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Description

The Cervélo S5 Ultegra Di2 Bicycle (Model Year 2025) is an aerodynamic powerhouse, meticulously refined to push speed and performance to new heights. By deepening frame sections and maximizing UCI-allowed shapes, Cervélo has reduced drag by 65 grams while increasing the surface area and shaving overall weight. The iconic V-stem has been further refined for improved aerodynamics and adjustability, and a newly designed fork simplifies the front-end structure. A collaboration with Reserve has led to a cutting-edge wheel design that enhances stability and reduces drag in turbulent aero conditions. Optimized for wider wheels and tires, the S5 comes equipped with 28mm tires but has clearance for up to 34mm, complementing the Reserve 52/63 wheelset and delivering an additional 5-watt energy savings over previous models. The latest UCI aerodynamic regulations allowed for a deeper head tube, a more aggressively shaped bottom bracket area, and refined trailing edges, ensuring this remains one of the fastest aero bikes on the market.

The S5 is engineered for precision and adaptability, making it easier than ever for riders to dial in their perfect fit. The V-stem's simplified design now includes one bolt length and all necessary spacers, reducing complexity and weight by 53g. The handlebars have been redesigned for enhanced comfort, featuring a two-bolt interface that allows infinite tilt adjustments between 0 and 5 degrees, ensuring a smooth bar-to-hood transition. The seat post has also been revised, with most sizes now featuring a 15mm offset rather than the previous 25mm, reflecting the evolving preferences of professional bike fitters. For those seeking a more extreme fit, the outgoing 400mm-long, 25mm offset post remains available. The S5 is exclusively compatible with electronic shifting, accommodating connectors up to 6mm in diameter but not supporting mechanical shifting or Campagnolo EPS systems.

Equipped with top-tier components, the S5 Ultegra Di2 features a Cervélo All-Carbon Bayonet S5 Fork, Cervélo ST35 Carbon Stem, and Cervélo HB14 Carbon Handlebar for superior handling and aerodynamics. The Shimano Ultegra 12-speed drivetrain ensures crisp and efficient shifting, paired with a Shimano Ultegra 52/36T crankset and a 4iiii Precision Pro GEN3+ dual-sided power meter for performance tracking. Braking is handled by Shimano Ultegra calipers and CL800 Centerlock rotors for confident stopping power. The bike rolls on Reserve 52/63 tubeless-compatible wheels, featuring a Zipp ZR1 ST hub system for durability and speed. Accessories include a Cervélo faceplate front computer mount and a rear accessory mount, ensuring the bike is race-ready with all the essentials. Available in sizes 48 through 61, the S5 Ultegra Di2 is designed for riders who demand uncompromising speed, adjustability, and cutting-edge aerodynamics.

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Features

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  • Redesigned aerodynamic frame with 65 grams of drag reduction, increased surface area, and reduced overall weight
  • Cervélo All-Carbon Bayonet S5 Fork, Cervélo ST35 Carbon Stem, and HB14 Carbon Handlebar for superior handling and aerodynamics
  • Co-developed with Reserve, featuring Reserve 52/63 tubeless-compatible wheels with Zipp ZR1 ST hubs for stability and reduced drag
  • Optimized for wider tires, equipped with 28mm tires but capable of fitting up to 34mm for improved aerodynamics and comfort
  • Shimano Ultegra 12-speed drivetrain with R8170 shifters, R8150 derailleurs, and an 11-34T cassette for smooth and precise shifting
  • Braking system includes Shimano Ultegra calipers and CL800 Centerlock rotors for confident stopping power
  • 4iiii Precision Pro GEN3+ Dual-Sided Power Meter integrated with Shimano Ultegra R8100 52/36T crankset for performance tracking
  • Selle Italia NOVUS BOOST EVO SuperFlow Ti saddle and Cervélo SP20 Carbon seatpost for enhanced comfort and adjustability
  • Includes Cervélo Faceplate Front Computer/Accessory Mount and Rear Accessory Mount for added functionality
  • Available in six sizes: 48, 51, 54, 56, 58, and 61 to accommodate a range of riders
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    Geometry
    Size 48cm 51cm 54cm 56cm 58cm
    Wheel Size 700 700 700 700 700
    Stack 496mm 519mm 542mm 565mm 588mm
    Reach 367mm 376mm 384mm 392mm 401mm
    Head Angle 71° 72° 73° 73.5° 73.5°
    Seat Angle 73° 73° 73° 73° 73°
    Top Tube Length 520mm 535mm 550mm 565mm 581mm
    Head Tube Length 69mm 87mm 109mm 130mm 157mm
    Standover 707.5mm 729.2mm 747.4mm 775.3mm 805.9mm
    Fork Trail 57.1mm 57mm 57.1mm 57mm 57mm
    Fork Offset 58mm 52mm 46mm 43mm 43mm
    Bottom Bracket Drop 72.5mm 72.5mm 70mm 70mm 67.5mm
    Front Center 579mm 580mm 581mm 588mm 604mm
    Wheelbase 973mm 974mm 975mm 982mm 999mm
    Chainstay Length 405mm 405mm 405mm 405mm 405mm
    Applies to all S5 disc brake models since 2019, including 2023 release.
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