Tire Size 255/40r13 in inches

The tire size 255/40R13, which is equivalent to 21x10R13, has a diameter of 21 inches (534.2 millimeters), a section width of 10 inches (255 millimeters), a wheel diameter of 13 inches (330 millimeters), and is approved to be mounted on 8.5-10 inches wide wheels.

The numbers in the tire size reveal essential specifications that contribute to the overall performance, safety, and comfort of the vehicle. Let’s delve into these figures in greater detail.

255/40r13 in inches

Feature Inches Metric
Tire Diameter 21 534.2
Section Width 10 255
Rim Height 13 330
Sidewall Height 4 102
Circumference 66.1 1678.2
Revolutions 961 per mile 596 per km

How Tall Is A 255/40R13 Tire?

The tire height of the 255/40R13 tire size is approximately 21 inches or 534.2 millimeters. The tire height, also referred to as the tire’s diameter, plays a crucial role in the functioning of a vehicle.

It directly impacts the speedometer readings, gearing, and the vehicle’s ability to clear obstacles. Vehicles with larger tires tend to have better off-road capabilities, while smaller tires are generally suited for standard road conditions.

The tread width of the 255/40R13 tire size is around 10 inches or 255 millimeters. The width of a tire is crucial for maintaining road grip and stability.

A wider tire provides a larger contact patch with the road, enhancing grip and stability, especially at high speeds and during turns. However, a wider tire may also lead to higher rolling resistance, affecting fuel efficiency.

What Is the 255/40R13 Sidewall Height?

The sidewall height of the 255/40R13 tire size is approximately 4 inches or 102 millimeters. Sidewall height is important because it influences the ride quality and handling of a vehicle.

A higher sidewall provides better cushioning against bumps and potholes, making for a more comfortable ride. Conversely, a lower sidewall height can lead to better handling and cornering abilities, but it might compromise ride comfort.

What Is the 255/40R13 Tire Circumference?

The circumference of the 255/40R13 tire size is roughly 66.1 inches or 1678.2 millimeters. Tire circumference affects the distance covered per tire rotation and thus directly influences the speedometer readings and fuel efficiency.

A tire with a larger circumference covers more ground in a single revolution, which can result in an understated speedometer reading if not calibrated correctly.

What Is the 255/40R13 Revolutions Per Mile?

For the 255/40R13 tire size, there are approximately 961 revolutions per mile or 596 revolutions per kilometer. The number of revolutions per mile significantly impacts the overall performance of the vehicle, including the speedometer reading, fuel efficiency, and even transmission wear.

If the revolutions per mile are higher than the vehicle’s original specification, it could lead to speedometer inaccuracies and premature wear of drivetrain components.

What Is the 255/40R13 Rims Size?

For the 255/40R13 tire size, the rim diameter is 13 inches or 330 millimeters. The rim size is critical because it dictates what size of tire can fit on it. A mismatched tire and rim size can lead to poor vehicle handling, increased tire wear, and potential tire failure.

Fitment Guide
Ensuring the proper fitment of your tires is critical for maintaining optimal vehicle performance, safety, and comfort. The 255/40R13 tire size is approved for wheel widths between 8.5 to 10 inches. Always refer to your vehicle’s owner manual or consult a tire professional to ensure proper fitment.

Replacement Tire Size
Replacement tires have to be within 3% of the total diameter of the original tires to maintain the accuracy of the vehicle’s systems. Thus, for the 255/40R13 size, the suitable replacement tire size would also need to be approximately 21 inches in diameter.

Tire Size Overall Diameter Difference
145/65R13 20.4″ (518 mm) -3%
135/70R13 20.5″ (520 mm) -2.6%
175/55R13 20.6″ (522 mm) -2.2%
165/60R13 20.8″ (528 mm) -1.1%
125/80R13 20.9″ (530 mm) -0.7%
155/65R13 20.9″ (532 mm) -0.4%
225/45R13 20.9″ (532 mm) -0.4%
145/70R13 21″ (534 mm) 0%
185/55R13 21″ (534 mm) 0%
205/50R13 21.1″ (536 mm) 0.4%
175/60R13 21.3″ (540 mm) 1.1%
165/65R13 21.4″ (544 mm) 1.9%
195/55R13 21.4″ (544 mm) 1.9%
135/80R13 21.5″ (546 mm) 2.2%
215/50R13 21.5″ (546 mm) 2.2%
155/70R13 21.6″ (548 mm) 2.6%

Our Observation
When considering the 255/40R13 tire size, it becomes clear that each dimension and specification plays a vital role in the overall performance of the vehicle. From speedometer readings to fuel efficiency, ride comfort, and vehicle handling, all these aspects are influenced by the tire size. Therefore, when selecting tires, it’s essential to consider these factors in addition to the tire’s load-carrying capacity, speed rating, and tread pattern.

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