New Dura Ace 9000

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Spy shots of new Dura Ace 9000-series are wafting over from Japan. This is the new crank, a departure from the 130mm bcd 5-arm that has been traditional for Shimano’s top racing crank for decades. The four arm bcd looks fairly small, so I’d guess that the same forging will probably be used for both standard racing combinations (e.g. 53/39) and compact gearing (e.g. 50/34). It is interesting that the spider arms are not evenly spaced around the face of the crank; they seem to have narrower angles between the spider arms in the direction perpendicular to the crank arms. Besides the marketing benefits of system integration, this arrangement concentrates support for the chainrings where they will see the most stress (i.e. when the crank arms pass thru 3 o’clock). Shimano has been an industry leader in chainring design for 20 years now, and this latest version of Dura Ace uses the strength and rigidity of the hollow chainring (first introduced with DA 7900) to allow the spider bcd to be paired down. Aesthetically, I am undecided on the new cranks style, but I think it may be growing on me.

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Brakes are another facet that has been a standout for the last 5 generations of Dura Ace. Though I’m sure they stop awesome, but these brakes are hideous. I’m not quite sure how the pivots are laid out from just seeing the front of the caliper, but I’m very curious.



4 Comments

Shimano seriously missed the mark on these.  Where SRAM went for the aesthetic and function, this seemingly does neither.  If you’re going to go for a new standard, you better get it right.  I’m guessing this will be another one of the short-lived roll outs that Shimano backs down from quickly.

I’ve got no info on this, other than my take, but having seen the Saine kit, I’d think they’d roll that aesthetic out. Got high-rez photos of that group and uploading soon. Also, hearing from teams/mechanics that they’re going back to Shimano (non sponsored rides, can make that choice) because of SRAM’s durability issues and those are considerable.

The crank reminds me of the Thun Revolution cranks though those goofy things only used 3 bolts.

I don’t know about anyone else,  but both the crank and the brakes look freak’n cool.  Being a die hard Shimano fan for 25yrs I’ld ride that build in a second!

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