.tire-size-comparison-calculator-container {
font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
max-width: 800px;
margin: 20px auto;
padding: 25px;
background: #f9f9f9;
border-radius: 10px;
box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
color: #333;
}
.tire-size-comparison-calculator-container h2 {
text-align: center;
color: #2c3e50;
margin-bottom: 25px;
font-size: 2em;
}
.tire-size-comparison-calculator-container .input-group {
display: flex;
flex-wrap: wrap;
gap: 20px;
margin-bottom: 20px;
justify-content: space-around;
}
.tire-size-comparison-calculator-container .input-section {
flex: 1;
min-width: 300px;
background: #ffffff;
padding: 20px;
border-radius: 8px;
box-shadow: 0 2px 5px rgba(0, 0, 0, 0.05);
}
.tire-size-comparison-calculator-container .input-section h3 {
text-align: center;
color: #34495e;
margin-bottom: 15px;
font-size: 1.4em;
}
.tire-size-comparison-calculator-container label {
display: block;
margin-bottom: 8px;
font-weight: bold;
color: #555;
font-size: 0.95em;
}
.tire-size-comparison-calculator-container input[type="number"] {
width: calc(100% – 20px);
padding: 10px;
margin-bottom: 15px;
border: 1px solid #ccc;
border-radius: 5px;
font-size: 1em;
box-sizing: border-box;
}
.tire-size-comparison-calculator-container button {
display: block;
width: 100%;
padding: 12px 20px;
background-color: #3498db;
color: white;
border: none;
border-radius: 5px;
font-size: 1.1em;
cursor: pointer;
transition: background-color 0.3s ease;
margin-top: 20px;
}
.tire-size-comparison-calculator-container button:hover {
background-color: #2980b9;
}
.tire-size-comparison-calculator-container .results-section {
margin-top: 30px;
padding: 25px;
background: #eaf4f9;
border-radius: 8px;
border: 1px solid #cce7f4;
box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}
.tire-size-comparison-calculator-container .results-section h3 {
color: #2c3e50;
text-align: center;
margin-bottom: 20px;
font-size: 1.6em;
}
.tire-size-comparison-calculator-container .results-grid {
display: grid;
grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
gap: 15px;
}
.tire-size-comparison-calculator-container .result-item {
background: #ffffff;
padding: 15px;
border-radius: 6px;
border: 1px solid #eee;
box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
}
.tire-size-comparison-calculator-container .result-item strong {
display: block;
margin-bottom: 5px;
color: #444;
font-size: 0.9em;
}
.tire-size-comparison-calculator-container .result-item span {
font-size: 1.1em;
color: #007bff;
font-weight: bold;
}
.tire-size-comparison-calculator-container .result-item.difference span {
color: #e74c3c; /* Red for differences */
}
.tire-size-comparison-calculator-container .result-item.speedometer span {
color: #28a745; /* Green for speedometer */
}
.tire-size-comparison-calculator-container .article-content {
margin-top: 40px;
line-height: 1.7;
color: #444;
font-size: 1em;
}
.tire-size-comparison-calculator-container .article-content h3 {
color: #2c3e50;
margin-top: 25px;
margin-bottom: 15px;
font-size: 1.5em;
}
.tire-size-comparison-calculator-container .article-content p {
margin-bottom: 15px;
}
.tire-size-comparison-calculator-container .article-content ul {
list-style-type: disc;
margin-left: 20px;
margin-bottom: 15px;
}
.tire-size-comparison-calculator-container .article-content li {
margin-bottom: 8px;
}
function calculateTireComparison() {
// Get original tire inputs
var originalTireWidth = parseFloat(document.getElementById('originalTireWidth').value);
var originalAspectRatio = parseFloat(document.getElementById('originalAspectRatio').value);
var originalWheelDiameter = parseFloat(document.getElementById('originalWheelDiameter').value);
// Get new tire inputs
var newTireWidth = parseFloat(document.getElementById('newTireWidth').value);
var newAspectRatio = parseFloat(document.getElementById('newAspectRatio').value);
var newWheelDiameter = parseFloat(document.getElementById('newWheelDiameter').value);
// Validate inputs
if (isNaN(originalTireWidth) || isNaN(originalAspectRatio) || isNaN(originalWheelDiameter) ||
isNaN(newTireWidth) || isNaN(newAspectRatio) || isNaN(newWheelDiameter) ||
originalTireWidth <= 0 || originalAspectRatio <= 0 || originalWheelDiameter <= 0 ||
newTireWidth <= 0 || newAspectRatio <= 0 || newWheelDiameter 0.05) {
