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no..
Was on the Grand Ballon (in France) with a friend, his rear derailleur failed thanks to a wire that got damaged.. Swapped some wires within in the system, and he continued as normal.
I had a rear wheel come of my bike (horrible Zipp QR malfunctioned, yes the model that was recalled) and landed on my rear derailleur. This would normally snap the cable on mechanical models, in my case just the rear derailleur stopped working (front was still fine). Then just unplugged the battery and plugged it back in and all was working again.
So no, Di2 malfunctions hardly ever mean nothing works and if one of the wires becomes damaged you can easily swap it with one of the other wires, without having to do any adjusting or tensioning afterwards.. And you can also bring a spare wire, or even a junction box or battery. Since they are tiny..
If all of the above fails, you can always just push di2 derailleurs into the gears you like. They'll stay there quite happy, no weird cable rigging needed.
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Something like this: http://www.bumm.de/de/produkte/stromversorgung.html
But I think it's a really smart choice going di2 for bike packing. Di2 requires a lot less effort to shift, needs far less adjustment of your gears and you can easily do 3000km on a charge. In the 2 years I've used di2 I have never had any malfunction..
And if you're going to go further than 3000km without a charger, than you can easily carry an extra battery or two.. They're only 56gram!
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http://instagram.com/talbot_frameworks
@Batt di2 batteries are a lot smaller than you think
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Hi! Thanks for your concern, however I do think it's a bit out of place. This is the second disc fork I made from an old steel fork and the first didn't fail in the 2 years I used it.
This fork however is a lot better made than the first. I used a much lower current (±25 amp) to keep the heat down, which made it difficult to really get a puddle going on the forks.. But kept temps lower than my first fork. I also used a much longer disc mount this time, allowing a longer weld (done in 2cm welds with cooling in between), spreading the loads and creating lower forces through a longer arm.
And the Avid caliper I'm using in front is the most horrible disc brake ever made.. I think a badly set up canti has more braking force ;)
I could go on for a while about the work I put into it, but if you want to talk nerdy with me you could send me a PM.
Thanks for taking the time and expressing your concerns though!


some people did the transcontinental with di2. Although I have to admit, this was with pedals:
https://www.instagram.com/p/BIx9eOXhCwW/?taken-by=thetranscontinental