Shimano Ultegra 6870 Di2 Groupset

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Shimano Ultegra 6870 Di2 Groupset

The 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.

Concentrate on Performance

This 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.

Ultegra E-tube Platform

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.

Shimano Ultegra 6870 Di2 Groupset: Crankset

Ultegra FC-6800 Crankset Features

  • Ultegra FC-6800 Crankset
  • New 4-arm design for same stiffness with lighter weight
  • Hollowtech II construction
  • Hollowglide chainrings
  • 11-speed compatible
  • Same bolt circle diameter for compact and traditional double chainsets means that one crankarm fits all chainring sizes
  • Bolt circle diameter: 110mm
  • Chain line: 43.5mm
  • Includes Hollowtech II Bottom Bracket SM-BBR60 BSA
  • Weight: 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.

Shimano Ultegra 6870 Di2 Groupset: STI Levers

Di2 STI Dual Control Set ST-6870 Features:

  • Programmable multi-shift function
  • Extremely fast and precise shifting
  • Clean cabling thanks to E-Tube Connection
  • Low maintenance with long-lasting performance
  • Cable connection: EW-SD50
  • Carbon brake lever
  • Weight: 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.

Shimano Ultegra 6870 Di2 Groupset: Di2 Rear Mech

Ultegra Di2 Rear Derailleur RD-6870 SS Features:

  • Fast and accurate shifting
  • Automatic anti-crash mechanism, coupled in an emergency the cage from the motor
  • 11-speed design
  • Weight: 250g

Ultegra 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.

Ultegra Di2 Front Derailleur FD-6870 Braze On Features:

  • Programmed Auto-Trim function
  • The support screw provides a rigid platform to which the derailleur can be supported on the large chainring when transporting the chain
  • Fast, quiet and accurate gear changes
  • Chainstay Angle: 61-66°
  • Max Chainring: 46-53t
  • Chain line: 43.5mm
  • 2-speed
  • Mounting: Braze On
  • Weight: 155g

Ultegra 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.

Shimano Ultegra 6870 Di2 Groupset: Brake

Ultegra Brake Set BR-6800 Features:

  • New SLR EV Technology
  • 10% more power than BR-6700
  • Smooth and light operation with increased modulation
  • Brake Pad Types: R55C4
  • Weight: 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.

Ultegra Cassette CS-6800 11-25T Features:

  • Rider-tuned means Ultegra works the way you want it
  • Weight: 212g

Shimano Ultegra 6870 Di2 Groupset: Cassette

Ultegra 11-speed Chain CN-6800

The new symmetrical Ultegra 11-speed 116 link chain offers low weight and high durability.

Ultegra 11-speed Chain CN-6800 Features:

  • Ultegra redesigned SIL-TEC Chain for 11-Speed
  • Weight: 253g

Di2 Battery SM-BTR2-1

This Di2 Battery can last up to 2,000km on a full charge, which takes just 90 minutes. Powered by a lithium ion battery, this Di2 Battery is just 50 grams.

Di2 Battery SM-BTR2-1 Features:

  • For built-in installation in the frame or seatpost
  • High-power lithium-ion battery
  • Long battery life (up to 2,000km when fully charged)
  • The charging time for completely discharged battery is just 90 minutes
  • Battery: Lithium Ion
  • Nominal capacity: 500 mAh
  • Operating temperature range:
    • During discharge: -10°C bis 50°C
    • During charging: 0°C bis 45°C
  • Nominal voltage: 7.4V
  • Weight: 50g

Bike Sizing Guide

Choosing the bike size depends on the type of bike, your height, your riding style, and your preference. A correct fitting bike will be more comfortable, more efficient and more fun to ride. This bike size guide gives our customers general advice on choosing the right size. It is a guide only and we always recommend visiting one of our stores or contacting one of our experts from our contact us page.

To get started, think about your style of riding, measure your height and use the links above for sizing on relevant bike types.


