Author Archives: zundel

What is Planing?

Jan Heine's avatarOff The Beaten Path

rando_ti

Can a 650B randonneur bike climb as well as the best titanium racing bikes? It did climb as well in a Bicycle Quarterly test, and that raised a few eyebrows. After all, the randonneur bike weighed 10 pounds more…

Theoretically, assuming equal power output on each bike, the lighter bike will be faster up the hill. So how could the heavier randonneur bike keep up?

The assumption of “equal power output” lies at the root of many misunderstandings about bicycle performance. A rider’s power output varies with many factors, like fatigue and comfort. One factor often has been overlooked: How well the bike’s frame gets in sync with the rider’s pedal strokes also affects how much power the rider can put out.

On different bikes, the same rider will have different power outputs. Optimize the bike’s flex characteristics, and your rider will be able to put out more power.

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Vision 0.08

Vision 0.08: Why any major safe-streets effort must tackle alcohol by A.J. Zelada

Consider this: If Alcohol, Inc., were a publicly traded corporation and associated with more than 10,000 deaths in 2012 (about a quarter of them among people biking and walking) why would money not be thrown that direction?

Why is there no public outrage? Why is there no greater accountability expected, as we have with GM?

Link

Smart Wheels – Dumb Wheels

I finally had figured out a real advantage to a super-light carbon-fiber bike. When it breaks and you have to carry it home, at least you’ll have less weight to carry on your shoulder.

Had a guy come in a bit ago wanting a wheel set that could get him down Mt Evans and home with a broken spoke. Got him 36° Mavics. They do learn.

With fewer spokes, spoke tension must vary less. Blade spokes tell stories: the last mechanic and the customer didn’t turn them all sorts of directions.

Spokes most often break from not enough tension, on any wheel.

My local library does not supply my reread every tens years list. (I must move.) So I have inadvertently wandered into my reread every thirty odd years list. I didn’t know I had one of those. (I doubt I will see it again, so should savor while I can.)

I blame Matthew Crawford for this — gratefully.

The radio was a clue. You can’t really think hard about what you’re doing and listen to the radio at the same time. Maybe they didn’t see their job as having anything to do with hard thought, just wrench twiddling. If you can twiddle wrenches while listening to the radio that’s more enjoyable.

Their speed was another clue. They were really slopping things around in a hurry and not looking where they slopped them. More money that way — if you don’t stop to think that it usually takes longer or comes out worse.

But the biggest clue seemed to be their expressions. They were hard to explain. Good-natured, friendly, easygoing — and uninvolved. They were like spectators. You had the feeling they had just wandered in there themselves and somebody had handed them a wrench. There was no identification wit the job. No saying, “I am a mechanic.” [….]

— Robert Pirsig, Zen and the Art of Motorcycle Maintenance

I remembering reading it, and liking it. Sometime around 1980, after I had learnt Fortran, before I learnt number theory and Gödel. Sadly I don’t remember my reaction.

I know I understand the road now. And the prairie. I don’t know if I underatnd the philosophy better yet.

Link

Economic Hunting and Gardening in Cincinnati

A group of neighbors realized that the neighborhood was beginning to deteriorate as cheap houses on their block were being bought by absentee slum lords who would then rent the properties to unsavory individuals. Drugs had become a particular problem. So they created a neighborhood organization and when the next home appeared on the market they passed a hat around and collected enough money to buy the house themselves.