Why share your location?
Better pricing
Faster delivery
Verified local shops
285/55R20 Tire Size
All You Need to Know About 285/55R20 Tires
285/55R20 tires have a section width of 285 millimetres (mm), an aspect ratio of 55%, radial construction, and a 20-inch wheel diameter. Before buying tires sized 285/55R20, converting the size into inches and comparing it with similar tire sizes like 295/55R20 and 275/45R20 helps drivers evaluate fitment, handling, and ride comfort.
Recommended 285/55R20 Tires
Well-regarded options in 285/55R20 size include:
What Are The Dimensions of 285/55R20 Tires in Inches?
285/55R20 tires have a section width of ≈ 11.22 inches, a sidewall height of ≈ 6.19 inches, and a wheel diameter of 20 inches. The overall tire diameter is ≈ 32.36 inches (typically rounded to 32.4), the circumference is ≈ 101.68 inches, and the recommended rim width range is 8.0 to 10.0 inches.
285/55R20 Tire Size Dimensions in Inches
285/55R20 Tire Size Dimensions | Dimensions in Inches (") | Formula to Convert 285/55R20 Size in Inches (") |
285 mm (section width) | ≈ 11.22" | 285 ÷ 25.4 |
157 mm (sidewall height) | ≈ 6.19" | (285 × 0.55) ÷ 25.4 |
20 (rim diameter) | 20" | Given |
822 mm (overall diameter) | ≈ 32.36" (rounded to 32.4) | (2 × 157 ÷ 25.4) + 20 |
2583 mm (circumference) | ≈ 101.68" | 32.36 × 3.1416 |
411 mm (radius) | ≈ 16.18" | 32.36 ÷ 2 |
In inches, the 285/55R20 tire size is 32.4" × 11.2" R20.
Is a 285 55 20 the same as 33 12.50 20?
No, they are not the same. While they both fit a 20-inch wheel, the 33x12.50R20 is significantly wider and slightly taller than the 285/55R20. Think of the 285/55R20 as a "Heavy” 32, while the 33x12.50 is a "True” 33.
The 285/55R20 fits almost every modern half-ton truck (F-150, Silverado, Ram) on stock suspension without rubbing, while the 33x12.50R20 will almost certainly rub on stock wheels, and the inner sidewall will likely hit the upper control arm or the frame because it is 12.5 inches wide.
Comparison of 285/55R20 With Other Tire Sizes
Comparing 285/55R20 with other tire sizes, such as 295/55R20 and 275/45R20, helps highlight how changes in width and aspect ratio affect overall tire dimensions, ride comfort, handling characteristics, and speedometer accuracy. While these sizes may share the same rim diameter, differences in sidewall height and overall diameter can significantly influence vehicle stance, clearance, and driving feel. Understanding these variations makes it easier to determine whether an alternative tire size is a suitable replacement or upgrade.
What Is The Difference Between 285/55R20 vs 295/55R20?
The main difference between 285/55R20 and 295/55R20 is the section width, with additional differences in sidewall height, overall diameter, circumference, and radius. The 295/55R20 is 10 mm (≈ 0.39") wider, has a ≈ 5 mm (≈ 0.20") taller sidewall, and an ≈ 11 mm (≈ 0.43") larger overall diameter than the 285/55R20.
Both tire sizes share the same aspect ratio and rim diameter, but the wider 295/55R20 results in a larger overall tire.
The table below shows the measurement differences between 285/55R20 and 295/55R20:
Tire Dimensions Comparison
Tire dimensions | 285/55R20 tires dimensions in millimetre (mm) and inches (") | 295/55R20 tires dimensions in millimetre (mm) and inches (") | Difference b/w 285/55R20 and 295/55R20 in millimetre (mm) and inches (") | Percentage ≈ difference |
Section Width | 285 mm (≈ 11.22") | 295 mm (≈ 11.61") | 10 mm (≈ 0.39") | ≈ 3.5% |
Sidewall Height | 157 mm (≈ 6.19") | 162 mm (≈ 6.38") | 5 mm (≈ 0.20") | ≈ 3.2% |
Overall Diameter | 822 mm (≈ 32.36") | 833 mm (≈ 32.79") | 11 mm (≈ 0.43") | ≈ 1.3% |
Circumference | 2583 mm (≈ 101.68") | 2616 mm (≈ 102.99") | 33 mm (≈ 1.31") | ≈ 1.3% |
Radius | 411 mm (≈ 16.18") | 417 mm (≈ 16.40") | 6 mm (≈ 0.22") | ≈ 1.4% |
Rim Diameter | 508 mm (20.00") | 508 mm (20.00") | – | – |
Rim Width Range | 8.0"–10.0" | 8.0"–10.0" | – | – |
Can I use 295/55R20 instead of 285/55R20?
