215/45R15 Tire Size in Inches and Millimeters

Understanding 215/45R15 Tire Size

The tire size 215/45R15 is a common specification used for various vehicles. Let's break down what each component means:

• 215: This is the tire's width in millimeters, measured from sidewall to sidewall.

• 45: The aspect ratio, which is the height of the sidewall as a percentage of the width. In this case, the sidewall height is 45% of 215 mm.

• R: Indicates radial construction, the most common type of tire construction.

• 15: The diameter of the wheel in inches that the tire is designed to fit.

How to Convert 215/45R15 Into Inches

To convert the tire size from metric to imperial measurements, we use the conversion factor where 1 inch equals 25.4 millimeters.

• Width: 215 mm ÷ 25.4 = 8.46 inches

• Sidewall Height: 215 mm × 0.45 = 96.75 mm ÷ 25.4 = 3.81 inches

• Overall Diameter: (2 × 3.81 inches) + 15 inches = 22.62 inches

Detailed Conversion Table

Quick Conversion Tips

• Remember that 1 inch = 25.4 mm for quick conversions.

• To estimate sidewall height, multiply the width by the aspect ratio.

• Overall diameter can be calculated by adding twice the sidewall height to the wheel diameter.

Technical Specifications and Dimensions

Here are the technical specifications for the 215/45R15 tire size:

• Width: 215 mm (8.46 inches)

• Sidewall Height: 96.75 mm (3.81 inches)

• Overall Diameter: 574.8 mm (22.62 inches)

• Load Index: Typically 84 (500 kg per tire)

• Speed Rating: V (up to 240 km/h or 149 mph)

• Tread Depth: Approximately 8-10 mm (0.31-0.39 inches)

• Maximum Load Capacity: 500 kg (1102 lbs)

• UTQG Rating: Treadwear: 300, Traction: A, Temperature: A

Compatible Vehicles for 215/45R15

The 215/45R15 tire size is commonly used on compact cars and some classic vehicles. Here are some examples:

• Honda Civic: 1992-2000 models

• Mazda MX-5 Miata: 1990-1997 models

• Toyota MR2: 1989-1999 models

When considering fitment, ensure that the wheel width and offset are compatible with the vehicle's specifications.

Size Comparison and Alternatives

When looking for alternative sizes, consider those within a 3% diameter range to maintain speedometer accuracy and vehicle performance. Some alternatives include:

• 205/50R15

• 225/40R15

Ensure that any alternative size fits the wheel and does not interfere with the vehicle's suspension or bodywork.

FAQ Section

What is the recommended tire pressure for 215/45R15 tires?

The recommended tire pressure for 215/45R15 tires typically ranges from 32 to 35 PSI (220 to 240 kPa). Always check the vehicle's owner manual or the tire placard for specific recommendations.

Can I use a different tire size than 215/45R15?

Yes, you can use a different tire size, but it should be within a 3% diameter range to ensure compatibility with your vehicle's systems. Consider consulting a tire professional for advice on alternative sizes.

What is the width and height of a 215/45R15 tire?

The width of a 215/45R15 tire is 215 mm (8.46 inches), and the sidewall height is 96.75 mm (3.81 inches). The overall diameter is 574.8 mm (22.62 inches).

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