public void Test()
{
var wheel = new Wheel("700x23", "", 333);
var crank = new Crank(175);
var chainrings = new Chainrings(new[] {50, 39, 30});
var cassette = new Cassette("Shimano Tiagra Cassette 9 Speed HG50", new[] {12, 13, 14, 15, 17, 19, 21, 23, 25});
CalcGears(wheel, crank, chainrings, cassette);
}
public void CalcGears(Wheel wheel, Crank crank, Chainrings chainrings, Cassette cassette)
{
var wheelSize = wheel.Radius * 2 / 25.4; // to diameter inch
var radiusRatio = wheel.Radius / crank.Length;
var numRings = chainrings.Sprockets.Length;
var numCogs = cassette.Sprockets.Length;
var rings = chainrings.Sprockets;
var cogs = cassette.Sprockets;
var gear = new double[numRings,numCogs];
var value = new double[numRings,numCogs];
var ring = new int[numRings,numCogs];
var ratio = new double[numRings,numCogs];
var rollout = new double[numRings,numCogs];
var speed = new double[numRings,numCogs];
var lspeed = new double[numRings,numCogs];
var hspeed = new double[numRings,numCogs];
const int RPM = 90;
for(var j = 0; j<numRings; j++)
{
for(var i = 0; i<numCogs; i++)
{
gear[j, i] = (rings[j] / cogs[i]) * numCogs - i;
// inchgears
value[j, i] = wheelSize * rings[j] / cogs[i];
Console.WriteLine("{0} x {1} = {2}", rings[j], cogs[i], value[j, i].ToString("0.0"));
ring[j, i] = rings[j];
// Sheldon's ratios
ratio[j, i] = radiusRatio * rings[j] / cogs[i];
Console.WriteLine("{0} x {1} = {2}", rings[j], cogs[i], ratio[j, i].ToString("0.00"));
// rollout
rollout[j, i] = value[j, i] * Math.PI;
Console.WriteLine("{0} x {1} = {2}", rings[j], cogs[i], rollout[j, i].ToString("0.00"));
// speed
speed[j, i] = (((rollout[j, i] * RPM) * 60) / 12) / 5280;
//lspeed[j, i] = (((rollout[j, i] * lRPM) * 60) / 12) / 5280;
//hspeed[j, i] = (((rollout[j, i] * hRPM) * 60) / 12) / 5280;
Console.WriteLine();
}
}
Console.WriteLine("Speed ranges");
for(var i = 0; i<numRings; i++)
{
var max = double.MinValue;
var min = double.MaxValue;
for(var j = 0; j<numCogs; j++)
{
var s = speed[i, j];
min = Math.Min(s, min);
max = Math.Max(s, max);
}
Console.WriteLine("{0}: {1} - {2}", rings[i], min, max);
}
}
