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What is CdA in cycling? How to reduce drag so you can ride faster for less effort

Triathlete or time trial cyclist, you might have come across the term ‘CdA’ in discussions about optimising aerodynamics on the bike. But what is CdA and why does it matter? We speak to the aero experts at Body Rocket to find out.

By Jenny Lucas-Hill

Content Director

Last updated -

16 Jul 2025

Whether you’re into triathlons or time trialling – or a bit of both depending on what time of the year it is. You’ll know that optimising your aerodynamics on the bike can be a game changer when it co...

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Written by

Jenny Lucas-Hill

Jenny Lucas-Hill is Content Director at TRI247. A five-time Ironman finisher, she's also a qualified personal trainer and sports massage therapist.

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What is CdA in cycling? How to reduce drag so you can ride faster for less effort

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