Cervélo S5 Ultegra Di2 (2026)

The aero benchmark, now even faster.
The 2026 Cervélo S5 is 6 W faster and 124 g lighter than the previous generation, sharpening the sprint-dominating platform ridden at the front of the WorldTour. A deeper head tube and fork, the signature V-stem/Bayonet S5 fork, and a fully integrated HB19 one-piece carbon cockpit turn every watt into speed—while the S5’s famous stability and precise handling remain intact. Co-developed Reserve 57|64 Turbulent Aero wheels complete the system for maximum real-world aero gain.

This Ultegra Di2 build adds bulletproof 12-speed electronic shifting, 4iiii Precision Pro GEN3+ dual-sided power, and race-day rubber. Clearance for actual 34 mm tyres and a T47 BBright keep it fast, quiet and easy to live with—perfectly dialled by Elite Racing Cycles, North Perth.

Key highlights

• –6 W drag / –124 g weight vs prior S5
• Bayonet S5 fork + V-stem with fully hidden routing
• HB19 carbon bar/stem and SP34 carbon seatpost included
• Shimano Ultegra Di2 12-speed with 52/36 & 11–34 range
• Reserve 57|64 TA carbon wheels on DT Swiss 240 hubs
• 4iiii Precision Pro dual-sided power meter (factory-installed)
• Vittoria Corsa Pro TLR 29 mm tyres (tubeless-ready)
• T47 BBright threaded bottom bracket standard
• Max tyre (actual): 34 mm
• Sizes: 48 / 51 / 54 / 56 / 58 / 61 cm

Complete build spec (all included)

• Frame: Cervélo S5 carbon, fully internal routing
• Fork: Cervélo All-Carbon Bayonet S5
• Cockpit: HB19 Carbon one-piece handlebar/stem (size-matched)
• Seatpost: SP34 Carbon (0 mm setback on 48–56; 15 mm on 58/61)
• Saddle: Selle Italia Novus Boost Evo SuperFlow Ti
• Headset: FSA IS2 1-1/8″ (36×45) / 1-3/8″ (36×45)
• Bottom bracket: FSA, BBright T47 (24 mm spindle)
• Thru-axles: Cervélo Aero — front M12×1.5 (122 mm), rear M12×1.0 (169 mm)
• Wheels: Reserve 57TA front / 64TA rear, DT Swiss 240 hubs, 24H, CL, tubeless-ready
• Tyres: Vittoria Corsa Pro TLR G2.0 700×29
• Shifters/Brakes: Shimano Ultegra Di2 ST-R8170 / BR-R8170, rotors RT-CL800
• Crankset: Ultegra R8100 52/36 (crank lengths below)
• Derailleurs: Ultegra Di2 R8150 F/R
• Cassette: Ultegra R8100 12-sp 11–34
• Chain: Shimano M8100 12-sp
• Power meter: 4iiii Precision Pro GEN3+ dual-sided
• Accessories: Cervélo front computer/accessory mount 887; rear accessory mount

Cockpit & crank sizing (by frame size)

• Handlebar width: 48–36 cm / 51–38 cm / 54–40 cm / 56–40 cm / 58–40 cm / 61–40 cm
• Stem length: 48–80 mm / 51–90 mm / 54–100 mm / 56–100 mm / 58–110 mm / 61–120 mm
• Seatpost setback: 48–56 0 mm · 58–61 15 mm
• Crank length: 48–165 mm · 51–165 mm · 54–170 mm · 56–170 mm · 58–172.5 mm · 61–172.5 mm

Build, sizing or wheel upgrade questions? Pop into Elite Racing Cycles (North Perth) and we’ll get your S5 dialled.