The Bicycle Wheel 3rd Edition Hardcover Author: Jobst Brandt | Language: English | ISBN:
0960723668 | Format: PDF, EPUB
The Bicycle Wheel 3rd Edition Free PDF
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- Hardcover: 150 pages
- Publisher: Avocet; 3rd edition (1993)
- Language: English
- ISBN-10: 0960723668
- ISBN-13: 978-0960723669
- Product Dimensions: 0.5 x 7 x 5 inches
- Shipping Weight: 1 pounds (View shipping rates and policies)
Unlike some reviewers who would like to see Brandt describe and bless novel spoking patterns, I concur with his recommendation of traditional spoking. The traditional tangent tension-spoked wheel is one of the most elegant and efficient structures ever devised. A wheelbuilder may choose a rim, hub and spokes at will and so, construct wheels of many kinds that are not available commercially. With skill and care, an amateur may build wheels of professional quality. The traditional wheel may be built to the desired degree of ruggedness vs. weight, and if damaged, can often be made usable with an emergency repair or adjustment.
Brandt's advice faces challenges from within the bicycle industry, which is always looking for a new selling point. Wheels with low spoke counts, trendy now (2006) are more tolerable with deep-section aero rims than with shallow rims and can make sense for racers, who are willing to sacrifice reliability for a very slight increase in performance -- but for most bicyclists, it is much more important not to get stranded or crash than to increase speed by half a percent.
Some of the newer types of wheels may sell because they look different, but provide little actual advantage. Wheels with thick aluminum or polycarbonate spokes decrease weight slightly but at a major expense in air drag. Carbon-fiber spokes have a very poor record of reliability and safety, though carbon-fiber-epoxy composite material has been used successfully in rims and in single-piece formed wheels. Still, brake shoes wear carbon-fiber-epoxy quickly, so a metal braking surface is preferable. Don't get me talking about paired spokes, which make a wheel look as if it has fewer spokes -- but require a heavier rim, because longer rim segments are unsupported.
This book, while it does indeed tell you how to lace and tension a bicycle wheel (although missing several key points about hub positioning and spoke alignment), misleads on its purported mission of illuminating the engineering aspects of wheel construction. It misleads because there are a number of technical errors which can misdirect those who may be starting out in engineering and misinform their learning, and it misleads wheel builders with practice recommendations that are technically flawed and which can actually have a serious negative impact on a wheel's performance/durability.
More obvious examples:
1, Page 30: This stress/strain plot is for plain steel, not the stainless steel wire from which most hand-building spokes are actually made. Although the stress/strain plot for stainless is correctly shown on p125, the plain steel plot is different in several important technical ways and these plain steel distinctions are (mis)used to draw incorrect conclusions about strain aging and fatigue behavior that isn't present in stainless steel spoke wire.
2. Page 35: Wheels do not collapse if spokes go loose because rim materials have both tensile and compressive strength. They become less stiff, but collapse is a function of rim strength, not spoke tension (see #10). And pre-load is misunderstood. The higher the pre-load, the lower the capacity for applied load in materials with both tensile and compressive strength. Misunderstanding this fundamental point has serious negative implications throughout this book.
3. Page 46: To refer to all slimmed spokes as "swaged" is incorrect. Swaging is a specific hammering process. Other means of slimming spokes include both die drawing and circumferential grinding.
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