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  List of Major Topics
Navigation Bar Power & Speed Forces are assumed to be in equilibrium, steady-state conditions.
Power,
Given Speed
Power is calculated based on rider parameters, slope, and speed.
Speed,
Given Power
Speed is calculated based on rider parameters, slope, and power.
Tire
Rolling
Resistance
Tire Rolling Resistance. How much time can be saved by picking the right tire for a time trial?
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.
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.
Navigation Bar
Motion More often than not, forces on a rider are not in equilibrium. Under these conditions speeds change as time progresses.

Wind on Rider

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.

Rider Aero Study

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.

Speed &
Acceleration

Position, Speed, and Acceleration are calculated over time based on rider parameters, slope, power, and initial conditions. 

Downhill
Sprint

How fast will a rider go in a down-hill sprint based on rider parameters and slope. What gear? 

Wingate Test

Convert data from a Wingate ergometer sprint test to a form that can be used in subsequent calculations. 

Sprint Power

Given parameters from a Wingate test or assumed parameters, power is plotted as it changes with time, simulating sprint power. 

Terminal Velocity

Terminal velocity based on rider parameters, slope, power, and initial conditions. 

Flying 200m

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. 

500 m TT

Estimate of time for a 500 m TT based on rider parameters and Sprint Power

Kilo Power

Estimate of time for a 1000 m TT based on rider parameters and Sprint Power
Navigation Bar Pedaling Model 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.
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. 
Plot Strength
Functions
Plots strength of thighs and shins
Plot Forces
At Pedals
Plots radial and tangential forces at pedals. 
Optimal Seat
Height
Optimal seat height based on given rider parameters and thigh and shin strengths. 
Optimal Crank
Length
Optimal crank length based on given rider parameters and thigh and shin strengths. 
"Keep the
heel down"
Power output based on different geometries created by keeping the heel up or down. 
Improved Muscle
Strength
Benefits from hypothetical changes to thigh and shin strength. 
Navigation Bar Wheels 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.
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.
Calculate Wheel
Inertia
Measure rotational inertias for wheels. A weighing scale, a stopwatch, and a tape measure are all that are required.
Table of Wheel
Inertias
Table of rotational inertias and masses for typical wheels. 
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
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%.
Navigation Bar Gears 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." 
Cadence from
Speed
Estimate cadence based on chainring, cog, and speed. 
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. 


Copyright © 1997 Tom Compton All rights reserved.