What Our Gearhead(R) Experts Are Saying: "The P-Series Ultegra Di2 strikes the perfect balance-ultra-fast Di2 shifting, aero frame with smart storage, and efficient Reserve wheels. It delivers pro-level performance at a triathlete-friendly price."We choose the Cervelo PSeries Ultegra Di2 when aerodynamic efficiency, storage, and mechanical precision converge. Its carbon frame, inspired by the P5, favors drag reduction while offering adaptable fit via a Dsteerer and round-stem interface. Internal cable routing, increased tire clearance, and integrated storage under the downtube ensure everything stays clean and functional between T1 and T2. Shifting is sharp and reliable, powered by Shimano's 12speed Di2 Ultegra R8150 system with 52/36T crankset and an 1130T cassette. Rolling on Reserve 57 and 64 carbon wheels with Vittoria 700x29c tires-this machine saves watts and keeps you steady. Fuel and tools stay within reach through Smartpak 400, rear hydration mount, and in-frame compartment. Heads upWe do our best to keep bike specs and images current, but occasional component changes can happen without warning-and sometimes the photos might not show the exact build you'll receive. If you want to doublecheck the details, our Gearheads are always here to help.