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Mountain bikes make for awkward e-bikes. If you’re climbing uphill and turning the bike to avoid rocks or trees, for example, pressing the electronic “burst” can be scary or even dangerous. So Trek built a new engine for its Fuel EXe electric mountain bike that provides smoother and more granular e-boosts. It’s also quieter, lighter, and 20% smaller than a typical e-bike motor. The Fuel EXe looks, feels, and sounds like a traditional mountain bike, so you don’t even have to tell your friends you’re getting a boost.

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