Yes, you can use a 295/55R20 as a replacement for a 285/55R20 quite easily. The 1.3% diameter difference is negligible for your drivetrain and speedometer. However, because the 295 is a wider tire, the primary concern isn't height - it’s the "internal" clearance near your suspension.
The extra 0.4 inches of width can sometimes be tricky, depending on your wheels:
- Stock Wheels: Most factory 20-inch wheels have a high positive offset (they sit tucked into the wheel well). Because the 295 is wider, you should check the gap between the inside of the tire and your Upper Control Arm (UCA). If you can currently fit two fingers between your 285s and the suspension, the 295s will fit fine.
- Steering Lock: At a full steering lock (turning the wheel all the way left or right), the wider "shoulder" of the 295 might graze the plastic inner fender liner or a sway bar.
Recommended 295/55R20 Tires
If you plan to switch to 295/55R20 instead of 285/55R20, well-regarded options in this size include:
What Is The Difference Between 285/55R20 vs 275/45R20?
The main differences between 285/55R20 and 275/45R20 are section width and aspect ratio, which result in significant differences in sidewall height and overall diameter. The 285/55R20 has a 10 mm (≈ 0.39") wider tread, a ≈ 33 mm (≈ 1.30") taller sidewall, and a ≈ 52 mm (≈ 2.05") larger overall diameter than the 275/45R20.
Therefore, the 285/55R20 is significantly taller and wider than the 275/45R20. The table below compares the size measurements of 285/55R20 and 275/45R20.
Tire Dimensions Comparison
| Tire dimensions | 285/55R20 tires dimensions in millimetre (mm) and inches (") | 275/45R20 tires dimensions in millimetre (mm) and inches (") | Difference b/w 285/55R20 and 275/45R20 in millimetre (mm) and inches (") | Percentage ≈ difference |
| Section Width | 285 mm (≈ 11.22") | 275 mm (≈ 10.83") | 10 mm (≈ 0.39") | ≈ 3.6% |
| Sidewall Height | 157 mm (≈ 6.19") | 124 mm (≈ 4.88") | 33 mm (≈ 1.30") | ≈ 26.6% |
| Overall Diameter | 822 mm (≈ 32.36") | 770 mm (≈ 30.32") | 52 mm (≈ 2.05") | ≈ 6.8% |
| Circumference | 2583 mm (≈ 101.68") | 2418 mm (≈ 95.20") | 165 mm (≈ 6.50") | ≈ 6.8% |
| Radius | 411 mm (≈ 16.18") | 385 mm (≈ 15.16") | 26 mm (≈ 1.02") | ≈ 6.8% |
| Rim Diameter | 508 mm (20.00") | 508 mm (20.00") | – | – |
| Rim Width Range | 8.0"–10.0" | 8.0"–10.0" | – | – |
Can I use 275/45R20 instead of 285/55R20?
No. The overall diameter difference of nearly 7% is well beyond acceptable limits, and this replacement is strongly discouraged because the sizes differ significantly in both height and intended use.
A 275/45R20 is essentially a "low-profile" car or crossover tire, whereas a 285/55R20 is a "high-volume" truck or SUV tire.
The Risks of Making This Switch
- Ground Clearance & Damage: Your truck or SUV will be about 1 inch closer to the ground. This makes it more likely that you’ll scrape the front bumper on curbs or hit the undercarriage on speed bumps.
- Load Capacity: Many 275/45R20 tires are designed for lighter vehicles and may have inadequate load capacity for trucks that originally came with 285/55R20 tires. If you use 275/45R20 on a vehicle made for 285/55R20 tires, like a Tahoe, Silverado, or F-150, the tires might not support the vehicle’s weight and could blow out.
- Aesthetics: A 275/45R20 will look small in a wheel well made for a 32.4-inch tire. This creates a big gap between the tire and the fender, sometimes called "skipping leg day."
- Gearing & Transmission: With smaller tires, your engine will run at higher RPMs to keep up on the highway. This can throw off the transmission’s shifting and hurt your fuel economy.
Therefore, you should not make this swap. If you are looking for a cheaper or more common alternative to the 285/55R20, the 275/55R20 (the standard 32" truck tire) is a much safer and more appropriate choice.
