Cervelo built the S5 Ultegra Di2 around a reworked carbon frame that trims drag and weight from the outgoing S5, with the biggest gains concentrated at the fork and head tube. Shimano's Ultegra Di2 groupset brings electronic shifting and a wide 11 to 34 tooth cassette to the build, so climbs and pace changes stay covered without a mechanical cable to maintain. The one-piece bar and stem carries that same aero focus into the front end, cutting bulk without adding extra hardware to dial in fit. What Our Gearhead(R) Experts Are Saying:"Three hours into a long ride, the Ultegra Di2 still shifts exactly the way it did in the first mile. I never have to think about cable stretch or a derailleur that's drifted out of tune partway through the day."Heads up! We 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 double-check the details, our Gearhead(R) Experts are always here to help.