Cervélo S3 Ultegra Di2 Disc review

Cervélo's 'baby' aero bike has less integration than the S5, but is that such a bad thing?

cervelo s3 ultegra di2 disc
Aero shaping makes the S3 a slippery customer
Cycling Weekly Verdict

If you are looking for a bike with impeccable aero credentials whilst enabling you to get to the end of a long day in the saddle without feeling battered and broken the Cervélo S3 might just be for you. Cervélo's quest to balance stiffness with comfort has yielded a machine that is ruthlessly efficient at translating your power into sustained momentum albeit with some loss in out and out performance. If you want world class sprinter levels of BB stiffness or mountain goat climbing prowess you might want to look elsewhere, but if long solo miles are your thing or you fancy yourself as a breakaway specialist then this might just be the perfect bike for you.

Reasons to buy
  • +

    Aerodynamic advantages are truly noticeable

  • +

    Improved comfort over previous version

  • +


Reasons to avoid
  • -

    Quill stem design is a little tricky to work with

  • -

    RAT axles begin to frustrate over time

You can trust Cycling Weekly. Our team of experts put in hard miles testing cycling tech and will always share honest, unbiased advice to help you choose. Find out more about how we test.

Cervélo has given its S-series bikes an overhaul, redesigning both the S5 and the S3 with a particular focus on frame stiffness and aerodynamics. The S3 is only available in two complete builds or a frame only package. We tested the top-end electronic Ultegra Di2 equipped version.

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James Bracey

James Bracey's career has seen him move from geography teacher, to MBR writer, to Cycling Weekly's senior tech writer and video presenter. He possesses an in-depth knowledge of bicycle mechanics, as well as bike fit and coaching qualifications. Bracey enjoys all manner of cycling, from road to gravel and mountain biking.