm
Posts: 1405
howler wrote:
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 :noidea:


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 :hmm: whats that all about? Looks Zed crankset is super cool except that you have to buy the entire frame :evil: and so on.


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PostPosted: Thu Feb 23, 2012 4:55 am 
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Joined: Sun Jan 20, 2008 6:40 pm
Posts: 200
Location: Here during the week, home on the weekends
"- The mechanical version will use a proprietary shift cable."

This alone would be a deal breaker for me.


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PostPosted: Thu Feb 23, 2012 5:30 am 
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Joined: Tue Dec 27, 2011 2:19 pm
Posts: 659
what is the cog width/spacing on the 11 speed cassette? Campy compatible?


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PostPosted: Thu Feb 23, 2012 5:35 am 
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Joined: Mon Apr 19, 2010 10:33 pm
Posts: 167
bricky21 wrote:
howler wrote:
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 :noidea:


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 :hmm: whats that all about? Looks Zed crankset is super cool except that you have to buy the entire frame :evil: and so on.


For a racing bike I think best performance will come from more integration, at the top end. Trouble is its tough to spend 15K for a bike and not be able to re use all the parts, but top end bikes are about the only racing vehicles where integration isn't the rule.


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PostPosted: Thu Feb 23, 2012 8:43 am 
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Joined: Tue Apr 12, 2011 8:08 am
Posts: 2275
Location: Pedal Square
PoorCyclist wrote:
This is it... I don't want smaller hoods, funny brakes,
I am buying 7900 now

Just give it a bit more time and you'll get a better deal ...

_________________
Bikes: Raw Ti, 650b flatbar CX


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