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275/55R20 Tire Size
All You Need to Know About 275/55R20 Tires
275/55R20 tires have a section width of 275 millimetres (mm), an aspect ratio of 55%, radial construction, and a 20-inch wheel diameter. Before buying tires sized 275/55R20, converting the size to inches, comparing it with similar tire sizes such as 265/50R20 and 285/55R20, and understanding the replacement effects helps drivers choose the correct setup for their vehicle.
Recommended 275/55R20 Tires
Well-regarded options in 275/55R20 size include:
What Are The Dimensions of 275/55R20 Tires in Inches?
275/55R20 tires have a section width of ≈ 10.83 inches, a sidewall height of ≈ 5.96 inches, and a wheel diameter of 20 inches. The overall tire diameter is ≈ 31.91 inches, the circumference is ≈ 100.26 inches, and the recommended rim width range is 7.5 to 9.5 inches.
In inches, the 275/55R20 tire size can be represented as 31.9" × 10.8" R20.
275/55R20 Tire Size Dimensions in Inches
275/55R20 Tire Size Dimensions | Dimensions in Inches (") | Formula to Convert 275/55R20 Size in Inches (") |
275 mm (section width) | ≈ 10.83" | 275 ÷ 25.4 |
151 mm (sidewall height) | ≈ 5.96" | (275 × 0.55) ÷ 25.4 |
20 (rim diameter) | 20" | Given |
811 mm (overall diameter) | ≈ 31.91" | (2 × 151 ÷ 25.4) + 20 |
2546 mm (circumference) | ≈ 100.26" | 31.91 × 3.1416 |
406 mm (radius) | ≈ 15.96" | 31.91 ÷ 2 |
Is a 275 55R20 tire a 33 inch tire?
Technically, no; a 275/55R20 tire is generally considered a 32-inch tire. While the 275/55R20 is very close, it falls just short of the "33-inch" category. In the truck world, sizes are often rounded, but there is a distinct difference between the 275/55R20 size and a true 33, the 275/55R20 having an actual height of ~31.9 inches. If you are looking for a metric tire that is a true 33-inch tire, you would typically look at a 275/60R20, which measures 33.0" x 10.8".
Comparison of 275/55R20 With Similar Tire Sizes
Compare 275/55R20 with sizes like 265/50R20 and 285/55R20 to understand dimensional differences and real-world effects.
What Is The Difference Between 275/55R20 vs 265/50R20?
The main differences between 275/55R20 and 265/50R20 are the section width, aspect ratio, sidewall height, and overall diameter. The 275/55R20 has a 10 mm (≈ 0.39") wider tread, an ≈ 18 mm (≈ 0.74") taller sidewall, and a ≈ 37 mm (≈ 1.46") larger overall diameter than the 265/50R20. These differences directly affect ride height, comfort, gearing, and speedometer accuracy. The 275/55R20 tire is therefore wider and taller, resulting in a larger overall diameter and circumference than the 265/50R20 size.
The tire dimensions and measurement differences between 275/55R20 and 265/50R20 are shown in the table below.
Tire Dimensions Comparison
| Tire dimensions | 275/55R20 tires dimensions in millimetre (mm) and inches (") | 265/50R20 tires dimensions in millimetre (mm) and inches (") | Difference b/w 275/55R20 and 265/50R20 in millimetre (mm) and inches (") | Percentage ≈ difference |
| Section Width | 275 mm (≈ 10.83") | 265 mm (≈ 10.43") | 10 mm (≈ 0.39") | ≈ 3.8% |
| Sidewall Height | 151 mm (≈ 5.96") | 133 mm (≈ 5.22") | 18 mm (≈ 0.74") | ≈ 13.5% |
| Overall Diameter | 811 mm (≈ 31.91") | 774 mm (≈ 30.47") | 37 mm (≈ 1.46") | ≈ 4.8% |
| Circumference | 2546 mm (≈ 100.26") | 2432 mm (≈ 95.77") | 114 mm (≈ 4.49") | ≈ 4.7% |
| Radius | 406 mm (≈ 15.96") | 387 mm (≈ 15.23") | 19 mm (≈ 0.74") | ≈ 4.9% |
| Rim Diameter | 508 mm (20.00") | 508 mm (20.00") | – | – |
| Rim Width Range | 7.5"–9.5" | 8.0"–9.5" | – | – |
Can I use 265/50R20 instead of 275/55R20?
