We understand that putting together an entire Ultegra Di2 component group from ground up can be a daunting task, so we put together this upgrade kit to offer you the essential components needed to upgrade your current bike to Ultegra Di2. In short, these are the core Ultegra Di2 parts to be installed while using your existing crankset, bottom bracket and brake calipers.
Reliable and proven Di2 technology makes it way to Ultegra for incredibly easy and very precise shifting. Di2 shifters send a signal through wires to small motors built into the derailleurs so there is no straining to pull a cable or relying on spring tension. All the buttons are in the same location as the standard STI levers so the learning curve is virtually nonexistent. The buttons require a light touch and only 2mm of movement for perfect shifts every time. Di2 shifters are as soft as perhaps a mouse click and can be a huge benefit for anyone with hand issues like arthritis or carpal tunnel.
The best thing about Ultegra Di2 is you get Dura-Ace Di2 performance at about half the price. A lot of this is thanks to the technology trickle down combined with the usual fast-paced improvements in technology and electronics. The well-proven, reliable Dura-Ace Di2 has been out for several years so Shimano had much of the R&D already nailed. Ultegra Di2 is slightly heavier due to some different materials being used such as alloy brake levers instead of carbon and the motors located in the Ultegra Di2 derailleurs are slightly bulkier and heavier. There is virtually no difference in the speed of shifting and functionality.
In fact, the wiring used for Ultegra Di2 uses smaller 2 core wires instead of the 4 core used on first generation Dura-Ace. The Ultegra Di2 wires are lighter with smaller connections so there are smaller holes required in the frame for internal routing. Connections on the Ultegra Di2 are water tight without the requirement to install a shrink wrap seal like on Dura-Ace Di2.
Upgrade kit includes:
Please note, we will send a braze-on front derailleur, 300mm, 350mm, 550mm 850mm connecting wires and a external junction box. If you want an internal junction box or different length connecting wires, please call or make a note in the comments box toward the end of the online order form.
Put these on my 'cross bike. Major positive change. Yeah, if you crash, you can still drop a chain (I did this). But, otherwise every shift is crisp and without worry that it will go awry. And, the front shift is as easy as the rear (I'm an old man with arthritic thumbs, and that climb to the big ring was painful and slow). No cable stretch to account for, no gummed up cables. (You can still gum up the derailleur itself with mud, and rip it off, as one of my competitors demonstrated expensively at Valmont.) During races when I previously would have ground it out in the wrong gear - especially, not shifting up to the big ring on fast sections - this makes it much easier to make the right choice. Only drawback is the inability to fire off 3 or 4 clicks and have the derailleur move progressively through the gears - you can't click again until the first shift has completed. Works fine even with big gloves.
Pros: Solid shift, every time without pain or fuss
Cons: Inability to do multi-cog shifts without waiting