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I'm just curious why Shimano hasn't come out with one. What are the technical challenged to doing so? I have seen the Di2 hacks online for mountain groups but Di2 has been out since 2008 or so and has trickled down to Ultegra but still no mountain.

P.S. I will not go create an account on mtbr just to ask this question so if you're about to complain that this isn't related to road keep in mind no one forced you to click on the link that *clearly* states what the question is going to be. :D
 

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As to why it hasn't come out already anyone's guess is as good as mine. I have read of pros still going with mechanical DA on cobbled races to avoid unwanted shifts when rattling over that type of terrain. It could be related to that - maybe figuring out how to eliminate unintentional gear shifts off road presents similar challenges.

There is also the economics to consider. Currently road bikes are a larger portion of the market, so hard to say how much effort goes into the MTB portfolio but now that 2x10 setups are pretty much the standard it seems like a good time for electronic drivetrain to take the market forward.
 

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If electronic shifting comes to MTBs, I wonder if anti-lock disc brakes could be far behind :)
No, No and NO!

Antilock brakes would suck. It's already bumpy enough on the trail. Now, you want to add something that will add more vibration? I'll pass.

Antilock brakes would just be a cover up for bad skills. Most hydro disk brakes have good modulation to help you prevent lockup.

Then again...........never underestimate a marketing plan that makes people think they "Need it"
 

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There is also the economics to consider. Currently road bikes are a larger portion of the market, so hard to say how much effort goes into the MTB portfolio but now that 2x10 setups are pretty much the standard it seems like a good time for electronic drivetrain to take the market forward.

Nahh. Mtb will get disk brakes before electronic shifting.
 

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my guess would be that the mountain bike environment is much harsher then the road, so they can't make electronics that hold up well with the dirt and dust. With racers going to XX1 in droves now and the suspension company's doing electric controlled shocks and forks I can see something happening soon in that department. But I think to get the pros on to electric drive-trains they will have to be really reliable. Unlike in road racing you cant get a new bike when something goes wrong. World cub XC is on short courses now and you just do a bunch of laps. Its really easy to fall behind when you have a mechanical.
 
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