No, using a 265/50R20 instead of a 275/55R20 is generally not recommended. The overall diameter difference of ≈ 4.8% is beyond the commonly accepted 3% tolerance, which can meaningfully affect vehicle systems.
Switching to a smaller 265/50R20 tire will:
- Lower the vehicle’s ride height by ≈ 18 mm (0.74")
- Reduce ground clearance
- Cause the speedometer to read faster than actual speed by roughly 4-5%
- Reduce ride comfort and load-carrying capability
While clearance issues inside the wheel well are unlikely, the noticeable change in diameter makes this replacement unsuitable for most vehicles without recalibration or suspension considerations.
If you must change sizes, a better alternative would be a 285/50R20 (only 1.5% smaller) or a 265/60R20 (only 1.8% larger). Both stay well within the 3% safety margin.
What Is The Difference Between 275/55R20 vs 285/55R20?
The main difference between 275/55R20 and 285/55R20 is the section width, with secondary differences in sidewall height, overall diameter, circumference, and radius. Compared to the 275/55R20, the 285/55R20 is 10 mm (≈ 0.39") wider, has a ≈ 6 mm (≈ 0.23") taller sidewall, and an ≈ 11 mm (≈ 0.45") larger overall diameter. These dimensional changes increase the contact patch and rolling circumference, which can influence grip, steering effort, and speedometer accuracy.
While both tire sizes share the same aspect ratio (55) and rim diameter (20"), the wider 285/55R20 results in a slightly taller and larger overall tire.
The tire dimensions or measurement difference between 275/55R20 vs 285/55R20 is shown in the table below.
Tire Dimensions Comparison
Tire dimensions | 275/55R20 tires dimensions in millimetre (mm) and inches (") | 285/55R20 tires dimensions in millimetre (mm) and inches (") | Difference b/w 275/55R20 and 285/55R20 in millimetre (mm) and inches (") | Percentage ≈ difference |
Section Width | 275 mm (≈ 10.83") | 285 mm (≈ 11.22") | 10 mm (≈ 0.39") | ≈ 3.6% |
Sidewall Height | 151 mm (≈ 5.96") | 157 mm (≈ 6.19") | 6 mm (≈ 0.23") | ≈ 4.0% |
Overall Diameter | 811 mm (≈ 31.91") | 822 mm (≈ 32.36") | 11 mm (≈ 0.45") | ≈ 1.4% |
Circumference | 2546 mm (≈ 100.26") | 2583 mm (≈ 101.68") | 37 mm (≈ 1.42") | ≈ 1.5% |
Radius | 406 mm (≈ 15.96") | 411 mm (≈ 16.18") | 5 mm (≈ 0.22") | ≈ 1.3% |
Rim Diameter | 508 mm (20.00") | 508 mm (20.00") | – | – |
Rim Width Range | 7.5"–9.5" | 8.0"–10.0" | – | – |
Can I use 285/55R20 instead of 275/55R20?
Yes, using a 285/55R20 instead of a 275/55R20 is generally acceptable. The overall diameter difference of ≈ 1.4% falls within the commonly accepted tolerance range and typically does not cause clearance or suspension issues.
Switching to a wider 285/55R20 tire can:
- Improve traction and stability due to the larger contact patch
- Slightly increase steering effort and rolling resistance
- Cause a minor speedometer difference of about 1-1.5%
- Have a negligible effect on ride comfort, as sidewall height increases only slightly
You actually gain a tiny bit of sidewall height (about 0.3"), which can slightly improve the "cushion" over small bumps and cracks in the road.
