S5 Dura-Ace Di2 (2026)

Faster by 6 W and 124 g lighter than its predecessor, the new S5 takes its V-stem, bayonet fork and deeper aero profiles to the next level. Developed with Reserve’s 57 | 64 Turbulent Aero wheels and Shimano’s race-winning 12-speed Dura-Ace Di2 groupset with dual-sided power meter, this build turns every watt into pure speed while preserving the precise handling and stability riders love.

Key highlights
6 W aero gain over previous S5, at least 5 W faster than rivals
New one-piece carbon V-bar / stem in nine size combos for a perfect fit
Reserve 57 mm front / 64 mm rear carbon wheels with DT Swiss 180 hubs
Shimano Dura-Ace R9270 Di2 wireless shifting, 54 / 40 T crankset, 11 – 34 T cassette
CeramicSpeed BBright bottom bracket for friction-free efficiency
Vittoria Corsa Pro TLR 700 × 29 c tyres, 34 mm max clearance
Cervélo SP34 carbon seatpost; Selle Italia Novus Boost Evo SuperFlow Carbon saddle
Integrated computer / light and rear accessory mounts; two carbon bottle cages included
Frame sizes 48 / 51 / 54 / 56 / 58 / 61 cm

Complete build specification
Frame – Cervélo S5 carbon, internal routing, 12 × 142 mm, flat-mount discs
Fork – Cervélo all-carbon Bayonet S5, 12 × 100 mm
Headset – FSA SL IS2, 1-1/8 in upper × 1-3/8 in lower
Stem – Cervélo ST31 carbon, size-matched
Handlebar – Cervélo HB19 carbon, size-matched
Seatpost – Cervélo SP34 carbon
Saddle – Selle Italia Novus Boost Evo SuperFlow Carbon
Shifters / levers – Shimano Dura-Ace R9270 Di2, 12-speed
Front derailleur – Shimano Dura-Ace R9250 Di2
Rear derailleur – Shimano Dura-Ace R9250 Di2
Crankset – Shimano Dura-Ace R9200, 54 / 40 T, 4iiii Precision Pro GEN3+ dual-sided power meter
Cassette – Shimano Dura-Ace R9200, 11-34 T, 12-speed
Chain – Shimano M9100, 12-speed
Bottom bracket – CeramicSpeed SL, BBright for 24 mm spindle
Brakes / rotors – Shimano Dura-Ace hydraulic, CL900 CenterLock
Wheels – Reserve 57 TA front and 64 TA rear, DT Swiss 180 hubs, tubeless-ready
Tyres – Vittoria Corsa Pro TLR G2.0, 700 × 29 c
Max actual tyre width – 34 mm
Thru-axles – Cervélo Aero 12 × 122 mm front, 12 × 169 mm rear
Accessories – computer / accessory mount, rear accessory mount, Smartpak 400A top-tube bag, in-frame storage rolls, two Arundel Mandible matte-UD carbon cages