Cervelo P Ultegra Di2 Size 56 Deep Dhalia

The Cervélo P-Series Ultegra Di2 in Deep Dahlia is a high-performance time trial (TT) and triathlon bike engineered for speed, precision, and efficiency. Drawing directly from the DNA of Cervélo's flagship P5—proven in WorldTour racing, including Team Jumbo-Visma's 2023 Giro d'Italia and Tour de France victories—this model distills elite-level aerodynamics and wind-tunnel optimization into a package accessible to dedicated triathletes and TT specialists. Sized at 56cm (ideal for riders approximately 5'10" to 6'1" or 178–185cm tall, depending on fit preferences), it features a striking Deep Dahlia colorway—a rich, metallic purple-red hue that evokes the vibrancy of blooming dahlias while maintaining a sleek, race-ready aesthetic. Whether conquering Ironman distances or shaving seconds in a crit-stage TT, this bike is built to propel you from T1 to T2 (or A to B) with unmatched velocity.

Frame and Construction

At the heart of the P-Series is Cervélo's all-carbon frame, meticulously shaped through decades of aerodynamic R&D. The frame employs advanced carbon layup for a featherlight yet rigid structure, weighing approximately 1,050g (frame only, size 56). Key innovations include:

• Wind-tunnel-optimized tubing: Deep-section profiles and Kamm-tail shapes minimize drag, with the frame tested to save up to 6–8 watts at 45km/h compared to previous generations.
• Integrated cable routing: Fully internal lines for the electronic Di2 shifting and hydraulic brakes create a clean, drag-free silhouette.
• Enhanced clearance: Accommodates up to 34mm tires (with 29mm stock), allowing for wider, more compliant rubber without sacrificing aero gains.
• First-in-class internal storage: A hidden compartment beneath the downtube bottle cage securely holds a spare tube, multi-tool, and CO2 cartridges—accessible via a quick-release hatch, even with a bottle mounted. This keeps essentials aero and out of sight, perfect for self-supported triathlons.

The matching all-carbon fork features a tapered steerer (1-1/8" to 1-3/8") for precise handling and front-end stiffness, paired with Cervélo's Aero Thru-Axles (12x100mm front, 12x142mm rear) for tool-free wheel changes and optimal power transfer.

Components and Groupset

Equipped with Shimano's Ultegra Di2 12-speed electronic drivetrain, this build delivers lightning-fast, wireless shifting with customizable ergonomics via the E-Tube app. Highlights include:

• Crankset: Shimano Ultegra R8100, 52/36T chainrings with 4iiii Precision 3+ dual-sided power meter for real-time cadence and wattage data—essential for pacing long efforts.
• Cassette and Chain: 11-30T 12-speed cassette paired with an M8100 chain for a wide gear range suited to rolling tri courses or punchy TT climbs.
• Derailleurs: Ultegra R8150 front and rear, with synchronized shifting for seamless transitions under load.
• Brakes: Ultegra hydraulic disc calipers (RT-MT800 rotors) provide confident stopping power in wet or high-speed descents.

The cockpit is highly adjustable for a dialed-in aero position:

• Handlebar: Cervélo P5 Carbon Basebar with EX14 Carbon Extensions—fully adjustable for J-bend or straight extensions, supporting a wide range of rider anatomies.
• Stem: Integrated alloy for stiffness and low weight.
• Saddle: Prologo Dimension TiRox, a short-nose design that reduces pressure on long rides while maintaining stability in the drops.

Wheels and Tires

Rolling on premium Reserve carbon wheels, the setup prioritizes low drag and tubeless compatibility:

• Front Wheel: Reserve 52 (25.4mm internal width, 24h, ZR1 hubs, centerlock).
• Rear Wheel: Reserve 63 (24.4mm internal width, 24h, HG freehub, centerlock). These hookless rims spin up quickly yet maintain composure at speeds over 50km/h, shod with Vittoria Corsa Pro Speed TLR 700x29c tires for supple grip and rolling efficiency. The deep 52/63mm profiles are optimized for crosswinds, ensuring stability without excess weight (wheelset ~1,650g).

Geometry and Fit (Size 56)

The P-Series geometry is aggressively aero-focused, with a longer reach and lower stack to promote a powerful, wind-cheating position:

• Stack: 505mm
• Reach: 390mm
• Top Tube: 560mm
• Head Tube Angle: 72.5°
• Seat Tube Angle: 77°
• Chainstay Length: 410mm
• BB Drop: 70mm
• Wheelbase: 990mm

This setup favors riders seeking maximum power output in the TT tuck, but the adjustable cockpit allows fine-tuning for comfort over ultra-endurance events. Cervélo recommends a professional bike fit for optimal setup, as the 56cm frame supports inseams up to 84cm.

Performance Highlights

• Aerodynamics: Saves ~12 watts over UCI-legal TT limits, per Cervélo's CFD modeling—translating to 1–2 minutes gained over a 40km TT.
• Weight: Complete bike ~8.2kg (without pedals), balancing lightness with durability for rough roads or gravel-touched tris.
• Versatility: Dual-purpose for pure TTs or full Ironman builds; mounts for hydration systems and bento boxes enhance long-haul capability.
• Warranty: Lifetime frame warranty for original owner, with 2 years on components.