Shimano's Ultegra Di2 electronic shifting system is far too tempting to resist. It delivers the precision and consistency of the Dura-Ace Di2 group to a far more affordable price point. If you've got a Shimano equipped bike and want to make the switch to electronic shifting, we've assembled all of the parts and pieces that you'll need right here in our Ultegra Di2 Upgrade Kit.

Dual Control Levers:ST-6770-R/L(2x10-speed)

Features:
• Lightweight levers for optimal comfort and control
• Digital push button shifting – like clicking a mouse
• Ergonomically designed hood shape
• Lever reach adjustment – fits all hand sizes
• Weight: 313 g (pair)

Rear Derailleur: RD-6770-SS

Features:
• Programmed electronic shifting – fast and accurate
• Never drops out of alignment
• Crash saver function
• Inner cage impact protection – cage moves automatically inwards on impact
• Max. rear sprocket: 28T for wide-range gearing
• Weight: 270 g

Front Derailleur: FD-6770F

Features:
• Fast, accurate, smooth shifting
• Programmed, automatic trim – silent shifting
• Weight: 162 g

Battery pack:

• Model: SM-BTR1-A. Li-Ion battery with 1-1.5 hours quick charge.
• 7.4V rechargeable lithium ion battery - easily mounted to the frame and removed for charging.
• Claimed to last up to 625 miles with frequent use, battery will hold its charge for months.
• Gives a low reading when a charge is needed.
• Weight 68g.

Charger unit and cable:

• Charger model: SM-BCR1. (100~240V AC 50/60 Hz)
• Charger cable: SM-BCC1-8(Type-A)110~120V
• Electric internal cable SM-JC40 Set/M size (External wire routing)
• Electric Cable (2 - Junction Wire) SM-EW67A-E