Recommended 285/55R20 Tires
If you plan to switch to 285/55R20 instead of 275/55R20, well-regarded options in this size include:
All You Need to Know About 275/55R20 Tires
275/55R20 tires have a section width of 275 millimetres (mm), an aspect ratio of 55%, radial construction, and a 20-inch wheel diameter. Before buying tires sized 275/55R20, converting the size to inches, comparing it with similar tire sizes such as 265/50R20 and 285/55R20, and understanding the replacement effects helps drivers choose the correct setup for their vehicle.
Recommended 275/55R20 Tires
Well-regarded options in 275/55R20 size include:
What Are The Dimensions of 275/55R20 Tires in Inches?
275/55R20 tires have a section width of ≈ 10.83 inches, a sidewall height of ≈ 5.96 inches, and a wheel diameter of 20 inches. The overall tire diameter is ≈ 31.91 inches, the circumference is ≈ 100.26 inches, and the recommended rim width range is 7.5 to 9.5 inches.
In inches, the 275/55R20 tire size can be represented as 31.9" × 10.8" R20.
275/55R20 Tire Size Dimensions in Inches
275/55R20 Tire Size Dimensions | Dimensions in Inches (") | Formula to Convert 275/55R20 Size in Inches (") |
275 mm (section width) | ≈ 10.83" | 275 ÷ 25.4 |
151 mm (sidewall height) | ≈ 5.96" | (275 × 0.55) ÷ 25.4 |
20 (rim diameter) | 20" | Given |
811 mm (overall diameter) | ≈ 31.91" | (2 × 151 ÷ 25.4) + 20 |
2546 mm (circumference) | ≈ 100.26" | 31.91 × 3.1416 |
406 mm (radius) | ≈ 15.96" | 31.91 ÷ 2 |
Is a 275 55R20 tire a 33 inch tire?
Technically, no; a 275/55R20 tire is generally considered a 32-inch tire. While the 275/55R20 is very close, it falls just short of the "33-inch" category. In the truck world, sizes are often rounded, but there is a distinct difference between the 275/55R20 size and a true 33, the 275/55R20 having an actual height of ~31.9 inches. If you are looking for a metric tire that is a true 33-inch tire, you would typically look at a 275/60R20, which measures 33.0" x 10.8".
Comparison of 275/55R20 With Similar Tire Sizes
Compare 275/55R20 with sizes like 265/50R20 and 285/55R20 to understand dimensional differences and real-world effects.
What Is The Difference Between 275/55R20 vs 265/50R20?
The main differences between 275/55R20 and 265/50R20 are the section width, aspect ratio, sidewall height, and overall diameter. The 275/55R20 has a 10 mm (≈ 0.39") wider tread, an ≈ 18 mm (≈ 0.74") taller sidewall, and a ≈ 37 mm (≈ 1.46") larger overall diameter than the 265/50R20. These differences directly affect ride height, comfort, gearing, and speedometer accuracy. The 275/55R20 tire is therefore wider and taller, resulting in a larger overall diameter and circumference than the 265/50R20 size.
The tire dimensions and measurement differences between 275/55R20 and 265/50R20 are shown in the table below.
Tire Dimensions Comparison
| Tire dimensions | 275/55R20 tires dimensions in millimetre (mm) and inches (") | 265/50R20 tires dimensions in millimetre (mm) and inches (") | Difference b/w 275/55R20 and 265/50R20 in millimetre (mm) and inches (") | Percentage ≈ difference |
| Section Width | 275 mm (≈ 10.83") | 265 mm (≈ 10.43") | 10 mm (≈ 0.39") | ≈ 3.8% |
| Sidewall Height | 151 mm (≈ 5.96") | 133 mm (≈ 5.22") | 18 mm (≈ 0.74") | ≈ 13.5% |
| Overall Diameter | 811 mm (≈ 31.91") | 774 mm (≈ 30.47") | 37 mm (≈ 1.46") | ≈ 4.8% |
| Circumference | 2546 mm (≈ 100.26") | 2432 mm (≈ 95.77") | 114 mm (≈ 4.49") | ≈ 4.7% |
| Radius | 406 mm (≈ 15.96") | 387 mm (≈ 15.23") | 19 mm (≈ 0.74") | ≈ 4.9% |
| Rim Diameter | 508 mm (20.00") | 508 mm (20.00") | – | – |
| Rim Width Range | 7.5"–9.5" | 8.0"–9.5" | – | – |
Can I use 265/50R20 instead of 275/55R20?
