Thread: Di2 advice
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Old 01-18-15, 06:15 PM
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trailflow1
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Hi, Can you be more specific of which kit you are looking to buy - Dura Ace 7970, Ultegra 6770, Ultegra 6870, Dura ace 9070 ? and is it internal or external wiring/battery ?

If you plan to go internal wiring/battery with (6770, 6870, 9070) then 6 EW-SD50 (e-tube) cables are needed. These need to be the correct length which will depend on your frame size. Its best to measure each section with a tape measure against your frame. Remember to account for any slack you may need.

2 shifter cables (350mm each)
1 down tube cable (around 1000mm or more)
1 battery cable (around 700mm) edit should be 400mm
1 front derailleur cable (around 500mm) edit should be 300mm
1 rear derailleur cable (around 550mm)
Junction A box
Junction B box

If your frame is internal routing compatible, the Junction B box can go inside the bottom bracket provided there is cut outs inside to hide it in the frame,and it is accessed through the bottom bracket (by removing the crank). If you plan to go external wiring you can certainly cable-tie the Junction B box under the chain stay. But it will be more exposed to water/dirt. There may be a better place to put it. Like near the front derailleur or battery. It all depends on how much slack cable you will have.


AFAIK Dura Ace 7970 uses a different system to E-tube wires and is not compatible,and is seperate from (6770, 6870, 9070)

Last edited by trailflow1; 01-18-15 at 11:34 PM.
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