Rear derailleur Shimano ULTEGRA Di2 RD-R8150 12-speed

The Shimano ULTEGRA Di2 RD-R8150 rear derailleur is designed for a 12-speed system. Its settings, including shifting speed and mode, can be customised using the E-TUBE app.

Features and specifications

• Ride settings can be customised to suit the rider’s preferences using the E-TUBE app.
• Set the shifting speed, choose fully or semi-synchronised shifting, and assign functions to the programmable buttons on the shift lever.
• The wireless protocol increases shifting speed while maintaining the accuracy and reliability associated with SHIMANO.
• Fast, precise shifting for quick acceleration at any speed.
• Low-profile design.
• SHIMANO SHADOW RD.
• The optimised design helps minimise the risk of damage to the derailleur system in the event of a fall.
• Compact, streamlined design.
• Shimano group: ULTEGRA Di2 R8250.
• Mounting method: Direct Mount.
• Compatible with 12-speed systems.
• Compatible chain: CN-M8100 HG, 12-speed.
• Maximum number of teeth on the largest sprocket: 34T.
• Minimum number of teeth on the largest sprocket: 30T.
• Maximum number of teeth on the smallest sprocket: 11T.
• Minimum number of teeth on the smallest sprocket: 11T.
• Maximum tooth difference between the largest and middle chainrings: 16T.
• Maximum capacity: (largest front chainring – smallest front chainring) + (largest rear sprocket – smallest rear sprocket): 33T.
• Compatible electric wire: EW-SD300.
• Firmware updates via E-Tube Project.
• Number of E-tube ports: 1.
• Number of E-tube connectors: 0.
• Di2 wireless chip.
• Material: aluminium / carbon-fibre-reinforced plastic.

Technologies

SHADOW RD – This rear derailleur technology is designed for more aggressive riding. Its extremely low-profile design offers several benefits. The low profile and single-tension design prevent the chain from hitting the lower frame tube, even during aggressive riding. The result is smooth, quiet operation.

SEIS SHIMANO ELECTRONIC INTELLIGENT SYSTEM – The innovative SEIS shifting technology is based on Shimano INDEX SYSTEM (SIS), which has demonstrated its shifting performance over many years. The main difference is that shifting is carried out electronically rather than mechanically. Professional riders have extensively tested this electronic shifting system in a range of conditions, including rain, mud, low temperatures and bumpy roads, as well as combinations of these conditions. Shifting requires only the press of a button and no extra effort. This allows the rider to keep a firm grip on the handlebars and focus on riding rather than shifting. The system enables accurate, effortless shifting in challenging conditions, such as when hands are cold or the rider is completely exhausted. Shifting performance is not affected by dirty or stretched cables because the shifting signal is transmitted electronically. This results in smoother, more precise shifting. The control buttons work similarly to mechanical dual-control levers, so there is no need to reprogram the system.

E-TUBE – The system provides flexibility on the bike. E-TUBE transmits interactive signals and power to each component through a plug-and-play connection. E-TUBE does not rust, stretch or freeze and requires little maintenance. The SM-PCE1 connects the computer to the components to enable firmware updates.