145R12 Tires

Understanding 145R12 tire size is crucial for making informed decisions when purchasing new tires, whether it is for replacement or upgrade, as it plays an important role in your vehicle's performance and safety. Let's explore 145R12 tire specs and dimensions, what vehicles come equipped with 145R12 tires, what are its replacement options, and where to buy 145R12 tires at lowest prices online.

Buy 145R12 Tires

How to read 145R12 tire size?

145R12 is a Metric tire size that is commonly used on passenger and crossover vehicles.

Let us decode each aspect of 145R12 tire size dimensions for better understanding:

  • 145 indicates tire's section width, which includes the entire width of the tire from one sidewall to the other. The tread width is typically a bit narrower than the section width. Section width of 145R12 tire is 145 millimeters.
  • 82 represents the aspect ratio of a tire. It is the ratio of the tire's sidewall height to its width. For 145R12 tire, the sidewall height is 82% of its tread width.
  • R denotes that tire has radial construction.
  • 12 indicates the wheel diameter in inches that the tire is designed to fit. 145R12 can be mounted on rims with 12 inches in diameter.

You can learn more about tire size markings on tire sidewall with our comprehensive guide on how to read tire size.

145R12 Tire Dimensions

Compare and visualize 145R12 tire dimensions in both inches and millimeters. Tire size calculator will help you calculate the dimensions of any tire size.

145R12 Section Width
5.7"
21.4"
145R12 Tire Side
Tire Circumference
67.2"
12"
4.7"
943 Revs/Mile
Metric Inches
Tire Width 145 mm 5.7"
Aspect Ratio 82%
Rim Diameter 305 mm 12"
Tire Diameter 543 mm 21.4"
Sidewall Height 119 mm 4.7"
Circumference 1705 mm 67.2"
Revolutions 587 per km 943 per mile

145R12 Tire Width

Tire width is the measurement of the tire's cross-section at its widest point. 145R12 tire has a width of 145 millimeters or 5.7 inches.

Tires with section width of 145 millimeters come equipped on a variety of passenger cars.

Tires with width of 145 millimeters are generally considered narrow. They offer reduced rolling resistance and better fuel or energy economy, providing sufficient grip for lighter vehicles. They are not typically used for high-performance or heavy vehicles due to their limited traction and load-bearing capabilities.

Tire width plays a pivotal role in determining a vehicle's handling, safety, and efficiency. It is crucial to consider the compatibility of tire width with the vehicle's design and the manufacturer's specifications to maintain optimal functionality and ensure safety.

Tire Width
5.7"

145R12 Aspect Ratio

Tire aspect ratio represents the height of the tire's sidewall as a percentage of its width. 145R12 tire size has an aspect ratio of 82%.

Tires with an aspect ratio of 82 are known as high-profile tires. Such tires are typically chosen for their comfort and durability, making them well-suited for everyday driving and vehicles that prioritize passenger comfort or require additional load-bearing capacity. Taller sidewall allows for more flex and absorption of road imperfections, translating to a smoother, more comfortable ride.

While these tires provide a comfortable ride, they may not offer the same level of precise handling and cornering performance as lower aspect ratio tires. The increased sidewall height can lead to more flex during aggressive maneuvers, which might not be ideal for high-speed or performance-oriented driving.

145R12 Rim Diameter

Rim diameter refers to the diameter of the wheel on which the tire is mounted, commonly measured in inches. 145R12 tire can be mounted on 12-inch wheels. The rim diameter directly correlates with the overall diameter of the tire and affects various aspects of vehicle performance and aesthetics.

Tires with rim diameter of 12 inches are equipped on a select passenger car models.

Rims with a 12-inch diameter are suitable for the lower weight and less demanding performance requirements of compact and subcompact vehicles.

When selecting a rim diameter, it's crucial to consider the vehicle's design specifications, as altering the rim size can affect the speedometer and odometer calibration, vehicle handling, suspension geometry, and brake clearance.

Rim Diameter
12"

145R12 Tire Diameter / Height

Tire diameter represens the total height of a tire, including the rim, when it is fully inflated and not under load. 145R12 tire height is 543 millimeters or 21.4 inches.

Tire height affects the clearance between the tire and the vehicle's body or chassis, influences the vehicle's ground clearance, and can impact the accuracy of the vehicle's speedometer and odometer.

