Shimano Ultegra 6870 Di2 GroupsetThe highest quality groupset outside of the professional peloton, Shimano’s Ultegra 6870 Di2 Groupset offers crisp, accurate, and reliable shifting at a fantastically light weight. This Shimano Di2 option will be an excellent addition to the aspiring racer or to the rider who just enjoys optimal performance Ultegra 6870 Di2 Groupset: Concentrate on PerformanceThis Ultegra 6870 Di2 series features “pro proven” electronic shifting, a direct trickle down from its big brother, Dura-Ace. Featuring 4-arm cranks, an 11-speed cassette, dual pivot brakes and a Sil-tec chain, this Shimano Di2 groupset uses an electronic shifting system to let you reap the benefits of supreme shifting so you can keep your concentration where it’s needed – on the road ahead E-tube:The Ultegra 6870 products are based on the E-tube platform. They can be adjusted with the dedicated E-tube (project) software. E-tube is Shimano’s electronic shifting program that lets you customise shifting functions. Besides customisation, E-tube offers the possibility to upgrade components with firmware upgrades after the point of purchase. With E-tube compatibility you can include other shifting functions like Roubaix shifters or Dura-Ace sprint Ultegra FC-6800 Crankset:With a unique four-arm spider and Hollowtech II construction putting strength just where it’s needed, the FC-6800 chainset sets new standards for stiffness and low weight Ultegra FC-6800 CranksetNew 4-arm design for same stiffness with lighter weightHollowtech II constructionHollowglide chainrings11-speed compatibleSame bolt circle diameter for compact and traditional double chainsets means that one crankarm fits all chainring sizesBolt circle diameter: 110mmChain line: 43 5mmIncludes Hollowtech II Bottom Bracket SM-BBR60 BSAWeight: 775g (with BB)Di2 STI Dual Control Set ST-6870:Dual Control Levers with new ergonomic design for long rides and fast accurate electronic shifting. Compared to the previous Ultegra Di2 (6770) Shimano has improved the ergonomics of the dual control lever for easier access. Especially on top of the “slimmer” hoods riders have more control than ever. Also the shape of the shift button is improved and the contrast of the surface is more recognisable Programmable multi-shift functionExtremely fast and precise shiftingClean cabling thanks to E-Tube ConnectionLow maintenance with long-lasting performanceCable connection: EW-SD50Carbon brake leverWeight: 295g (Set)Ultegra Di2 Rear Derailleur RD-6870 SS:The derailleurs are more compact and lighter than their predecessors. The rear derailleur is updated with an automatic protection system that moves the cage out of harm’s way in case of a crash. With a single press and hold of the shift button the rear derailleur goes all the way up or down the cassette. Or, when programmed at the E-tube platform, two or three gear shifts. Also the speed of gear shifts can be adjusted. In five steps, from very slow to very fast Fast and accurate shiftingAutomatic anti-crash mechanism, coupled in an emergency the cage from the motor11-speed designWeight: 250gUltegra Di2 Front Derailleur FD-6870 Braze On:Smooth shifting is guaranteed with the Ultegra Di2 Front Derailleur, thanks to a microchip communication link with the gear levers. What’s more, shifting the rear derailleur automatically trims the front derailleur Programmed Auto-Trim functionThe support screw provides a rigid platform to which the derailleur can be supported on the large chainring when transporting the chainFast, quiet and accurate gear changesChainstay Angle: 61-66°Max Chainring: 46-53tChain line: 43 5mm2-speedMounting: Braze OnWeight: 155gUltegra Brake Set BR-6800:Long, fast descents demand confidence. Ultegra brakes deliver, with a new symmetrical dual pivot design and twin bearings reducing pivot friction and improving efficiency and controllability New SLR EV Technology10% more power than BR-6700Smooth and light operation with increased modulationBrake Pad Types: R55C4Weight: 335g (set)Ultegra Cassette CS-6800 11-25T:The extra sprocket on this new Ultegra cassette will be a welcome addition for riders seeking wider ratios Rider-tuned means Ultegra works the way you want itWeight: 212gUltegra 11-speed Chain CN-6800:The new symmetrical Ultegra 11-speed 116 link chain offers low weight and high durability Ultegra redesigned SIL-TEC Chain for 11-SpeedWeight: 253gDi2 Battery SM-BTR2-1:For built-in installation in the frame or seatpostHigh-power lithium-ion batteryLong battery life (up to 2000km when fully charged)The charging time for completely discharged battery is just 90 minutesBattery: Lithium IonNominal capacity: 500 mAhWeight: 50g standardOperating temperature range:During discharge: -10°C bis 50°CDuring charging: 0°C bis 45°CNominal voltage: 7.4V***Internal battery holder needs to be purchased separately as the type of internal battery holder can be specific to some models of frames***Di2 Electric Wire Set SM-JC41L2 L-Size Internal Wire Routing:1x Electric wire EW-SD50I (1200mm)1x Electric wire EW-SD50I (1000mm)1x Electric wire EW-SD50I (700mm)1x Electric wire EW-SD50I (300mm)1x Junction 3 Ports SM-EW90-A1x Junction Box SM-JC41 internalOperation requires additional EW-SD50I cables and we suggest measuring the exact wire lengths that your frame requires. As all frames will require a slightly different setup, click HERE to see an example of the frame sections you should be measuring to ensure correct fitting Please note that this groupset does not come supplied with outer cables.A 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.