By Jobst Brandt
Jobst Brandt is an engineer who has been a specialist to the bicycle for a few years, having been thinking about the production of Avocet's line of highway tires, between different items. those that have corresponded with him or learn his posts on rec.bicycling recognize him as an opinionated, probably gruff fellow who doesn't undergo fools evenly. particularly a reputation.
But what Jobst is maybe top recognized for is that this booklet, The Bicycle Wheel. In it, he demolishes myths, and offers real engineering information to aid his contentions approximately bicycle wheels fabrics and development. He tells you why butted spokes are higher and longer lasting than directly gauge spokes, and why tying and soldering spokes doesn't make a wheel any better (and why it was once still an invaluable factor for song racers to do). He explains why radial spoking doesn't fairly make for a rougher experience, as a few declare, and he supplies genuine figures on elongation and pressure to again up his claims And he teaches you ways to construct sturdy bicycle wheels, too.
This is a ebook for any critical bicycle rider. for those who decide to construct your individual wheels, Brandt will educate you to that. if you purchase your wheels, Brandt will train you to spec and hold them. And if you're easily drawn to greater figuring out the functionality and physics of bicycle wheels, he'll educate you that in addition. no longer a nasty deal for one small quantity.
Read or Download The Bicycle Wheel (3rd Edition) PDF
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Extra info for The Bicycle Wheel (3rd Edition)
Heat from rubbing is generated by stretching and breaking intermolecular bonds. The softer material generates more heat because it deforms more under the rubbing action. Because friction materials used for brake pads are insulators, brake pads remain cool to the touch during braking except on their contact surfaces where momentum of rider and bicycle is converted to heat by friction. This means that heat generated in the brake pad must be transferred to the rim where it can be absorbed and dissipated.
This design has not become popular for bicycles because it allows only one spoke pattern and the hub is large and heavy. Also in this design, the head of the spoke is its weakest part because the grain structure of the material there is disrupted and weakened. Failure of this kind of spoke occurs mostly at the head, whereas the heads of spokes with elbows are stressed significantly less. FLAT AND OVAL SPOKES Flattened spokes are made to reduce wind drag, but their resistance to twist is so poor that they are difficult to tighten properly without giving them a corkscrew twist.
The load that will cause collapse is roughly equal to the sum of the tension in four or five spokes. Therefore, the tighter its spokes are (up to a point), the greater a wheel's load capacity. Wheels have both radial and lateral strength. Although both improve with increasing spoke tension, lateral strength is mostly dependent on how far apart the hub flanges are spaced. If the spokes are sufficiently tight that they do not become slack from vertical loads, then both lateral and torsional loads are no concern because they are relatively small and usually do not occur in conjunction with extreme vertical loads.
The Bicycle Wheel (3rd Edition) by Jobst Brandt