10 speed: Dura-Ace 7900 crank compatibility.

Shimano Dura-Ace 7900 cranksets do not have a removable spider. Therefore Quarq a power meter spider cannot be mounted to the Shimano 7900 crank arms. 

If you have a Shimano Dura-Ace 7900 crank, and wish to use a Quarq power meter, you would need to purchase a Quarq power meter chassis (power meter spider and crank arms) which takes the place of the Shimano crank arms. 

Available Quarq power meter chassis' include:

  • Quarq DZero Carbon
  • Quarq DZero Aluminum

See the article "Dura-Ace 7900 chainring compatibility." to determine which Quarq power meters are compatible with 10 speed Dura-Ace 7900 chainrings.

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