Di2 parts list What do I need?

Be aware some upgrade kits
Be aware some upgrade kits from bike24 do NOT come with wires.

Is this for a road bike or a TT bike ?

Merlin cycles are currently selling the upgrade kit for £599.99

http://www.merlincycles.com/shimano-ultegra-6870-di2-gear-kit-74063.html?utm_campaign=googlebase-GB&utm_source=googlebase&utm_medium=shopping&utm_term=Road+Bike+Electronic+Components&gclid=CMiq8uq2iMcCFSgGwwodSWwF1w

But it only comes with a 3 port junction A box. I think for a TT bike you need the 5 port junction A box. Which you will need to buy separately.

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If you want to buy everything separately this is what you will need

Ultegra 6870 or DA9070 Di2 Shifters (6770 shifters also work but require an update (i think), 7970 shifters do not work)
Ultegra 6870 or DA9070 Di2 Front derailleur
Ultegra 6870 or DA9070 Di2 Rear derailleur
3 or 5 port junction Box. SM-EW90-A or SM-EW90-B
Junction box B – SM-JC41
Internal Battery – SM-BTR2
Battery charger – SM-BCR2 – This doubles as a pc interface to customize settings,and update the firmware. And can only be used with an internal battery.

Di2 plug tool – To insert and remove the wires

2 shifter e-tube wires (350mm each) EW-SD50 – for 42,44cm bars. If you have 46cm bars get longer.
1 downtube e-tube wire (1000mm or more) EW-SD50
1 battery e-tube wire (500mm) EW-SD50
1 front derailleur e-tube wire (300mm) EW-SD50
1 rear derailleur e-tube wire (600mm) EW-SD50

These above are typical cable lengths for a small to medium frame. If you have a large or bigger frame you should buy a longer downtube wire.

The bar end shifter come with
The bar end shifter come with built in cables.

if your going internal
if your going internal battery then the charger also doubles up as a firmware updater it cant be used for diagnostics as that requires a separate unit but you would only need that if you ever have a fault

look on ribble’s website at the electric gearset kit in the groupset section as this will list everything you will need and they have drop down menus so you can select a 3 or 5 port junction box, internal or external battery etc….

Also its well worth looking at some of the german bike shops like discount.de or bike.24 as they also just sell the gear kits and with the exchange rate at the moment you can save quite a bit of money, just be aware that if u have any warranty issues you will prob have to return the affected component back to germany for it to be fixed/replaced

You need a five way junction
You need a five way junction box for the handlebar stem. Will need a programmer(or borrow )to set it all up upgrade firmware/diagnostics

Battery, rear derailleur, front derailleur, levers and cables to connect them all together