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Buying a mountain bike requires looking for 21 speeds, solid front shocks and disc brakes that won't squeak or stop working in muddy or sandy conditions. Choose the right mountain bike, paying attention to the height of the frame, with information from an experienced cyclist and bike repair specialist in this free video on bicycles. Expert: John Murray Bio: John Murray is a bicycle sales and repair technician at FJ Rogers in Florence, Mass. Filmmaker: David Pakman