HeyJaredTechnical Q&A with 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. I have no advertising nor an ad sales staff asking me to go easy on advertisers.
- Indexed issues, last 90 days
- 12
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- Sep 29, 2026
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- Jul 13, 2026
Latest issues
Chain waxing and adjusting a 12-speed Di2 front derailleur (opens the original)
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Dear Lennard,Probably a typo, but on step 7 on your August 24th post, that should be the inner plate that you get within 0.5mm of the chain, not the outer.DannyDear Danny,Thanks so much for catching that! I fixed it just now. Indeed, when adjusting the front derailleur with the chain in big-to-big, it is the inboard side of the chain that you are interested in ensuring clears the front derailleur’s inner cage plate.― LennardDear Lennard,I forgot to write in earlier on the myths o
Grand Canyon Flash Floods (opens the original)
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Dear Readers,Knowing I was rafting the Grand Canyon, some of you wrote me with well wishes after hearing about the devastating flood that came down Bright Angel Creek on August 29, killing three hikers, wiping out much of Phantom Ranch, and temporarily closing the entire Grand Canyon. Thanks for your concern; I’ll fill you in a bit on that.At the t
Tomorrow We Must Come Out of the Grand Canyon (opens the original)
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Dear Readers,Today I am 15 days into my current trip down the Colorado River through the Grand Canyon. As trips during the main season are limited by the Park Service to 16 days, we are required to take out tomorrow (it used to be 18 days until the rule was changed in 2007). My beard will be stubbly, and I’ll be ready for a shave and shower (and for my 50th high school reunion this weekend in New Mexico). Nonetheless, it is always hard to leave the peace and tranquility, and occasional excitemen
Hi Again from the Depths of the Granite Gorge in the Grand Canyon (opens the original)
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Dear Readers,Today I am eight days into my trip down the Colorado River through the Grand Canyon.I expect that today we will run Crystal Rapid at river mile 98. Crystal, which formed in 1966 when Crystal Creek flooded. It features a huge hole in the center that has flipped many a raft, and plenty of others have come to grief against the right wall or onto the boulders in the middle of Lower Crystal. It is perhaps the second most feared rapid in the Grand Canyon
Greetings from the Bottom of the Grand Canyon (opens the original)
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Dear Readers,I don’t think I have missed a single Monday other than maybe Christmas and New Years since I started this Substack. I don’t intend to stop now, even though I scheduled this post before I left Boulder, and even though it won’t be about bikes or athletes’ hearts. It does have some tech, though, about water; this is a tech column, after all.Today I just put in at Lee’s Ferry for 16 days on the Colorado River through the Grand Canyon. This is my 9th time running the Grand Canyon since 2
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