Shimano dura ace di2 r9150 11sp front derailleurthis front derailleur from shimano features smooth shifting for exceptional pedalling performance'. '.strtoupper('t')he dura ace model benefits from a synchro shift feature for a high quality cycling performance you can count on'. '.strtoupper('f')eaturespart no fd r9150top gear teeth 46 55tchainstay angle 61 66chain line 43.5speed 11 speedcompatible chain hg ev 11 speed hg x11ergonomic shifting operation without stressshimano synchronised shiftrace endurance for less damage in a crashquick and smooth front shifting under high pedalling torquemaintains compact and smooth appearanceweight 104ga 2 year warranty is offered with all shimano products from chain reaction cycles 3 years on dura ace and xtr products.buy shimano components from chain reaction cycles, the world's largest online bike store.