Why Don't EMTBs Use the Shimano Alfine Internal Geared Hub?

R120

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Because the hub won't take the abuse of riding off road - plenty of E-Bikes use the Alfine, but they are commuter bikes.

Rolhof make a hub gear system that is suited to off road use, and there are some bikes using it, such as the Geometron E-Boxx

Nicolai release 14 speed EBOXX E14 - EMTB Forums

Realistically though for aggressive mountain biking a hub gear adds a lot of weight exactly the you don't want it, and I for one would not want one - for commuting it would be my first choice.
 
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