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Indeed your average speed is total distance over total time Regarding sampling this is where you go wrong: "If you compute the average over distance instead (i.e., your speed every tenth of a mile), the uphill and downhill are equally weighted." No they are not equally weighted. The denominator is time (not distance). You need to take even samples in ...


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The accepted answer states drag does not scale with mass. Which is true. But drag does scale with frontal area. It is fair to assume the two frames are made of the same material therefore the larger frame has a larger frontal area. Rather than compare balloon and soccer ball of the same size a more appropriate comparison is two rocks of the same density ...


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It's not about energy to accelerate the bike to speed, but the energy to keep it there. For bicycles the kinetic energy is a small part of the total power output of the rider (typically under 10m/s = 36km/hour and 100kg, and e=1/2 m v² = .5 * 100 * 10² = 5000J or watt-seconds. So a casual rider putting out 250W could reach 36kph in 20 seconds, assuming no ...


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Start with optimal pressure versus weight. The minimum and maximum pressure are on the sidewall - never exceed that range. Each tire manufacture will typically provide guidelines for where in the that range based on weight and conditions. This is a chart from Michelin. In this chart looking at 700X25c going from about 174 to 128 for a difference of 46 ...



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