105/80R13 Tire Size in Inches and Millimeters

Understanding the 105/80R13 Tire Size

The 105/80R13 tire size is a common specification for compact vehicles and classic cars. This designation breaks down into three key components: the width (105 mm), the aspect ratio (80), and the wheel diameter (13 inches). Let's explore each component:

• Width (105 mm): The tire's width from sidewall to sidewall, measured in millimeters.

• Aspect Ratio (80): This is the height of the tire's sidewall as a percentage of the width. In this case, the sidewall height is 80% of 105 mm.

• Construction (R): The 'R' stands for radial construction, which is the most common type of tire construction today.

• Wheel Diameter (13 inches): The diameter of the wheel that the tire is designed to fit, measured in inches.

Converting 105/80R13 from Metric to Inches

To convert the tire size from metric to imperial measurements, follow these steps:

1. Convert the width from millimeters to inches:
   105 mm ÷ 25.4 = 4.13 inches

2. Calculate the sidewall height in inches:
   80% of 105 mm = 84 mm
   84 mm ÷ 25.4 = 3.31 inches

3. Determine the overall diameter:
   (2 × 3.31 inches) + 13 inches = 19.62 inches

Technical Specifications

• Load Index: Typically ranges from 75 to 79, indicating a load capacity of 387 kg to 437 kg per tire.

• Speed Rating: Commonly rated as 'T', suitable for speeds up to 118 mph (190 km/h).

• Tire Pressure: Recommended pressure is usually between 30-35 psi for optimal performance.

• Tread Pattern and Depth: Varies by manufacturer, but typically features a symmetrical tread pattern with a depth of 8-10 mm.

Compatible Vehicles for 105/80R13

The 105/80R13 tire size is compatible with various compact cars and classic vehicles. Here are some common makes and models:

• Ford Fiesta: Models from 1976 to 1989

• Volkswagen Polo: Models from 1975 to 1994

• Fiat Panda: Models from 1980 to 2003

These tires are ideal for compact vehicles due to their smaller diameter and width, providing a balance of efficiency and performance. Always verify fitment with your vehicle's manual or a tire professional.

Size Comparison and Alternatives

When considering alternative sizes, ensure the overall diameter remains within 3% of the original size to maintain speedometer accuracy and vehicle performance. Here are some alternatives:

• Alternative Size 1: 115/70R13
  Overall Diameter: 19.46 inches (within 3% variance)

• Alternative Size 2: 125/70R13
  Overall Diameter: 19.92 inches (within 3% variance)

Buying Guide and Recommendations

When purchasing 105/80R13 tires, consider the following:

• Verify the tire size on your vehicle's placard or owner's manual.

• Check the load index and speed rating to match your driving needs.

• Ensure proper tire pressure for safety and longevity.

Frequently Asked Questions

What does 105/80R13 mean?

The 105/80R13 tire size indicates a width of 105 mm, an aspect ratio of 80, radial construction, and a 13-inch wheel diameter.

How do I convert 105/80R13 to inches?

Convert the width to inches (4.13 inches), calculate the sidewall height (3.31 inches), and find the overall diameter (19.62 inches).

What vehicles use 105/80R13 tires?

Common vehicles include the Ford Fiesta (1976-1989), Volkswagen Polo (1975-1994), and Fiat Panda (1980-2003).

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