With technology trickling down from flagship Dura-Ace, Shimano's Ultegra R8150 Di2 Groupset is better than it has ever been before. It perfectly balances performance with value, and the components are slick, reliable, and only create a minimal weight penalty compared to Dura-Ace.

Shifting is flawless, and faster than previous iterations, while operating almost silently. This is thanks to Hyperglide+ tooth profiles, meaning that the chainrings and cassette have an improved connection with the chain, essentially improving shifting under load, across the cassette. Adding in a 12th sprocket, progression through the gears is smoother too.

There are plenty of configurations to choose from, including various crank lengths and both mid-compact and compact chainrings, making this groupset a fantastic option for the majority of riders looking to upgrade their bike to an electronic system. 

You can also pair the system with most third-party cycling computers, including Garmin and Wahoo, which allow you to monitor gear selection or battery status. 

Product Availability & Shipping Disclaimer

Please be aware that some parts are stored in supplier warehouses. As a result, shipping times may vary depending on stock availability. If you require this product within 7 days of ordering, we strongly recommend requesting an estimated stock arrival before purchasing. Contact us at servicecourse@saintpiran.co.uk for further details.

The Groupset comprises of:

ST-R8150 Shifters

• NOT wireless - (the required cables and junction box are included in the groupset)
• 2x12-speed Dual-Control lever
• Refined hood for improved ergonomics and aerodynamics
• Improved button access

FC-R8100 - HOLLOWTECH II Crank Set - 2x12-speed

• Chainring combinations:  - 52-36T or 50-34T

CS-R8100 Cassette - 12-speed, 11-30T or 11-34T

• 11-tooth small cog for optimal efficiency
• Optimized “Sweet Spot” Gears for pedalling efficiency
• Compatible with 11-speed HG freehub bodies
• 11-36*T cassettes (CSHG710) available as an option - call for availability

RD-R8150 Rear Derailleur

• SHIMANO SHADOW Rear Derailleur
• Integrated D-FLY connectivity
• 12-speed Di2 technology
• Compatible with 11-30, 11-34 and 11-36*T cassettes (*available as an option - call for availability)

FD-R8150 Front Derailleur

• 12-speed Di2 technology
• Fast, precise front shifting

BR-R8100 Brakes

• Exceptional balance of rigidity, weight and stopping power
• Maximum tyre size: 28C

KMC X12 Chain with Quick Link

Shimano Battery, Charging Cable and Electric Wires

This groupset comes complete with a Shimano E-Tube SEIS Di2 battery, charging cable and EW-SD300 E-Tube Di2 Electric Wires.

• E-Tube SEIS Di2 Battery, 7.4V Lithium-ion, 3-ports for SD300 wires, internal mount
• EW-EC300 Charging Cable,1700mm
• EWJC302 - 2 port junction
• EW-SD300 E-Tube Di2 Electric Wire, 550mm - left Shifter to cable junction
• EW-SD300 E-Tube Di2 Electric Wire, 550mm - right shifter to cable junction
• EW-SD300 E-Tube Di2 Electric Wire, 950mm - battery to front mech
• EW-SD300 E-Tube Di2 Electric Wire, 1200mm - battery to rear mech
• EW-SD300 E-Tube Di2 Electric Wire, 1400mm - battery to junction cable

PLEASE NOTE, THIS GROUPSET DOES NOT CONTAIN:

• Bottom Bracket

PLEASE ALSO NOTE: Unlike the disc brake version, the 12s rim brake shifters still use WIRED connections to the battery and derailleurs.