The Quarq DFour91 power meter is specifically designed to work with the Dura-Ace 9100 groupset. The DFour91 is sold as a chassis (power meter spider and crankarms) and takes the place of the Dura-Ace 9100 crank set.
Dura-Ace 9100 or Ultegra R8000 chain rings can then be installed onto the Quarq DFour91, preserving the shifting performance of your groupset.
The DFour91 power meter chassis is sold with a GXP or BB30 spindle.
DFour91 GXP frame compatibility: Requires new bottom bracket bearings in order to accept GXP crank.
- BB86 frames
- BB90 frames
- English threaded frames.
DFour91 BB30 frame compatibility: If your frame is one of the below standards, the Shimano crank will be installed with the use of an adapter. In this instance the adapter can be removed and a ELSA RS BB30 crank will be directly compatible.
- BB30
- BB30A
- PF30
- BBright
***Note: The DFour91 power meter is color matched to the Dura-Ace 9100 chain rings, not the Ultegra R8000 chain rings. This will not affect the fit of the chainrings or diminish the performance of the Ultegra group. It does mean there will be a color discrepancy between the chain rings and the cover plate of the power meter.