This calculator helps you estimate the 'bike rate', which is a metric used to understand the efficiency of a bicycle's gearing system. It relates the speed of the rider to the speed of the bicycle's rotation. A higher bike rate generally means the bike is traveling faster for each pedal revolution.
function calculateBikeRate() {
var cadence = parseFloat(document.getElementById("cadence").value);
var gearRatio = parseFloat(document.getElementById("gearRatio").value);
var wheelCircumference = parseFloat(document.getElementById("wheelCircumference").value);
var resultElement = document.getElementById("result");
if (isNaN(cadence) || isNaN(gearRatio) || isNaN(wheelCircumference)) {
resultElement.innerHTML = "Please enter valid numbers for all fields.";
return;
}
if (cadence < 0 || gearRatio <= 0 || wheelCircumference <= 0) {
resultElement.innerHTML = "Please enter positive values for Gear Ratio and Wheel Circumference, and a non-negative value for Cadence.";
return;
}
// Calculation: Bike Rate = Cadence (RPM) * Gear Ratio * Wheel Circumference (m/rev)
var bikeRateMetersPerMinute = cadence * gearRatio * wheelCircumference;
// Convert to km/h for a more common understanding of speed
// Meters per minute to meters per hour: * 60
// Meters per hour to kilometers per hour: / 1000
var bikeRateKmh = bikeRateMetersPerMinute * 60 / 1000;
resultElement.innerHTML = "Estimated Bike Rate (Speed): " + bikeRateKmh.toFixed(2) + " km/h";
}
.calculator-container {
font-family: sans-serif;
border: 1px solid #ddd;
padding: 20px;
border-radius: 8px;
max-width: 500px;
margin: 20px auto;
background-color: #f9f9f9;
}
.calculator-title {
text-align: center;
color: #333;
margin-bottom: 20px;
}
.calculator-inputs {
display: grid;
grid-template-columns: 1fr;
gap: 15px;
margin-bottom: 20px;
}
.input-group {
display: flex;
flex-direction: column;
}
.input-group label {
margin-bottom: 5px;
font-weight: bold;
color: #555;
}
.input-group input[type="number"] {
padding: 10px;
border: 1px solid #ccc;
border-radius: 4px;
font-size: 16px;
}
button {
display: block;
width: 100%;
padding: 12px 20px;
background-color: #4CAF50;
color: white;
border: none;
border-radius: 4px;
font-size: 18px;
cursor: pointer;
transition: background-color 0.3s ease;
}
button:hover {
background-color: #45a049;
}
.calculator-result {
margin-top: 20px;
padding: 15px;
background-color: #e7f3fe;
border: 1px solid #4CAF50;
border-radius: 4px;
text-align: center;
font-size: 18px;
color: #333;
}
.calculator-result strong {
color: #4CAF50;
}