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I've seen one of those companies that convert one of the electronic groupsets to run a fully automatic gear change.
Would you want it on your bike?
My opinion;
road bike YES
mountain bike NO
No
No why would you? Loads more stuff to improve performance than auto changes IMHO
Neither. How would it know what your comfortable power / cadence output would be throughout the ride? It's ok with an engine - you know at 2500 rpm @ 30% throttle it'll take gear x.
I can't see how that can work on a bicycle.
As hot-fiat says how would it no when to change gear.
You can cycle at 40rpm or 85rpm but still be comfortable. What if you want to spin a low year quickly to help up a step climb but the bike then decides to change up a gear but then you can't peddle the next gear ratio?
Too many variables I'm afraid.
road bike - shit idea
mtb - ludicrously shit idea