All You Need to Know About 285/55R20 Tires
285/55R20 tires have a section width of 285 millimetres (mm), an aspect ratio of 55%, radial construction, and a 20-inch wheel diameter. Before buying tires sized 285/55R20, converting the size into inches and comparing it with similar tire sizes like 295/55R20 and 275/45R20 helps drivers evaluate fitment, handling, and ride comfort.
Recommended 285/55R20 Tires
Well-regarded options in 285/55R20 size include:
What Are The Dimensions of 285/55R20 Tires in Inches?
285/55R20 tires have a section width of ≈ 11.22 inches, a sidewall height of ≈ 6.19 inches, and a wheel diameter of 20 inches. The overall tire diameter is ≈ 32.36 inches (typically rounded to 32.4), the circumference is ≈ 101.68 inches, and the recommended rim width range is 8.0 to 10.0 inches.
285/55R20 Tire Size Dimensions in Inches
285/55R20 Tire Size Dimensions | Dimensions in Inches (") | Formula to Convert 285/55R20 Size in Inches (") |
285 mm (section width) | ≈ 11.22" | 285 ÷ 25.4 |
157 mm (sidewall height) | ≈ 6.19" | (285 × 0.55) ÷ 25.4 |
20 (rim diameter) | 20" | Given |
822 mm (overall diameter) | ≈ 32.36" (rounded to 32.4) | (2 × 157 ÷ 25.4) + 20 |
2583 mm (circumference) | ≈ 101.68" | 32.36 × 3.1416 |
411 mm (radius) | ≈ 16.18" | 32.36 ÷ 2 |
In inches, the 285/55R20 tire size is 32.4" × 11.2" R20.
Is a 285 55 20 the same as 33 12.50 20?
No, they are not the same. While they both fit a 20-inch wheel, the 33x12.50R20 is significantly wider and slightly taller than the 285/55R20. Think of the 285/55R20 as a "Heavy” 32, while the 33x12.50 is a "True” 33.
The 285/55R20 fits almost every modern half-ton truck (F-150, Silverado, Ram) on stock suspension without rubbing, while the 33x12.50R20 will almost certainly rub on stock wheels, and the inner sidewall will likely hit the upper control arm or the frame because it is 12.5 inches wide.
Comparison of 285/55R20 With Other Tire Sizes
Comparing 285/55R20 with other tire sizes, such as 295/55R20 and 275/45R20, helps highlight how changes in width and aspect ratio affect overall tire dimensions, ride comfort, handling characteristics, and speedometer accuracy. While these sizes may share the same rim diameter, differences in sidewall height and overall diameter can significantly influence vehicle stance, clearance, and driving feel. Understanding these variations makes it easier to determine whether an alternative tire size is a suitable replacement or upgrade.
What Is The Difference Between 285/55R20 vs 295/55R20?
The main difference between 285/55R20 and 295/55R20 is the section width, with additional differences in sidewall height, overall diameter, circumference, and radius. The 295/55R20 is 10 mm (≈ 0.39") wider, has a ≈ 5 mm (≈ 0.20") taller sidewall, and an ≈ 11 mm (≈ 0.43") larger overall diameter than the 285/55R20.
Both tire sizes share the same aspect ratio and rim diameter, but the wider 295/55R20 results in a larger overall tire.
The table below shows the measurement differences between 285/55R20 and 295/55R20:
Tire Dimensions Comparison
Tire dimensions | 285/55R20 tires dimensions in millimetre (mm) and inches (") | 295/55R20 tires dimensions in millimetre (mm) and inches (") | Difference b/w 285/55R20 and 295/55R20 in millimetre (mm) and inches (") | Percentage ≈ difference |
Section Width | 285 mm (≈ 11.22") | 295 mm (≈ 11.61") | 10 mm (≈ 0.39") | ≈ 3.5% |
Sidewall Height | 157 mm (≈ 6.19") | 162 mm (≈ 6.38") | 5 mm (≈ 0.20") | ≈ 3.2% |
Overall Diameter | 822 mm (≈ 32.36") | 833 mm (≈ 32.79") | 11 mm (≈ 0.43") | ≈ 1.3% |
Circumference | 2583 mm (≈ 101.68") | 2616 mm (≈ 102.99") | 33 mm (≈ 1.31") | ≈ 1.3% |
Radius | 411 mm (≈ 16.18") | 417 mm (≈ 16.40") | 6 mm (≈ 0.22") | ≈ 1.4% |
Rim Diameter | 508 mm (20.00") | 508 mm (20.00") | – | – |
Rim Width Range | 8.0"–10.0" | 8.0"–10.0" | – | – |
Can I use 295/55R20 instead of 285/55R20?
