Q&A: Zirbel frustrated by USADA treatment

Tom Zirbel decided to retire from professional cycling last week after receiving a two-year suspension from the United States Anti-Doping Agency (USADA). The time trial specialist tested positive for Dehydroepiandrosterone (DHEA) from a urine sample taken by USADA following the USPro Championships on August 29, 2009.

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Kirsten Frattini
Editor

Kirsten Frattini has been the Editor of Cyclingnews since December 2025, overseeing editorial operations and output across the brand and delivering quality, engaging content.

She manages global budgets, racing & events, production scheduling, and contributor commissions, collaborating across content sections and teams in the UK, Europe, North America, and Australia to ensure audience and subscription growth across the brand.

Kirsten has a background in Kinesiology and Health Science. She has been involved in cycling from the community and grassroots level to professional cycling's biggest races, reporting on the WorldTour, Spring Classics, Tours de France, World Championships and Olympic Games.