Wheel Diameter Calculator

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Wheel Diameter Calculator body { font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif; background-color: #f8f9fa; color: #333; line-height: 1.6; margin: 0; padding: 20px; display: flex; justify-content: center; align-items: flex-start; min-height: 100vh; } .loan-calc-container { background-color: #ffffff; padding: 30px; border-radius: 8px; box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1); width: 100%; max-width: 700px; box-sizing: border-box; } h1, h2 { color: #004a99; text-align: center; margin-bottom: 20px; } .input-group { margin-bottom: 20px; display: flex; flex-direction: column; align-items: flex-start; } .input-group label { margin-bottom: 8px; font-weight: bold; color: #004a99; } .input-group input[type="number"] { width: 100%; padding: 12px; border: 1px solid #ccc; border-radius: 4px; box-sizing: border-box; font-size: 1rem; } button { background-color: #004a99; color: white; padding: 12px 20px; border: none; border-radius: 4px; cursor: pointer; font-size: 1.1rem; width: 100%; margin-top: 10px; transition: background-color 0.3s ease; } button:hover { background-color: #003366; } #result { margin-top: 30px; padding: 20px; background-color: #e9ecef; border: 1px solid #dee2e6; border-radius: 8px; text-align: center; font-size: 1.8rem; font-weight: bold; color: #28a745; min-height: 60px; display: flex; justify-content: center; align-items: center; } .article-content { margin-top: 40px; padding-top: 30px; border-top: 1px solid #eee; } .article-content h2 { text-align: left; color: #004a99; margin-bottom: 15px; } .article-content p, .article-content ul { margin-bottom: 15px; } .article-content code { background-color: #e9ecef; padding: 2px 6px; border-radius: 3px; font-family: Consolas, Monaco, 'Andale Mono', 'Ubuntu Mono', monospace; } @media (max-width: 600px) { .loan-calc-container { padding: 20px; } h1 { font-size: 1.8rem; } #result { font-size: 1.5rem; } }

Wheel Diameter Calculator

Enter values to see the result

Understanding Wheel Diameter Calculation

This calculator helps determine the overall diameter of a tire and wheel assembly. This is crucial for several reasons:

  • Vehicle Performance: Different tire sizes can affect speedometer readings, odometer accuracy, and overall gearing.
  • Vehicle Clearance: Ensuring new tire/wheel combinations fit within the vehicle's fender wells and suspension components.
  • Tire Matching: Confirming that a new tire size maintains a similar overall diameter to the original equipment (OE) for consistent handling and stability.

How the Calculation Works

The overall diameter of a tire is calculated using the tire's width, aspect ratio, and the rim's diameter. The formula breaks down as follows:

  1. Calculate Tire Section Height: This is the height of the tire's sidewall. Tire Height (mm) = (Tire Width (mm) * Aspect Ratio (%)) / 100
  2. Convert Tire Height to Inches: Since the rim diameter is in inches, we need to convert the tire height to inches. Tire Height (inches) = Tire Height (mm) / 25.4 (There are 25.4 mm in an inch)
  3. Calculate Total Tire Diameter: The total diameter is the rim diameter plus the height of the tire on both sides of the rim. Total Diameter (inches) = Rim Diameter (inches) + (2 * Tire Height (inches))

So, the combined formula is:

Total Diameter (inches) = Rim Diameter (inches) + (2 * ((Tire Width (mm) * Aspect Ratio (%)) / 100) / 25.4)

Example Calculation:

Let's say you have a tire with the following specifications:

  • Tire Width: 205 mm
  • Aspect Ratio: 55 %
  • Rim Diameter: 17 inches

Step 1: Tire Height (mm) = (205 * 55) / 100 = 112.75 mm

Step 2: Tire Height (inches) = 112.75 / 25.4 ≈ 4.44 inches

Step 3: Total Diameter (inches) = 17 + (2 * 4.44) = 17 + 8.88 = 25.88 inches

Therefore, a 205/55R17 tire on a 17-inch rim has an approximate overall diameter of 25.88 inches.

function calculateWheelDiameter() { var tireWidth = parseFloat(document.getElementById("tireWidth").value); var aspectRatio = parseFloat(document.getElementById("aspectRatio").value); var rimDiameter = parseFloat(document.getElementById("rimDiameter").value); var resultElement = document.getElementById("result"); if (isNaN(tireWidth) || isNaN(aspectRatio) || isNaN(rimDiameter) || tireWidth <= 0 || aspectRatio <= 0 || rimDiameter <= 0) { resultElement.innerHTML = "Please enter valid positive numbers."; resultElement.style.color = "#dc3545"; /* Red for error */ return; } // Calculate tire section height in mm var tireHeightMM = (tireWidth * aspectRatio) / 100; // Convert tire height from mm to inches var tireHeightInches = tireHeightMM / 25.4; // Calculate total wheel assembly diameter in inches var totalDiameterInches = rimDiameter + (2 * tireHeightInches); // Display the result resultElement.innerHTML = totalDiameterInches.toFixed(2) + " inches"; resultElement.style.color = "#28a745"; /* Success green */ }

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