Lightweight InsulationLightweight Insulation

Description

Sculpture with less weight and more .

The Shimano Dura-Ace FC9000 has been redesigned to be sleeker and lighter, all while increasing power transfer.

For far too long there was much switching between brands when you wanted a standard of compact crankset. The Shimano Dura-Ace FC-7900 changes that as it is available in both "compact" 50/34tooth and "standard" 53/39tooth configurations.

More noticeable are the aesthetics of the 7900. As Shimano continuously refines the Dura-Ace groupset, so too have the cranks been given a makeover. They are sleeker and trimmer than the previous iteration and via the redesign, they are also lighter and stiffer. Seems like a good upgrade to us. Additionally, the interface between the crankarm and the spider is cleaner. The entire redesign is Shimano's most sculptural yet.

The Hollowtech II crankarms feature a hollow (as the name implies) thin-walled forged design. All in all they weight 15grams less that the pervious 7800 series crankset. The outer chainring is also hollow. But it's not just for design, Chimano claims that the new forging makes them 20per cent stronger than the 7800.

And while weight is important, Shimano also looked at drag. the profile of the teeth was altered and the FC-7900 delivers more efficient chain contact. Having a precision fit between the chain and chainring means less loss of power. Additionally your front shifting is clean and as silent as a mechanical drivetrain is able to be. The bottom bracket seals have also been improved to reduce power-robbing friction.

The Shimano Dura-Ace FC-7900 and FC-7950 is available in the following crankarm lengths: 165mm, 170mm, 172.5mm, 175mm, 177.5mm, and 180mm. According to Shimano, it is only compatible with the Shimano Dura-Ace FD-7900 front derailleur and CN-7900 chain. It is not compatible with the equivalent 7800 series components. However, it is compatible with the Dura-Ace 7900, 7801, and 7800 series bottom brackets.

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Shimano Dura-Ace FC-7900/7950 Crankset

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Here's what others have to say...

Is the 7900 crankset compatible with 9000...

Posted on

Is the 7900 crankset compatible with 9000 11-speed group set?

Best Answer Responded on

Yes, you are good to go with the 7900 crank + new 11-speed :)

Responded on

Thanks, good to know.

How do you determine the right crank length?...

Posted on

How do you determine the right crank length? Is there a chart somewhere that aligns height and length?

Best Answer Responded on

Greetings - its a math equation of :
Recommended crank arm length in millimeters = ( 1.25 X inside leg in centimeters ) + 65.
:)

Greetings - its a math equation of :  <br/> Recommended crank arm length in millimeters = ( 1.25 X inside leg in centimeters ) + 65.   <br/> :) <br/>
5 5

Dura-ace

  • Gender: Male
  • Familiarity: I've put it through the wringer

I have been using shimano, my entire cycling life. Dura-ace, is amazing as always, the fit and finish are flawless. Pricy but worth it. Looking to go to 9000 series soon.

Dura-ace

Bonsoir,
J'ai lu votre texte sur le dura...

Posted on

Bonsoir,
J'ai lu votre texte sur le dura ace FC , mais quelles sont les differences entre le FC 7900 et le FC 7950 ?

Best Answer Responded on

Bonjour, le p�dalier 7900 a standards 53/39 plateaux, tandis que le 7950 est une manivelle compact avec 50/34 plateaux :)