orthotics

Technical Q&A with Lennard Zinn – The demands of ceramics

Are ceramics that delicate?
Dear Lennard,
In your article on ceramic bearings in the recent VeloNews Buyers Guide I got the impression that these things were not only smooth but durable as well. As a result, I ordered a ceramic SRAM bottom bracket with the Red crankset on my new bike. To say the least, I was surprised when I read the SRAM maintenance instructions that came with it and saw the recommendation that one should disassemble and lube the bearings after every 100 hours of use and immediately after riding in the rain or wet.

Tech Report with Lennard Zinn: The science behind the sport

Tuesdays at VeloNews.com usually feature Lennard Zinn's "Technical Q&A"column, in which VeloNews' senior technical writer fields questionsfrom you, our readers. But this week, Boulder, Colorado, is playing hostto the first (and hopefully annual) CyclingScience Symposium and Expo, organized by the Serotta InternationalCycling Institute. Yup, it's a sort of bike geek Woodstock (albeit on a much smaller scale) and we knewexactly where we'd find our friend Lennard. For the next few daysZinn will be attending the seminar and, when he gets some time, even sendingus a few reports

Technical Q&A with Lennard Zinn – Chains and cogs, triples and doubles, mixing wheel components and hotfoot feedback

Dear Lennard,I just installed a new Wippermann 10-spd chain on an otherwise Campy Record group. All the components are one year old. I'm trying to eliminate an annoying "tinging" that I'm getting when climbing hard out of the saddle or sprinting. No success with the "tinging" but I introduced a new problem ... the new chain jumps and skips and won't stay engaged in the larger cogs. Have I worn out the rear cogs? I'm now thinking that the "tinging" noise may be coming from the engagement of the chain with the chainrings (30-42-52 ); the old Campy chain engages the rear cogset okay, but perhaps