The Woom Up is an e-bike built for kids ages 7 to 14 years old with a starting price of $3,599. That is undeniably a lot to spend on a kid’s hardtail mountain bike, motorized or not. But you do get what you pay for. With three levels of pedal assist up to 12 mph, the bike can make those long rides with kids painless — and with fewer complaints. 
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