No, using a 265/50R20 instead of a 275/55R20 is generally not recommended. The overall diameter difference of ≈ 4.8% is beyond the commonly accepted 3% tolerance, which can meaningfully affect vehicle systems.
Switching to a smaller 265/50R20 tire will:
- Lower the vehicle’s ride height by ≈ 18 mm (0.74")
- Reduce ground clearance
- Cause the speedometer to read faster than actual speed by roughly 4-5%
- Reduce ride comfort and load-carrying capability
While clearance issues inside the wheel well are unlikely, the noticeable change in diameter makes this replacement unsuitable for most vehicles without recalibration or suspension considerations.
If you must change sizes, a better alternative would be a 285/50R20 (only 1.5% smaller) or a 265/60R20 (only 1.8% larger). Both stay well within the 3% safety margin.
What Is The Difference Between 275/55R20 vs 285/55R20?
The main difference between 275/55R20 and 285/55R20 is the section width, with secondary differences in sidewall height, overall diameter, circumference, and radius. Compared to the 275/55R20, the 285/55R20 is 10 mm (≈ 0.39") wider, has a ≈ 6 mm (≈ 0.23") taller sidewall, and an ≈ 11 mm (≈ 0.45") larger overall diameter. These dimensional changes increase the contact patch and rolling circumference, which can influence grip, steering effort, and speedometer accuracy.
While both tire sizes share the same aspect ratio (55) and rim diameter (20"), the wider 285/55R20 results in a slightly taller and larger overall tire.
The tire dimensions or measurement difference between 275/55R20 vs 285/55R20 is shown in the table below.
Tire Dimensions Comparison
Tire dimensions | 275/55R20 tires dimensions in millimetre (mm) and inches (") | 285/55R20 tires dimensions in millimetre (mm) and inches (") | Difference b/w 275/55R20 and 285/55R20 in millimetre (mm) and inches (") | Percentage ≈ difference |
Section Width | 275 mm (≈ 10.83") | 285 mm (≈ 11.22") | 10 mm (≈ 0.39") | ≈ 3.6% |
Sidewall Height | 151 mm (≈ 5.96") | 157 mm (≈ 6.19") | 6 mm (≈ 0.23") | ≈ 4.0% |
Overall Diameter | 811 mm (≈ 31.91") | 822 mm (≈ 32.36") | 11 mm (≈ 0.45") | ≈ 1.4% |
Circumference | 2546 mm (≈ 100.26") | 2583 mm (≈ 101.68") | 37 mm (≈ 1.42") | ≈ 1.5% |
Radius | 406 mm (≈ 15.96") | 411 mm (≈ 16.18") | 5 mm (≈ 0.22") | ≈ 1.3% |
Rim Diameter | 508 mm (20.00") | 508 mm (20.00") | – | – |
Rim Width Range | 7.5"–9.5" | 8.0"–10.0" | – | – |
Can I use 285/55R20 instead of 275/55R20?
Yes, using a 285/55R20 instead of a 275/55R20 is generally acceptable. The overall diameter difference of ≈ 1.4% falls within the commonly accepted tolerance range and typically does not cause clearance or suspension issues.
Switching to a wider 285/55R20 tire can:
- Improve traction and stability due to the larger contact patch
- Slightly increase steering effort and rolling resistance
- Cause a minor speedometer difference of about 1-1.5%
- Have a negligible effect on ride comfort, as sidewall height increases only slightly
You actually gain a tiny bit of sidewall height (about 0.3"), which can slightly improve the "cushion" over small bumps and cracks in the road.
Recommended 285/55R20 Tires
If you plan to switch to 285/55R20 instead of 275/55R20, well-regarded options in this size include:
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