Yes, you can use a 295/55R20 as a replacement for a 285/55R20 quite easily. The 1.3% diameter difference is negligible for your drivetrain and speedometer. However, because the 295 is a wider tire, the primary concern isn't height - it’s the "internal" clearance near your suspension.
The extra 0.4 inches of width can sometimes be tricky, depending on your wheels:
- Stock Wheels: Most factory 20-inch wheels have a high positive offset (they sit tucked into the wheel well). Because the 295 is wider, you should check the gap between the inside of the tire and your Upper Control Arm (UCA). If you can currently fit two fingers between your 285s and the suspension, the 295s will fit fine.
- Steering Lock: At a full steering lock (turning the wheel all the way left or right), the wider "shoulder" of the 295 might graze the plastic inner fender liner or a sway bar.
Recommended 295/55R20 Tires
If you plan to switch to 295/55R20 instead of 285/55R20, well-regarded options in this size include:
What Is The Difference Between 285/55R20 vs 275/45R20?
The main differences between 285/55R20 and 275/45R20 are section width and aspect ratio, which result in significant differences in sidewall height and overall diameter. The 285/55R20 has a 10 mm (≈ 0.39") wider tread, a ≈ 33 mm (≈ 1.30") taller sidewall, and a ≈ 52 mm (≈ 2.05") larger overall diameter than the 275/45R20.
Therefore, the 285/55R20 is significantly taller and wider than the 275/45R20. The table below compares the size measurements of 285/55R20 and 275/45R20.
Tire Dimensions Comparison
| Tire dimensions | 285/55R20 tires dimensions in millimetre (mm) and inches (") | 275/45R20 tires dimensions in millimetre (mm) and inches (") | Difference b/w 285/55R20 and 275/45R20 in millimetre (mm) and inches (") | Percentage ≈ difference |
| Section Width | 285 mm (≈ 11.22") | 275 mm (≈ 10.83") | 10 mm (≈ 0.39") | ≈ 3.6% |
| Sidewall Height | 157 mm (≈ 6.19") | 124 mm (≈ 4.88") | 33 mm (≈ 1.30") | ≈ 26.6% |
| Overall Diameter | 822 mm (≈ 32.36") | 770 mm (≈ 30.32") | 52 mm (≈ 2.05") | ≈ 6.8% |
| Circumference | 2583 mm (≈ 101.68") | 2418 mm (≈ 95.20") | 165 mm (≈ 6.50") | ≈ 6.8% |
| Radius | 411 mm (≈ 16.18") | 385 mm (≈ 15.16") | 26 mm (≈ 1.02") | ≈ 6.8% |
| Rim Diameter | 508 mm (20.00") | 508 mm (20.00") | – | – |
| Rim Width Range | 8.0"–10.0" | 8.0"–10.0" | – | – |
Can I use 275/45R20 instead of 285/55R20?
No. The overall diameter difference of nearly 7% is well beyond acceptable limits, and this replacement is strongly discouraged because the sizes differ significantly in both height and intended use.
A 275/45R20 is essentially a "low-profile" car or crossover tire, whereas a 285/55R20 is a "high-volume" truck or SUV tire.
The Risks of Making This Switch
- Ground Clearance & Damage: Your truck or SUV will be about 1 inch closer to the ground. This makes it more likely that you’ll scrape the front bumper on curbs or hit the undercarriage on speed bumps.
- Load Capacity: Many 275/45R20 tires are designed for lighter vehicles and may have inadequate load capacity for trucks that originally came with 285/55R20 tires. If you use 275/45R20 on a vehicle made for 285/55R20 tires, like a Tahoe, Silverado, or F-150, the tires might not support the vehicle’s weight and could blow out.
- Aesthetics: A 275/45R20 will look small in a wheel well made for a 32.4-inch tire. This creates a big gap between the tire and the fender, sometimes called "skipping leg day."
- Gearing & Transmission: With smaller tires, your engine will run at higher RPMs to keep up on the highway. This can throw off the transmission’s shifting and hurt your fuel economy.
Therefore, you should not make this swap. If you are looking for a cheaper or more common alternative to the 285/55R20, the 275/55R20 (the standard 32" truck tire) is a much safer and more appropriate choice.
Need live support?
- Mon - Fri: 8am - 7pm ET
- Sat: 9am - 5pm ET
- Sun: Closed