Shimano Ultegra 6700 cranksets do not have a removable spider. Therefore a Quarq power meter cannot be mounted to the Shimano 6700 crank arms.
If you have a Shimano Ultegra 6700 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 "Shimano Ultegra 6700 chainring compatibility" to determine which Quarq power meters are compatible with 10 speed Ultegra 6700 chainrings.