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Archive for month: June, 2017

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Mechanics Ahoy

this entry has 0 Comments/ in Events and Media, Tech / by Ric Hjertberg
June 22, 2017

For current or aspiring bicycle mechanics, this is an exciting time. E-bikes, advanced materials, fun new categories, more diversity, mobile service, better tools, wow…the list keeps growing.

Check out the, just announced, technical workshops held by PBMA (our fledgling but dynamic mechanic association).

Coming later this year and next to Colorado, Portland, and Virginia. Most of the leading industry players are participating.

Learn with like-minded mechanic nerds.

There is room for just 120 mechanics at each so early registration is the only way to guarantee going. There are scholarships available, so be bold and apply!

Up your game!

Rotating Weight

this entry has 7 Comments/ in Do It Yourself, How It Works, Interesting Projects, Tech / by Ric Hjertberg
June 16, 2017

Let’s talk rotating weight. Rotating weight is a big issue for wheel builders. Why? We make choices that determine wheel weight, its total and location. Builders must understand this topic.

Rotating weight directly affects inertia, so the topic is really inertia. Inertia is the resistance of a mass to acceleration. Moment of inertia (MOI) characterizes this resistance and depends on rotating and non-rotating mass. Builders should be measuring wheel MOI.

I’ll show you how to measure moment of inertia (MOI), plus I’ll share a spreadsheet to shortcut the math supporting MOI measurement and its effect on riding. Plug in numbers and get usable wattage estimates. Read more →

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