Bicycling Science by David Gordon Wilson & Theodor Schmidt

Author:David Gordon Wilson & Theodor Schmidt [Wilson, David & Schmidt, Theodor]
Language: eng
Format: epub
Tags: Bicycle history; physics; bikes; cycles; cycling; Cycling myth; Draisinne; Running machine; Recumbent bicycle; Tricycle; Power-assisted bicycle; Pedelec; human-powered; human power; Ergometer; Wingate test; Critical power; Metabolism; Oxygen; CO₂; Pedalling; Fats; Carbohydrates; Speed records; Hour record;Time trial; UCI; IHPVA; WHPVA; WRRA; Runup; Pacing; Altitude effects; Air drag; Rolling resistance; Bump resistance; Slope; Acceleration; Energy consumption; Drag coefficient; Dynamic pressure; Flow separation; Reynolds number; Aerodynamic fairing; Drafting; Crossflow; Airfoils; Sailing
Publisher: The MIT Press
Published: 2020-04-24T00:00:00+00:00

Figure 6.3

Data plots of the coefficient of rolling resistance of the same tire model (Schwalbe 20-inch Ultremo ZX) as a function of speed, with pressure and load as parameters. The bottom two solid-line plots show tire-to-tire measurements, the upper lines, tire-to-drum measurements. The bottom dashed lines show two of the curves transposed according to Schuring 1977 and ISO 28580 (2009). As an average of all measurements and calculations, this tire model, warm and at around 9 bar, has on a flat surface a static coefficient of rolling resistance of 0.002, which rises to 0.003 at slow to medium speeds and to 0.004 at high speeds. (Data from Datza 2015 and Henry 2015.)

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