Season 1 Episode 42:

In this episode, John has a wide-ranging discussion about bikes, heart health, and the joy of getting outside with Lennard, a former elite-level bike racer and current journalist, author, custom bike builder, and passionate outdoor activity enthusiast.

Show Notes:

Lennard Zinn of Boulder, CO is probably best known for his frequent technical journalistic contributions on VeloNews and his incredibly popular books published by VeloPress on bike maintenance and repair, Zinn and the Art of Mountain Bike Maintenance and Zinn and the Art of Road Bike Maintenance.

He’s also a co-author, along with Chris Case and Dr. John Mandrola, of The Haywire Heart: How too much exercise can kill you, and what you can do to protect your heart and he has become the go-to builder of custom titanium bikes for big & tall riders with his company Zinn Cycles and has stock steel bikes through a partnership with KHS

Our conversation kicks off with a description of how he made the transition from an elite-level racer to a bike builder, then journalist and author, and finally, we dive into the emerging details of “athlete’s heart syndrome” or “haywire heart”.

Additional Helpful Links:

APS Physics Interview from 2017

Tom RitcheyRitchey Bikes

Cycling to Extremes Article – VeloNews

Davis PhinneyDavis Phinney Foundation helping people with Parkinson’s

Connie Carpenter-PhinneyUSA Cycling Hall of Fame

Dave Scott, Six-Time Ironman Triathlon World ChampionDave’s Page

Peter Sagan

Egan Bernal

Dr. Shannon Sovndal ~ Garmin Sharp Pro Cycling Team

Heart Arrhythmia, Tachycardia, Fibrillation

Patellofemoral Pain Syndrome

Boulder B-Cycle ~ B-Cycle e-Assist Bike

Austin B-Cycle ~ CapMetro & City Partnership

A Recent Article on e-bikes

Bosch e-Bike Systems

Zinn Fondo article

New Custom Zinn e-Bike w/ 32 inch Wheels

Strava KOM or QOM defined, tips

Bike Power Meter

Titaniumtensile strength elongation properties

Cross Country Skiing Techniques – Skate & Classic and Backcountry



Audio Production by Active Towns

A not-for-profit organization dedicated to helping communities create a Culture of Activity.

Creative Commons License: Attributions Non-Commercial No Derivatives 2020

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You can reach John Simmerman at

Music: Rose Colored Glasses by Lance Conrad, Uplifting Acoustic Loop by Joel Thomas Hunger, and Heartland and Home by Will Van De Crommert via