Expert Endorsements

Lennard Zinn
Bicycle designer, founder and president, Zinn Cycles Inc.

Author of “Zinn and the Art of Road Bike Maintenance”, “Zinn and the Art of Mountain Bike Maintenance”, The Haywire Heart”, and other books.

Senior Technical Writer for VeloNews.com & VeloNews magazine 
www.zinncycles.com. 

David Gordon Wilson
Professor of Mechanical Engineering Emeritus
Massachusetts Institute of Technology
Author of “Bicycling Science”

William Mullin
Emeritus Professor of Physics
University of Massachusetts Amherst
Author of “Quantum Weirdness”