Tire Size 285/40r20 in inches

The tire size 285/40R20 is equivalent to 29×11.2R20 in inches, has a diameter of 29 inches (736 mm), a section width of 11.2 inches (285 mm), a wheel diameter of 20 inches (508 mm), and is approved to be mounted on 9.5-11.0 inches (241.3 – 279.4 mm) wide wheels.

This detailed guide focuses on understanding its dimensions, relevant specifications, fitment guide, and replacement criteria.

285/40r20 in inches

This Table chart offers a dual perspective, enabling a simultaneous grasp of detailed measurements in inches and millimeters.

Feature Inches Metric
Tire Diameter 29 736
Section Width 11.2 285
Rim Height 20 508
Sidewall Height 4.5 114
Circumference 91 2312.2
Revolutions 433/km 695/mile
Rim Width Range 9.5-11.0 241.3-279.4

How Tall Is A 285/40R20 Tire?

The Tire Height of the 285/40R20 tire size is 29 inches (736 mm). This height, also referred to as the tire’s overall diameter, is derived from the sidewall height, wheel diameter, and tire tread. It is a vital factor in maintaining the speedometer accuracy of a vehicle.

What Is the 285/40R20 Width In Inches?

The 285/40R20 tire’s tread width is 11.2 inches (285 mm). This measurement signifies the width of the tire tread that comes into contact with the road surface. A wider tread width results in a larger contact area, often improving traction and stability.

What Is the 285/40R20 Sidewall Height?

The 285/40R20 tire’s sidewall height is 4.5 inches (114 mm). This is determined by the aspect ratio, which is 40 percent of the tire’s tread width. The sidewall height affects the ride comfort and road noise, as a taller sidewall generally offers a more comfortable ride.

What Is the 285/40R20 Tire Circumference?

The circumference of the 285/40R20 tire size is 91 inches (2312.2 mm). The circumference is important in defining the tire’s revolutions per mile, and understanding it can help predict a vehicle’s fuel efficiency, acceleration, and speedometer accuracy.

What Is the 285/40R20 Revolutions Per Mile?

For the 285/40R20 tire size, there are approximately 695 revolutions per mile (433 per kilometer). This specification is crucial for accurately calibrating a vehicle’s speedometer, odometer, and powertrain settings.

What Is the 285/40R20 Rims Size?

The 285/40R20 tire size the rim diameter is 20 inches (508 mm). The tire is approved to be mounted on rims with a width range of 9.5 to 11.0 inches (241.3 – 279.4 mm), which can affect the tire’s performance characteristics and the vehicle’s ride quality.

Fitment Guide
This table will guide you on which vehicles the 285/40R20 tire size can fit. It is essential to consult with your vehicle’s manufacturer guidelines or a tire professional before replacing tires, as incompatible tires can affect the safety and performance of your vehicle.

Brand Name Model
ACURA MDX (2007 – 2013)
ALFA ROMEO Stelvio (2017 – 2022)
AUDI e-tron GT (2021 – 2023), Q7 (2015 – 2018), RS e-tron GT (2021 – 2023)
BMW 7 Series (2022 – 2023), i7 (2022 – 2023), X5 M (2014 – 2019), X6 M (2014 – 2019)
BMW ALPINA XD3 (2018 – 2023), XD4 (2018 – 2023)
DODGE Dakota (1997 – 2004), Durango (1997 – 2003)
LAND ROVER Range Rover Sport (2005 – 2009)
MERCEDES-BENZ GLC-Class (2015 – 2023), GLC-Class AMG (2017 – 2023), GLC-Class Coupe (2016 – 2023), GLC-Class Coupe AMG (2016 – 2023)
PORSCHE Macan (2021 – 2023), Taycan (2020 – 2023)
ROLLS-ROYCE Dawn (2015 – 2022), Ghost (2009 – 2020), Wraith (2013 – 2022)
SAAB 9-7x (2005 – 2009)

Replacement Tire Size
Replacement tires have to be within 3% of the total diameter of the original tire size. Any replacement tire should be evaluated for load capacity, maximum speed capability, road surface compatibility, and weather conditions before installation.

Tire Size Overall Diameter Difference
295/35R20 28.1″ -3.00%
345/30R20 28.2″ -2.70%
265/40R20 28.3″ -2.20%
235/45R20 28.3″ -2.20%
305/35R20 28.4″ -1.90%
245/45R20 28.7″ -1.10%
315/35R20 28.7″ -1.10%
275/40R20 28.7″ -1.10%
255/45R20 29.1″ 0.30%
145/80R20 29.1″ 0.50%
235/50R20 29.3″ 1.10%
295/40R20 29.3″ 1.10%
265/45R20 29.4″ 1.40%
305/40R20 29.6″ 2.20%
245/50R20 29.7″ 2.40%
275/45R20 29.8″ 2.70%

Our Observation
Our examination of the 285/40R20 tire size revealed that it combines an ideal blend of height, width, and sidewall specifications to balance performance and comfort.

This tire size suits larger vehicles like SUVs, high-performance sedans, and sports cars. Its wider tread and taller sidewall add to its traction capabilities and ride comfort, making it a preferred choice for many drivers.

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