The 285/55R20 tire comes in at 32.4 inches (822 mm) in overall diameter, with a tread width of 11.2 inches (285 mm) and a 20-inch (508 mm) rim fitment. Its sidewall stands 6.2 inches (157 mm) tall, giving the tire a circumference of 101.7 inches (2581 mm) and around 623 revolutions per mile (387 per km).
Commonly fitted on SUVs and trucks, this size provides a dependable mix of stability, traction, and ride comfort, making it a versatile choice for daily driving and light off-road use.
You can explore more details about Tire Sizes to understand the different types and dimensions for various vehicle needs.
Tire Size: 285/55R20 in Inches and Millimeters
The 285/55R20 tire size is a popular choice for trucks, SUVs, and larger vehicles due to its combination of durability, traction, and comfort. Below is a table showing the key specifications of this tire size in both inches and millimeters.
| Specification | Inches | Millimeters |
| Circumference | 101.7″ | 2581.1 mm |
| Sidewall Height | 6.2″ | 157 mm |
| Wheel Diameter | 20″ | 508 mm |
| Width | 11.2″ | 285 mm |
| Diameter | 32.4″ | 822 mm |
| Revolutions per Mile | 623 | 387 per km |
This table highlights the core dimensions and characteristics of the 285/55R20 tire, which is crucial when making a choice for your vehicle.
Why Do These Measurements Matter?
The diameter, width, and sidewall height contribute to the tire’s overall performance. A 32.4-inch diameter ensures a smooth ride by reducing the number of revolutions per mile, which helps in maintaining stability at higher speeds. The 285 mm width improves traction, making the tire ideal for off-road conditions.
What Does 285/55R20 Tire Size Mean?
The 285/55R20 tire size is commonly seen on trucks, SUVs, and larger vehicles. Here’s the breakdown:
- 285: Represents the tire’s width in millimeters (285 mm).
- 55: Indicates the aspect ratio, meaning the sidewall height is 55% of the tire’s width.
- R: Signifies the radial construction of the tire, which is the most common type of tire structure.
- 20: Refers to the diameter of the wheel in inches, meaning the tire fits a 20-inch wheel.
Why Is the 285/55R20 Tire Size Popular?
The size is favored for its balance of durability, traction, and comfort. It provides a wide footprint for better grip and handling while offering a smooth ride due to its significant sidewall height.
How to Convert 285/55R20 Tire Size to Inches?
The 285/55R20 tire size is commonly expressed in millimeters, but it’s essential to understand how these measurements convert to inches. Here’s how to convert:
- Width: 285 mm ÷ 25.4 = 11.2 inches
- Sidewall Height: 285 mm × 0.55 = 157 mm (6.2 inches)
The wheel diameter is already in inches (20 inches), so no conversion is necessary.
Why Is Conversion Important?
Understanding the tire size in inches helps with fitting tires on vehicles in countries where the imperial system is used, ensuring compatibility with wheels and other specifications.
Impact of 285/55R20 Tires on Fuel Efficiency
Larger tires like the 285/55R20 typically have more rolling resistance due to their wider tread and larger diameter. This can slightly reduce fuel efficiency.
How Does Tire Size Affect Fuel Economy?
The larger the tire, the more energy is required to rotate it, which can lead to a decrease in miles per gallon (MPG). However, the trade-off is enhanced traction, durability, and comfort, which may be more important depending on your driving conditions.
Performance Ratings of 285/55R20 Tires
When evaluating different tire models, consider the following performance metrics:
- Wet Traction: Look for tires with high wet traction ratings if you live in an area with frequent rainfall.
- Handling: Performance-oriented tires typically offer better handling, making them ideal for those who prioritize sharp turns and road grip.
- Ride Comfort: A tire with a higher aspect ratio (like the 55 in this size) will offer a more comfortable ride by absorbing more road imperfections.
- Tread Life: Tread life varies between models, so choose a tire that offers the durability needed for your driving habits.
285/55R20 vs Other Tire Sizes: How It Compares
When choosing the right tire size for your vehicle, it’s essential to compare the 285/55R20 tire size with other common sizes to understand how it impacts performance, comfort, and fuel efficiency. Below, we will compare the 285/55R20 tire against two popular alternatives: 275/60R20 and 33/12.5R20.
285/55R20 vs 275/60R20
| Feature | 285/55R20 | 275/60R20 |
| Width | 11.2 in | 10.8 in |
| Sidewall Height | 6.2 in | 7.0 in |
| Overall Diameter | 32.4 in | 32.2 in |
| Ride Comfort | Balanced | Slightly Softer |
| Fuel Efficiency | Slightly Better | Slightly Worse |
| Off-Road Performance | Good | Better Grip |
Key Takeaways:
- 275/60R20 has a taller sidewall, which improves comfort and off-road performance but slightly reduces fuel efficiency compared to 285/55R20.
- 285/55R20 offers better fuel efficiency with slightly less sidewall height, making it ideal for a balance between comfort and performance.
285/55R20 vs 33/12.5R20
| Feature | 285/55R20 | 33/12.5R20 |
| Width | 11.2 in | 12.5 in |
| Sidewall Height | 6.2 in | 8.8 in |
| Overall Diameter | 32.4 in | 33.0 in |
| Ride Comfort | Balanced | Softer |
| Fuel Efficiency | Better | Worse |
| Off-Road Performance | Good | Excellent |
Key Takeaways:
- 33/12.5R20 has a wider and taller sidewall, which enhances off-road grip and comfort, especially in rugged conditions.
- 285/55R20 is more fuel-efficient with a smaller sidewall and is better suited for those who prioritize a balance between on-road comfort and performance.
Popular Brands Offering 285/55R20 Tires
Several tire manufacturers offer the 285/55R20 size, each with different features and advantages:
- Michelin Defender LTX M/S: Known for its durability and comfort, this tire excels in wet and dry conditions, offering an excellent balance for both on-road and light off-road driving.
- Goodyear Wrangler Duratrac: Ideal for off-road use, this tire provides excellent traction in mud, snow, and rough terrain while also delivering a smooth highway experience.
- Bridgestone Dueler H/L Alenza Plus: A great option for drivers looking for an all-season tire, this model provides a comfortable ride with extended tread life and solid performance in various weather conditions.
If you’re looking for Tire Repair Service, we also offer specialized services to ensure the longevity and optimal performance of your tires.
FAQs
Q. What does 285/55R20 mean on a tire?
The 285/55R20 refers to a tire’s width (285 mm), sidewall height (55% of width), radial construction, and its compatibility with a 20-inch wheel.
Q. How tall is a 285/55R20 tire?
A 285/55R20 tire has an overall diameter of 32.4 inches (822 mm), offering a balance of comfort and stability.
Q. What are the benefits of 285/55R20 tires?
These tires offer enhanced traction, durability, and comfort, making them ideal for SUVs and trucks used in both on-road and light off-road driving.
Q. How does the 285/55R20 compare to other tire sizes?
Compared to similar sizes, the 285/55R20 strikes a good balance between ride comfort and fuel efficiency, making it versatile for various driving conditions.
