Powerfly 4 is our most affordable electric mountain bike. This e-MTB is built with parts that hold up, like a dependable 9-speed Shimano drivetrain, a 100 mm suspension fork, fast-rolling wheels & a Bosch Performance CX motor that assists up to 15.5 mph. This bike expands your boundaries & lets you travel to destinations that you never thought youd reach on a mountain bike. This bike expands boundaries: the top-notch Bosch system is equally suited to commuting, recreation & a ridiculously fun time on the trails The proven Bosch electric-assist system is natural & intuitive, & makes you feel like you have super-charged legs This bike is built for the long-haul: it comes with a 500 Wh battery, the longest-range available from Bosch