Lennard Zinn 

@lennardzinn
Since 1982, LENNARD ZINN’s built custom bikes: zinncycles.com. He is author of Zinn & the Art of Mountain Bike Maintenance, Zinn & the Art of Road Bike Maintenance, The Haywire Heart, and countless VeloNews tech articles.
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Technical Q&A with Lennard Zinn
By Lennard Zinn
I bring my 40+ years of experience building bike frames and forks, riding bikes, and writing about bicycle technology and maintenance to answering your questions.