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Di2 cable length - Spec tarmac
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I'm trying to figure out the correct Di2 cable lengths for a 58cm Spec Tarmac.
I found this on the Specialized website: http://service.specialized.com/...df/0000039491_R1.pdf

Some of those lengths are confusing....Why would I need 500mm for FD?
And why 1000m for a seatpost mounted battery?

I'll be using EW-RS910 bar end junction box and run the cable from the EW-RS910 to one shifther, then to the other shifter and then a long cable to junction box B.

So far I got it as:

EW-RS910 to R Shifter = 400mm (350 might be enough)
R Shifter to L Shifter = 700mm
L Shifter to junction box B = 1400mm
JB B to FD = 350mm
JB B to RD = 700mm
JB B to battery (seatpost) = 700-800mm (seat tube length is 522mm, so this gives me 180-280 mm extra)

Am I missing something?
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Re: Di2 cable length - Spec tarmac [lazybiker] [ In reply to ]
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Looks pretty good. Do you want D-Fly (EW-WU111 Wireless Unit )? If so, you could put that in-line between the cockpit and frame. So, it would greatly shorten the L-Shifter wire, and then you could shorten the remaining length from the D-Fly to the Junction B.
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