For standard passenger cars, tire diameters typically range from about 24 to 30 inches. This includes sedans, hatchbacks, small SUVs, and minivans. Light trucks and larger SUVs might have tires on the higher end of this range or slightly above, often between 29 to 33 inches. Sports cars and high-performance vehicles may have similar diameter ranges as standard passenger cars, but they often feature wider tires with a lower aspect ratio, which can slightly affect the overall diameter. The range for these vehicles is typically between 24 to 30 inches, focusing more on width and profile for performance. Off-road vehicles, including larger SUVs, trucks, and specialized vehicles, often have larger tire diameters to handle rough terrain better. The diameters for these vehicles can range from about 31 to 40 inches or more, depending on the level of off-road capability and customization.

Tire Diameter
21.4"

145R12 Sidewall Height

Tire sidewall height, determined by the aspect ratio of a tire, represents the height of the tire's sidewall, measured from the edge of the rim to the top of the tread. 145R12 tire sidewall is 119 millimeters or 4.7 inches tall.

Sidewall height affects the tire's ability to dissipate heat and impacts its load-bearing capacity. It also plays a role in aesthetic appeal for many drivers, influencing the overall look of the vehicle.

Tires with a sidewall height of 4.7" offer a balance between performance and comfort, and are common on popular sedans, minivans, light trucks and SUVs.

Sidewall Height
4.7"

145R12 Circumference

Tire circumference is the total distance around the outer edge of the tire. 145R12 tire has a circumference of 1705 millimeters or 67.2 inches.

Tires with a circumference of 67.2 inches are typically found on small cars and compact vehicles. The advantage of smaller circumference tires is that they generally provide better fuel efficiency, enhanced acceleration and more responsive handling for easier maneuverability. However, they may offer less traction and a rougher ride compared to larger tires.

Tire circumference directly influences the speedometer and odometer readings of a vehicle. Mismatched tire circumferences, especially on the same axle, can lead to uneven wear, handling issues, and even mechanical damage, particularly in all-wheel or four-wheel-drive vehicles.

145R12 Circumference
Tire Circumference
67.2"

145R12 Revolutions

Tire revolutions metric reflects the number of times a tire rotates over a fixed distance. This figure is inherently tied to the tire's circumference - the larger the circumference, the fewer the revolutions needed to cover a mile, and vice versa. 145R12 tire makes 587 revolutions per kilometer or 943 revolutions per mile.

Number of the revolutions a tire makes affects greatly vehicle's performance, from speed and distance measurement accuracy to handling, fuel efficiency, and wear and tear.

What is 145R12 in inches?

When converted to inches, 145R12 tire size is equivalent to 21.4x5.7R12. 21.4 inches indicate the tire diameter, 5.7 inches represent tread width, and 12 inches is the diameter of a rim the tire can be mounted on.

Learn more about 145R12 in inches conversion.

145R12 Vehicle Fitment

There are 2 vehicle models that use 145R12 as an original equipment tire size. It's important to consult your vehicle's owner manual or a tire fitment guide specific to your car model to ensure this tire size is compatible with your vehicle. Vehicle manufacturers recommend specific tire sizes to ensure optimal performance and safety.

Select your vehicle model for its OEM tire size configuration.

What are replacement sizes for 145R12 tire?

No compatible replacement tire sizes found.

145R12 Tire Size Comparison Chart

Below is a comparison chart where we compare 145R12 tire size with other popular sizes. Green indicates that new tire diameter is within the acceptable 3% of the original, while red warns that tire will adversely affect the vehicle's speedometer reading, handling characteristics, or clearance in the wheel well. We recommend to use the tire size comparison tool to ensure proper compatibility when switching to a new tire size.

Tire Size Comparison Tire Diameter Difference
145R12 vs 175/70R13 6.1%
145R12 vs 175/65R14 7.6%
145R12 vs 175/70R14 10.9%
145R12 vs 185/60R14 6.4%
145R12 vs 185/65R14 9.8%
145R12 vs 185/70R14 13.4%
145R12 vs 195/60R14 8.7%
145R12 vs 195/70R14 16%
145R12 vs 195/75R14 19.3%

All listed guides, data and/or calculations are for informational purposes only. TireSizes.com does not warrant or make any representations regarding the accuracy of or the results of the use of this information.