SHIMANO Ultegra Di2 R8150 Front Derailleur - 12-Speed - Braze-On wahoopromo Campy derailleurs work best with

Campy derailleurs work best with cassettes up to 11-36

For Ultegra 6703 and 105 5703 triple drivetrains

Use of a clutch-style rear derailleur is recommended

Barrel bosses at the dropouts and crown

0mm (1-1/8") crown race for traditional headsets - Aluminum steerer with 43mm rake

SHIMANO Ultegra Di2 R8150 Front Derailleur - 12-Speed - Braze-On wahoopromo Campy derailleurs work best withMore compact and faster than ever, the ULTEGRA R8150 front derailleur performs digitally precise front shifts under any circumstances. Combining Shimano's new Di2 platform and the road incarnation of HYPERGLIDE+, the ULTEGRA R8150 front derailleur shifts between chainrings with our fastest, most seamless action. Shimano's fastest ever front shifting, 45% faster than FD R9150 Smaller, sleeker, lighter Frontal area reduced by 33% Weight cut to 116 g Top