speedometerErrorText = "When your speedometer reads " + originalSpeedMPH + " mph, your actual speed is " + actualSpeedMPH.toFixed(2) + " mph. (" + speedometerErrorPercentage.toFixed(2) + "% faster)";
} else if (speedometerErrorPercentage 0.01) {
groundClearanceChangeText = "+" + groundClearanceChangeInches.toFixed(2) + " inches";
} else if (groundClearanceChangeInches < -0.01) {
groundClearanceChangeText = groundClearanceChangeInches.toFixed(2) + " inches";
} else {
groundClearanceChangeText = "No significant change";
}
document.getElementById('groundClearanceChange').innerText = groundClearanceChangeText;
}
// Run calculation on page load with default values
window.onload = calculateTireComparison;
Tire Size Comparison Calculator
Original Tire Size
New Tire Size
Comparison Results
Original Tire Diameter:
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New Tire Diameter:
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Diameter Difference:
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Original Sidewall Height:
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New Sidewall Height:
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Sidewall Height Difference:
—
Original Circumference:
—
New Circumference:
—
Circumference Difference:
—
Original Revs/Mile:
—
New Revs/Mile:
—
Revs/Mile Difference:
—
Speedometer Error (at 60 mph):
—
Ground Clearance Change:
—
Understanding Your Tire Size
Tire sizing can seem like a cryptic code, but it's actually a standardized system that provides crucial information about a tire's dimensions. A common tire size, like 205/55R16, breaks down as follows:
- 205: This is the tire's section width in millimeters, measured from sidewall to sidewall.
- 55: This is the aspect ratio, representing the sidewall height as a percentage of the tire's width. In this case, the sidewall height is 55% of 205mm.
- R: Denotes a radial construction tire, which is the most common type today.
- 16: This is the diameter of the wheel (rim) in inches that the tire is designed to fit.
Why Compare Tire Sizes?
There are several reasons why vehicle owners might consider changing their tire size, or simply want to understand the implications of a different size:
- Aesthetics: Larger wheels and lower profile tires can give a vehicle a sportier or more aggressive look.
- Performance: Wider tires can offer more grip, while different aspect ratios can affect handling and ride comfort.
- Off-Roading: Taller tires increase ground clearance, which is beneficial for off-road vehicles.
- Winter Tires: Sometimes a narrower tire with a higher aspect ratio is preferred for better traction in snow.
- Replacement: Ensuring a new tire size is compatible with your vehicle and doesn't cause issues.
Impact of Changing Tire Size
Even small changes in tire dimensions can have significant effects on your vehicle's performance, safety, and even legal compliance:
- Speedometer and Odometer Error: If the new tire's overall diameter is different from the original, your speedometer will read inaccurately. A larger tire will make your speedometer read lower than your actual speed, while a smaller tire will make it read higher. This also affects your odometer, leading to incorrect mileage readings.
- Ground Clearance: A larger overall tire diameter will increase your vehicle's ground clearance, which can be good for off-roading but might raise the center of gravity. A smaller diameter will reduce it.
- Fuel Economy: Changes in tire diameter and weight can impact your vehicle's gearing and rolling resistance, potentially affecting fuel efficiency.
- Handling Characteristics: Sidewall height influences how a tire flexes. Lower profile tires (smaller aspect ratio) generally offer sharper handling but a harsher ride. Taller sidewalls provide more cushioning.
- Fitment Issues: Larger tires might rub against wheel wells, suspension components, or fender liners, especially during turns or when the suspension compresses.
- Braking Performance: A significant change in tire diameter can alter the effective leverage on your brakes, potentially affecting stopping distances.
- Traction Control/ABS: Modern vehicles rely on precise wheel speed sensor readings. A change in tire diameter can confuse these systems, leading to erratic behavior or error codes.
Always consult your vehicle manufacturer's recommendations and a professional tire specialist before making significant changes to your tire size to ensure safety and optimal performance.