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Amazon.com : Mongoose Flatrock Boys and Girls Hardtail Mountain Bike, 24- Inch Wheels, 21 Speed Twist Shfters, 14.5-Inch Aluminum Frame, Blue : Sports & Outdoors
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Fastest tyres for mountain biking: we test 2.3in, 2.6in and 2.8in tyres against the clock - BikeRadar
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