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255/35R21 Tire Size
All You Need to Know About 255/35R21 Tires
255/35R21 tires have a section width of 255 millimeters (mm), an aspect ratio of 35%, radial construction, and a 21-inch wheel diameter. Before buying tires sized 255/35R21, converting 255/35R21 measurements into inches, comparing them with similar tire sizes such as 275/35R21 and 255/40R21, and researching the best 255/35R21 tires helps drivers choose the correct fit and avoid ride-height, clearance, and calibration issues.
What Are the Dimensions of a 255/35R21 Tire in Inches?
A 255/35R21 tire has a section width of 10.04 inches (≈ 10.0") and a sidewall height of 3.51 inches (≈ 3.5"). The overall diameter of a 255/35R21 tire is 28.02 inches (≈ 28.0"), and the circumference is approximately 88.02 inches (≈ 88.0"). The recommended rim width range for the 255/35R21 size is 8.5 to 10.0 inches. In inches, the 255/35R21 tire size can be represented as 28.0" × 10.0" R21.
How tall and wide are 255/35R21 tires? A 255/35R21 tire is approximately 28.02 inches (712.9 mm) tall and 10.04 inches (255 mm) wide.
Best Tires for 255/35R21
Drivers running 255/35R21 typically prioritize sharp steering response, stability, and controlled performance on large wheels. Well-regarded options in this size include:
Comparison of 255/35R21 With Similar Tire Sizes
Comparing 255/35R21 with 275/35R21 and 255/40R21 shows how changes in width and aspect ratio affect overall diameter, handling behavior, and suitability as a replacement.
What Is the Difference Between 255/35R21 vs 275/35R21?
The main difference between 255/35R21 and 275/35R21 is the section width. The 255/35R21 is 255 mm wide, while the 275/35R21 is 275 mm wide. Both tires share the same aspect ratio and rim diameter, which means their sidewall height increases with width.
The 255/35R21 has a sidewall height of 89.25 mm (≈ 3.51") and an overall diameter of 712.9 mm (≈ 28.02"). The 275/35R21 has a sidewall height of 96.25 mm (≈ 3.79") and an overall diameter of 726.9 mm (≈ 28.62"). This means the 275/35R21 is 20 mm wider, has a 7.00 mm (≈ 0.28") taller sidewall, and is 14.00 mm (≈ 0.55") larger overall.
255/35R21 vs 275/35R21 Tire Size Comparison Table
Tire Dimensions | 255/35R21 (mm & ") | 275/35R21 (mm & ") | Difference (mm & ") | Percentage Difference |
Section Width | 255 mm (≈ 10.04") | 275 mm (≈ 10.83") | 20 mm (≈ 0.79") | ≈ 7.8% |
Sidewall Height | 89.25 mm (≈ 3.51") | 96.25 mm (≈ 3.79") | 7.00 mm (≈ 0.28") | ≈ 7.8% |
Overall Diameter | 712.9 mm (≈ 28.02") | 726.9 mm (≈ 28.62") | 14.0 mm (≈ 0.55") | ≈ 2.0% |
Circumference | 2238.5 mm (≈ 88.02") | 2282.4 mm (≈ 89.86") | 43.9 mm (≈ 1.73") | ≈ 2.0% |
Radius | 356.45 mm (≈ 14.01") | 363.45 mm (≈ 14.31") | 7.00 mm (≈ 0.28") | ≈ 2.0% |
Rim Diameter | 533.4 mm (21") | 533.4 mm (21") | – | – |
Can I use 275/35R21 instead of 255/35R21?
Yes, this is generally a workable alternative. The overall diameter difference is about 2.0%, which stays within the commonly accepted tolerance. However, the extra 20 mm of width can affect fender and suspension clearance, and steering may feel slightly heavier. As long as the wheel width is appropriate and there is enough clearance, this swap is commonly used without major drawbacks.
What Is the Difference Between 255/35R21 vs 255/40R21?
The main difference between 255/35R21 and 255/40R21 is the aspect ratio, which directly affects sidewall height and overall diameter. Both tires have the same width and rim diameter.
