Sierra BMW / Sierra Bicycle Supply offers the complete line of Specialized Bicycles and Turbo Pedal-Assist Electric E-Bikes. Authorized Specialized Dealer. Parts, Sales, Service, and Equipment - Frames, Batteries, Wheels, Saddles, Handlebars, Helmets, Clothing, Jerseys, Shoes, Shorts, Gloves, Tires, Pumps, Lights.