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Forces are assumed to be in equilibrium, steady-state conditions. |
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Power, Given Speed |
Power is calculated based on rider parameters, slope, and speed. | |
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Speed, Given Power |
Speed is calculated based on rider parameters, slope, and power. | |
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Tire Rolling Resistance |
Tire Rolling Resistance.
How much time can be saved by picking the right tire for a time trial? |
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Forces on Rider |
Forces on a rider due to slope, rolling resistance, air drag, and wheel drag. Forces are given in grams-force and by percent. | |
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Less Weight on Hill |
Two riders ride up a hill. One has less weight. What is the difference between them in distance and time? | |
| Air Density | Air Density is calculated based on links to weather information. Power requirements depend on Air Density. | |
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Here are some tools to let you get more from your Power Measurement data. | |
| Upload your data. Select a range for plotting. Show the data as a function of time or distance. | Plot histograms and statistics for power, cadence, speed, heart rate, torque, and acceleration. | |
| Plot various combinations of power, heart rate, cadence, speed, and torque. | ||
| Plot accelerations. | ||
| Select data for study based on effort, cadence, torque, heart rate, or speed. | ||
| What gear were you in during an effort? What gears did you use on your ride? | ||
| Example of using Power Data for designing a workout. | ||
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More often than not, forces on a rider are not in equilibrium. Under these conditions speeds change as time progresses. | |
| Wind's effect on rider over a caurse of your choice. You set wind speed and direction. You set your wheel drag parameters as function of wind yaw angle. | John Cobb, who does wind tunnel testing for some of the best riders in the world, sent us some of his wind tunnel data. We did an analysis and report the results. | |
| Position, Speed, and Acceleration are calculated over time based on rider parameters, slope, power, and initial conditions. | ||
| How fast will a rider go in a down-hill sprint based on rider parameters and slope. What gear? | ||
| Convert data from a Wingate ergometer sprint test to a form that can be used in subsequent calculations. | ||
| Given parameters from a Wingate test or assumed parameters, power is plotted as it changes with time, simulating sprint power. | ||
| Terminal velocity based on rider parameters, slope, power, and initial conditions. | ||
| Estimate of time for a flying 200m based on rider parameters, wheel parameters, configuration of 333.3m velodrome, Sprint Power , and path ridden by rider. | ||
| Estimate of time for a 500 m TT based on rider parameters and Sprint Power. | ||
| Estimate of time for a 1000 m TT based on rider parameters and Sprint Power. | ||
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A model of pedaling a bike is presented. The Model lets one make assumptions regarding strength of the thigh and shin muscle groups and converts these assumptions into power at the pedals. |
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Pedaling Model Concept |
Explanation of Pedaling Model. | |
| Pedaling Model | Ranges of motion, plots of position, and power generated are given based on rider geometry and thigh and shin strength. | |
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Plot Strength Functions |
Plots strength of thighs and shins. | |
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Plot Forces At Pedals |
Plots radial and tangential forces at pedals. | |
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Optimal Seat Height |
Optimal seat height based on given rider parameters and thigh and shin strengths. | |
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Optimal Crank Length |
Optimal crank length based on given rider parameters and thigh and shin strengths. | |
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"Keep the heel down" |
Power output based on different geometries created by keeping the heel up or down. | |
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Improved Muscle Strength |
Benefits from hypothetical changes to thigh and shin strength. | |
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Wheel performance in various situations is evaluated based on measurements you can take on your own wheels. Enter data on tire mishaps and analyze it. |
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Wheel
Aerodynamics and Inertia Concepts |
Concept of how to measure wheel rotational inertia is presented as well as a explanation of the equations used for evaluation. Wheel aerodynamics is discussed. | |
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Calculate
Wheel Inertia |
Measure rotational inertias for wheels. A weighing scale, a stopwatch, and a tape measure are all that are required. | |
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Table of Wheel Inertias |
Table of rotational inertias and masses for typical wheels. | |
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Table of Drag Coefficients |
Table of aerodynamic drag coefficients for various wheels. | |
| Criterium Corner | Criterium corner: based on your parameters which wheels give the better performance. | |
| Breakaway | Breakaway: based on your parameters which wheels give the better performance. | |
| Sprint | Sprint: based on your parameters which wheels give the better performance. | |
| Climb | Climb: based on your parameters which wheels give the better performance. | |
| Pursuit | Pursuit: based on your parameters which wheels give the better performance. | |
| Mishaps | Enter data on tire mishaps. | |
| Analysis | Analyze tire mishap data. | |
 Example |
An example shows how the tools presented here could be used. In the example a hypothetical rider uses the tools to reduce a time trial time by 20%. | |
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Gear charts show "gear inches" and "rollout" for various gear combinations and wheel diameters. |
| Gear Chart | Gear charts based wheel diameter, "gear inches," and "rollout." | |
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Cadence from Speed |
Estimate cadence based on chainring, cog, and speed. | |
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Speed from Cadence |
Estimate speed from chainring, cog, and cadence. | |
| Gear Selection | Track gear selection based on wheel diameter, air density, rider parameters, expected speed. | |
| Track | Shows the effect of rider parameters, air density, and wheel diameter on gear selection for points race. | |
| Pursuit | Shows the effect of rider parameters, air density, and wheel diameter on pursuit times. | |
| Long Climb | Gear selection for a long climb. | |
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