Shimano Dura-Ace FD-R9250 Di2 Front Derailleur - 2x12-Speed | Braze-On Taillights Cassette lockrings require significant torque

Cassette lockrings require significant torque to install correctly and can be stubborn to remove when they've been seated through many miles

worth a claimed 3 to 6 watts of aero savings

Why Are the Shimano 105 PD-R7000 Pedals the Standard for Performance Road Riding

keeping weight down to 390g per pair while providing the structural integrity needed for real mountain bike riding

Shimano Dura-Ace FD-R9250 Di2 Front Derailleur - 2x12-Speed | Braze-On Taillights Cassette lockrings require significant torqueWhy Is the Shimano Dura Ace FD R9250 the Pinnacle of Front Shifting? The Shimano Dura Ace FD R9250 represents a complete redesign of what a front derailleur can be, shifting 45% faster than the previous generation FD R9150 while weighing under 100 grams and cutting frontal area by 33% for the most aerodynamic front derailleur Shimano has ever produced. As part of the semi wireless Di2 architecture of R9200, the FD R9250 wires to the BT DN300 battery