195/40R14 Tire Size in Inches and Millimeters

The tire size 195/40R14 is a common specification found on various compact vehicles. Understanding this size involves breaking down each component: the width, aspect ratio, construction type, and diameter. Let's explore what each part of the 195/40R14 designation means and how to convert these measurements from metric to imperial units.

Understanding the 195/40R14 Tire Size

The tire size 195/40R14 can be broken down as follows:

• 195: This is the tire's width in millimeters. It measures 195 mm from sidewall to sidewall.

• 40: This is the aspect ratio, a percentage that represents the height of the sidewall. It is 40% of the tire's width.

• R: This indicates radial construction, which is the most common type of tire construction today.

• 14: This is the diameter of the wheel in inches that the tire is designed to fit.

How to Convert 195/40R14 Into Inches

To convert tire dimensions from metric to inches, use the conversion factor where 1 inch equals 25.4 millimeters.

Width Conversion

The width of 195 mm can be converted to inches as follows:

195 mm ÷ 25.4 = 7.68 inches

Sidewall Height Calculation

The sidewall height is 40% of the width:

195 mm × 0.40 = 78 mm

78 mm ÷ 25.4 = 3.07 inches

Overall Diameter Calculation

To find the overall diameter:

2 × Sidewall Height + Wheel Diameter = Overall Diameter

(2 × 3.07 inches) + 14 inches = 20.14 inches

Detailed Conversion Table

Quick Conversion Tips

• Remember that 1 inch equals 25.4 mm.

• To estimate tire dimensions quickly, multiply the width by the aspect ratio to get the sidewall height.

• Use the overall diameter formula: 2 × Sidewall Height + Wheel Diameter.

Technical Specifications and Dimensions

• Load Index: Typically around 78, indicating a load capacity of 425 kg (937 lbs) per tire.

• Speed Rating: H, suitable for speeds up to 210 km/h (130 mph).

• Recommended Tire Pressure: 32 PSI (220 kPa) for optimal performance and safety.

• Tread Pattern: Varies by manufacturer, typically designed for summer or all-season use.

• UTQG Ratings: Often around 300 for treadwear, A for traction, and B for temperature.

Compatible Vehicles for 195/40R14

This tire size is commonly found on compact cars and some classic vehicles. Here are some examples:

• Honda Civic: 1988-1991 models

• Volkswagen Golf: 1984-1992 models

• Mazda Miata: 1990-1997 models

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

Size Comparison and Alternatives

When looking for alternative tire sizes, it's important to stay within a 3% diameter variance to maintain speedometer accuracy and vehicle handling. Some alternatives include:

• 185/45R14

• 205/40R14

These sizes offer similar diameter measurements, ensuring compatibility with vehicles originally equipped with 195/40R14 tires.

FAQ Section

What is the recommended tire pressure for 195/40R14 tires?

The recommended tire pressure for 195/40R14 tires is typically around 32 PSI (220 kPa). Always refer to the vehicle's manual for specific recommendations, as proper tire pressure ensures optimal performance and safety.

Can I use a different tire size than 195/40R14?

Yes, you can use a different tire size, but it's crucial to ensure the new size is within a 3% diameter variance to maintain vehicle performance and safety. Alternatives like 185/45R14 or 205/40R14 may be suitable, but always consult with a tire professional.

What is the width and height of a 195/40R14 tire?

The width of a 195/40R14 tire is 195 mm (7.68 inches), and the sidewall height is 78 mm (3.07 inches). These dimensions contribute to the tire's overall diameter of approximately 512 mm (20.14 inches).

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