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Amazon.com : Mongoose Flatrock Boys and Girls Hardtail Mountain Bike, 24-Inch Wheels, 21 Speed Twist Shfters, 14.5-Inch Lightweight Aluminum Frame, Blue : Sports & Outdoors
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Amazon.com: Gylbuz 3x7 Speed Bicycle Twist Shifter 21 Speed Bike Shift Lever and 1 Pair Non-Slip Rubber Handle Bar Grips for Mountain Bike, (GY-SFT70R7-set) : Sports & Outdoors
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Jetson Bolt Folding Electric Ride-On with Twist Throttle, Cruise Control, Up to 15.5 mph, Black - Walmart.com
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