Great road bike! Cannondale carbon/aluminum frame. Ridden less than 600 miles. Sizing runs long on this frame it is a 51cm but fits like a 52-54cm. I used this smooth ride for a century ride and have not ridden it since. It is a great bike all levels, at a great price. No low ballers please, this is a high quality bike at a fair price. No better holiday gift than a Cannondale! Cannondale Six 6 Bicycle Type Road race & triathlon Weight Unspecified Sizes 51cm Colors Patriot Blue Frame & Fork Frame Construction TIG-welded/bonded Frame Tubing Material Aluminum, carbon stays Fork Brand & Model Cannondale Six Ultra Carbon Fork Material Carbon fiber/aluminum steerer, aero crown Rear Shock Not applicable Components Component Group Shimano Tiagra Brakeset Tektro R520 Dual Pivot brakes, Shimano Tiagra STI levers Shift Levers Shimano Tiagra STI Front Derailleur Shimano Sora Rear Derailleur Shimano Tiagra Crankset Shimano Tiaga, 39/53 teeth Pedals Not applicable Bottom Bracket Shimano Tiagra BB Shell Width Unspecified Rear Cogs 9-speed, 12 - 26 teeth Chain Shimano Nine Speed Seatpost Cannondale C2 Carbon-wrapped Saddle San Marco Ponza Power Handlebar ControlTech Elite compact Handlebar Extensions Not included Handlebar Stem Cannondale C4 Headset Integrated Wheels Hubs Cannondale C3 Rims Mavic CXP 22, 32-hole Tires 700 x 23c Maxxis Fuse Spoke Brand DT Swiss Competition Spoke Nipples Unspecified