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Compatibility: DFour and DFour91

Quarq DFour91 is designed for Dura-Ace® R9100 chainrings.

UPDATE (October 16, 2017) It is compatible with Ultegra® R8000 chainrings.

 

Quarq DFour is designed for Dura-Ace® 9000 chainrings.

It is compatible with Ultegra® 6800 and 105® 5800 chainrings.

Buy DFour91