Shimano FD-R9100 Dura-Ace Front Derailleur 31.8/28.6mm. Front Der/Shifter Compatibility Shimano Road. Front Derailleur Cable Pull Bottom Pull. Front Derailleur Clamp 31.8 (1-1/4"), 28.6 (1-1/8"). At Incycle Bicycles, we strive to harness the power of bikes to advance the good in everyone by providing exceptional value and service, supporting riders of all levels, and giving back to our communities.Please note: All bicycles will be assembled and test ridden by our professional mechanics to ensure proper and safe operation before being sent out to the customer.