At only 935 grams in a 56cm frame, Cervelo has created the lightest frame we offer. Cervelo has engineered unique tube shapes to balance the different demands of out-of-saddle sprinting or climbing, descending, and ride quality. The resulting tube shapes of the R3 are very unique and every shape on this frame, from the Squoval downtube to the super slim seatstays, is driven by the engineering focused on optimizing the STW ratio. The slim seatstays of the R3 not only help achieve this incredible STW ratio, they also provide one of the highest vertical compliance scores ever measured. So with regards to torsional & bb stiffness and vertical compliance, you can have your cake and eat it too. Features: - Squoval chainstays & downtube optimized for the highest possible stiffness-to-weight ratio (STW) - Multi-shape toptube-Squoval near the headtube and seattube and oval in the center section - Oversized bottom bracket area provides stiffness for climbing and sprinting - Lay-up optimizatio