Ultegra Di2 rear mech
Shimano Ultegra RD-R8150 Di2 Rear Derailleur
Ultegra's 12-speed Di2 rear mech brings Dura-Ace shift speed and the same semi-wireless layout at a lower price and a little more weight. A single cage runs cassettes from 11-28T to 11-34T.
Highlights
Why we rate it
Wireless hub
The mech carries the wireless receiver, charging port and status LED, so the levers talk directly to it with no junction box.
Dura-Ace-level speed
Shares the quicker motor and linkage design of the Dura-Ace mech, so shift timing is on a par with the top tier.
One cage covers it all
The same mech suits close-ratio race cassettes and wide 11-34T climbing setups.
Built to shrug off knocks
A saver function protects the motor gearbox if the mech takes a hit.
Tech specs
Specification
Manufacturer specification. Details may change without notice.
Specification
- Model code
- RD-R8150
- Speeds
- 12
- Actuation
- Di2 (semi-wireless, battery-in-frame)
- Max low sprocket
- 34T
- Min low sprocket
- 28T
- Top sprocket
- 11T
- Total capacity
- 39T
- Cage
- Single length, Shadow RD
- Pulleys
- 11T with cartridge bearings
- Ports
- 1 x EW-SD300 E-Tube, 1 x charging port
- Weight
- Approx. 262g
- Compatible levers
- ST-R8170 (wireless)
Ordering
Available from The Cycle Collective
Available to order through The Cycle Collective in Dorking. For availability, setup or advice, call 0203 148 6764 or email hello@thecyclecollective.cc.