With an upgraded the 350 watt Bosch motor, the Bulls Monster EF S is one of the best fat tire bikes on the market. Add that to a 400 watt hour motor and you've got a great ride. Enjoy a smooth ride even over the rockiest terrain. In addition to the big tires, you get full suspension from Rock Shox. Choose from four levels of assist: Eco, Tour, Sport, and Turbo. This lets you customize your ride and choose how quick you want to get to the max assisted speed of 20 mph.
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