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I disagree.. when di2 fails you can always get home, you're just stuck in the gear you're in..
but when your (mechanical) shifters explodes.. or your cable snaps, it's a lot harder to get your bike into a gear
Jaap-
your cable snaps, it's a lot harder to get your bike into a gear
A few turns of a limit screw and you can be in a rideable gear.
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Yes, that's fine if you're just on your Sunday loop but very problematic if you're stuck in the wilds where "home" is wherever you planned to get to for the night.
It's easy to replace cables and jury rig mechanical derailleurs to do what you need them to. Seems Di2 systems most commonly fail absolutely (front & back), leaving you rolling in whatever your last gear was, which in certain terrain and conditions is pretty much being stranded with a bike you're unable to complete your tour on. Stuck in 53 - 11 in the hills / head winds doesn't sound like fun (or workable) to me.
In the 8 years I've been riding road bikes I've never had a shifter explode, but that doesn't mean it doesn't happen. What I do know though is that a cable snapping < dead Di2 in terms of how it can ruin a long riding holiday.
rhb
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Yeah it's great until something like this happens http://www.bikeforums.net/road-cycling/1068175-di2-shimano-failures-caution.html
Unfortunately this sort of issue and anecdote seems to be far too common ...
Don't get me wrong, I'm not anti Di2 or eTap, just personally wouldn't want tech I can't fix without a laptop or warranty claim roadside