What Our Gearhead(R) Experts Are Saying:"The S5 Ultegra Di2 is all about pure speed-Cervelo's iconic V-stem and Bayonet fork are instantly recognizable at the front of the pro peloton, and this latest version is even faster and lighter. The Ultegra Di2 drivetrain is crisp and reliable, the Reserve wheels are lightning-quick, and every detail is about turning watts into wins. This is the bike I'd reach for when the goal is to drop the pack and chase the podium."We chase every marginal gain with the Cervelo S5 Ultegra Di2, and the result is a bike that's unapologetically fast. Cervelo's legendary V-stem and Bayonet S5 fork slice through the wind, while the new Reserve 57/64 wheels-developed in partnership with Reserve-match the S5's asymmetric seat tube to keep airflow smooth and stable, even in crosswinds. The Ultegra Di2 12-speed groupset delivers flawless electronic shifting, and the integrated 4iiii dual-sided power meter lets us track every watt. The S5's frame is lighter and more aerodynamic than ever, with a deeper head tube and fork legs for maximum speed and stability. Every ride is a reminder that this is the bike that's shaped modern racing-now even faster, lighter, and more refined. 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 Gearheads are always here to help.