Brucey wrote:Perhaps a computer expert would consider that 'miraculous reliability' but from where I'm sitting it is rubbish.
Computers in general are stunningly reliable. Every car, motorbike has several. Aircraft have many tens of them and most folks houses probably have dozens to hundreds, the vast majority are completely trouble free far outlasting the devices they're fitted to.
DI2 is a consumer product, no idea what the actual system the pros use but I bet it's trimmed weight wise down to nothing.
The failures are almost certainly likely to be failure of the mechanical bits rather than the electronics and probably related to the weight saving.
Look at how often F1 cars fail compared to the consumer car fleet.
Of course bicycles are inherently simple, we accept their mechanical limitations because they're "easy to fix" and we'd continue along that path even if the MTBF of computer controlled gears was longer than the life of the bike - because "well if it fails I can't fix it".
I've built a new commuting e-bike based on my ideas of why my old tourer was a bit crap.
With close to 1000 miles a month and little time to properly service it (other than squirt oil at it) I went the hub gear route so I can get the chain tracking right, use 1/8th chain, fit proper chain guards - and I also fitted DI2.
Now I'll admit it's an experiment, but transmission issues for that sort of mileage particularly in the winter with little servicing are often enough - even if it's just a clobbered chain, worn derailleur or knackered cables.
Certainly the DI2 makes for positive gear changes and my hope is that the positive engagement and guaranteed aligned gears will counter the combined energy of both me and the motor and reduce wear on the hub.
As I said, it's an experiment but if it works as I hope then it'll be a step towards a (e)bicycle which makes a decent long distance commuter.
IME that's the biggest problem with bicycles, over middle distances they're just not that reliable and require far too much servicing.