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Two friends that ride really well in tech stuff tried e-bikes and reported that the sudden surge of power, and more so the abrupt cessation of power, made for a lousy experience.
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I don't know if the difference is technique, or the smoothness of the Shimano system, but we ride technical stuff better, and often slower than on an old bike. With a bit of extra torque, you can take your time, look at a feature, and go over it, whereas without the assist, you need to bash in with some momentum.