Jamis Sonik Track Bike Size Small (they call this a 51. It has a sloping top tube. The center of the bottom bracket to the center of the top tube measures 45cm. Top tube measures 52cm) Frame is Aluminum, Fork and seat post are carbon. FSA Carbon 165mm crankset and BB. Wheels have Mavic CXP33 Clinchers, Hubs are Miche. The wheels have never been crashed and have only been used on an indoor track. Includes 49 and 50 tooth chainrings and 16 and 17 tooth cogs. Fixie/fixed gear/single speed.