Measure your height

To find the correct sized bike you will need to measure your height and your inside leg. For your height, stand against a wall and mark the wall with a pencil so it's level with the top of your head. Then measure from the ground up to the mark (having someone to help might make this easier). For your inside leg measurement, stand against a wall and using a book hold it in between your legs into your groin and make sure it's flat against the wall. Measure the height from the book to the floor. (Again it might be easier to get a friend to help). If your height is on the cusp of the size range, your reach is often the deciding factor in which size to go for. To find out if you have short or long reach you will need to measure your ape index. This is your arm span minus your height. If you have a positive ape index then go for the larger size, or if you have a negative ape index go for a smaller size.


The type of bike

What type of bike you choose will affect the bike size you buy. The type or style of riding that you do will also affect which size you need. For example a mountain biker that wants to ride more aggressively and would like a more manoeuvrable bike may prefer a size smaller than they would normally take. Likewise a cross country racer that is looking for a flatter and speedier mountain bike may prefer a size larger than they would normally take. There is no definitive right or wrong size, it all comes down to personal preference and what feels comfortable. The different types of bikes are all explained within our buying guides.


How are bikes measured?

Bikes are measured by their seat tube length. This measurement is normally from the centre of the bottom bracket (BB) or the centre of the bolt that attached the crank arms. This differs by brand, some measure to the top of where the top tube meets the seat tube, or even the centre of the top tube. Mountain bikes are either measured in inches or descriptive sizes (small, medium etc). Road bikes are in centimetres or descriptive sizes where as Hybrid bikes can be any one of the three. Bikes also get longer as they go up in size (relative to the frame size) but different brands can be inherently longer or shorter than others.


Stand over height

Stand over height is how tall the frame is from the ground. Stand over height measurements are to the top of the top-tube. Ideally you want at least 2cm of clearance between you and the frame. In theory your stand over height is your leg measurement minus 2cm. It it worth measuring your inside leg with your shoes on so you can establish your stand over height. Should you need to jump off the saddle quickly, the clearance between you and the frame will prevent any injuries.

This handy chart should show you the right size of MTB you need based on your height. Measure your height accurately and check the manufacturer’s measurements too. You can also visit us in store to speak to an experienced member of staff.

Rider Height Suggested Mountain Frame Size
Feet & Inches Centimetres Frame Size (inches) Frame Size (cm) Frame Size
4'10" - 5'2" 148cm - 158cm 13" - 14" 33 - 37 View all X-Small Bikes
5'2" - 5'6" 158cm - 168cm 15" - 16" 38 - 42 View all Small Bikes
5'6" - 5' 10" 168cm - 178cm 17" - 18" 43 - 47 View all Medium Bikes
5'10" - 6'1" 178cm - 185cm 19" - 20" 48 - 52 View all Large Bikes
6'1" - 6'4" 185cm - 193cm 21" - 22" 53 - 57 View all X-Large Bikes
6'4" - 6'6" 193cm - 198cm 23" - 24" 58 - 61 View all XX-Large Bikes

Shop All Mountain Bikes

This handy chart should show you the right size of road bike you need based on your height. Measure your height accurately and always check the manufacturer’s measurements too. You can also visit us in store to speak to an experienced member of staff.

Rider Height Suggested Road Bike Size
Feet & Inches Centimetres Frame Size (cm)
4'10" - 5'0" 148cm - 152cm XX-Small (47cm - 48cm) View all XX-Small Road Bikes
5'0" - 5'3" 152cm - 160cm X-Small (49cm - 50cm) View all X-Small Road Bikes
5'3" - 5'6" 160cm - 168cm Small (51cm - 53cm) View all Small Road Bikes
5'6" - 5'9" 168cm - 175cm Medium (54cm - 55cm) View all Medium Road Bikes
5'9" - 6'0" 175cm - 183cm Large (56cm - 58cm) View all Large Road Bikes
6'0" - 6'3" 183cm - 191cm X-Large (58cm - 60cm) View all X-Large Road Bikes
6'3" - 6'6" 191cm - 198cm XX-Large (61cm - 63cm) View all XX-Large Road Bikes

Shop All Road Bikes

Additional information


XS, S, M, L, XL, XXL


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