Shimano Dura-Ace Di2 RD-R9150 Rear Derailleur carted the Service Course 70 Ergo

the Service Course 70 Ergo bar features the distinctive silver finish of Zipp's Service Course lineup

Position sensor

and sharp handling traits

Built-in type Junction-A for specific frame or handlebar end

Shimano Dura-Ace Di2 RD-R9150 Rear Derailleur carted the Service Course 70 ErgoSystem engineering at its peak. Each of the components magnifies the qualities of the others for an unparalleled level of performance. Optimizing input to maximize output. That's how it achieves supremacy.. Specifications Ergonomic shifting operation without stress SHIMANO synchronized shift Low profile rear derailleur design SHIMANO SHADOW RD Race endurance for less damage in crash Maintains compact and smooth appearance Mfr Claimed Weight 197g