Lennard Zinn is the world’s leading expert on bike maintenance and repair. He is a world-renowned bicycle technician, author, and frame builder, and his Technical FAQ column has helped riders all over the world for years. Lennard was a member of the U.S. national racing team and has been riding and fixing bikes for nearly 50 years. His best-selling bike maintenance and repair books include Zinn & the Art of Road Bike Maintenance, Zinn & the Art of Triathlon Bikes, Zinn’s Cycling Primer, The Mountain Bike Performance Handbook, and The Mountain Bike Owner’s Manual. Got a tech question? Email Lennard at email@example.com.