The 255/35R21 has a sidewall height of 89.25 mm (≈ 3.51") and an overall diameter of 712.9 mm (≈ 28.02"). The 255/40R21 has a taller sidewall of 102.00 mm (≈ 4.02") and an overall diameter of 738.9 mm (≈ 29.09"). This means the 255/40R21 sidewall is 12.75 mm (≈ 0.50") taller, and the overall diameter is 26.00 mm (≈ 1.02") larger.
255/35R21 vs 255/40R21 Tire Size Comparison Table
Tire Dimensions | 255/35R21 (mm & ") | 255/40R21 (mm & ") | Difference (mm & ") | Percentage Difference |
Section Width | 255 mm (≈ 10.04") | 255 mm (≈ 10.04") | 0 | 0% |
Sidewall Height | 89.25 mm (≈ 3.51") | 102.00 mm (≈ 4.02") | 12.75 mm (≈ 0.50") | ≈ 14.3% |
Overall Diameter | 712.9 mm (≈ 28.02") | 738.9 mm (≈ 29.09") | 26.0 mm (≈ 1.02") | ≈ 3.65% |
Circumference | 2238.5 mm (≈ 88.02") | 2320.8 mm (≈ 91.37") | 82.3 mm (≈ 3.24") | ≈ 3.65% |
Radius | 356.45 mm (≈ 14.01") | 369.45 mm (≈ 14.55") | 13.00 mm (≈ 0.51") | ≈ 3.65% |
Rim Diameter | 533.4 mm (21") | 533.4 mm (21") | – | – |
Can I use 255/40R21 instead of 255/35R21?
Marginal replacement. The overall diameter increase of ≈3.6% slightly exceeds the commonly recommended ±3% tolerance. While this tire fits the same 21-inch wheels, the change may affect speedometer accuracy (the speedometer would read ~2.1 mph slow at 60 mph), ride height, and handling response due to the taller sidewall. Check vehicle manufacturer specifications and clearance before installation. This swap may be acceptable for some applications but requires careful verification. If you decide to proceed with the 255/40R21 (the 3.6% increase) instead of 255/35R21, you are essentially trading a bit of steering precision for a slightly smoother ride.
Before buying, do this simple check:
- Turn your steering wheel to "full lock" (all the way to the left or right).
- Check the distance between the tire and the inner wheel well liner.
- If you have less than 0.75 inches of space currently, the taller 40-series tire will likely rub.
All You Need to Know About 255/35R21 Tires
255/35R21 tires have a section width of 255 millimeters (mm), an aspect ratio of 35%, radial construction, and a 21-inch wheel diameter. Before buying tires sized 255/35R21, converting 255/35R21 measurements into inches, comparing them with similar tire sizes such as 275/35R21 and 255/40R21, and researching the best 255/35R21 tires helps drivers choose the correct fit and avoid ride-height, clearance, and calibration issues.
What Are the Dimensions of a 255/35R21 Tire in Inches?
A 255/35R21 tire has a section width of 10.04 inches (≈ 10.0") and a sidewall height of 3.51 inches (≈ 3.5"). The overall diameter of a 255/35R21 tire is 28.02 inches (≈ 28.0"), and the circumference is approximately 88.02 inches (≈ 88.0"). The recommended rim width range for the 255/35R21 size is 8.5 to 10.0 inches. In inches, the 255/35R21 tire size can be represented as 28.0" × 10.0" R21.
How tall and wide are 255/35R21 tires? A 255/35R21 tire is approximately 28.02 inches (712.9 mm) tall and 10.04 inches (255 mm) wide.
Best Tires for 255/35R21
Drivers running 255/35R21 typically prioritize sharp steering response, stability, and controlled performance on large wheels. Well-regarded options in this size include:
Comparison of 255/35R21 With Similar Tire Sizes
Comparing 255/35R21 with 275/35R21 and 255/40R21 shows how changes in width and aspect ratio affect overall diameter, handling behavior, and suitability as a replacement.
What Is the Difference Between 255/35R21 vs 275/35R21?
The main difference between 255/35R21 and 275/35R21 is the section width. The 255/35R21 is 255 mm wide, while the 275/35R21 is 275 mm wide. Both tires share the same aspect ratio and rim diameter, which means their sidewall height increases with width.
The 255/35R21 has a sidewall height of 89.25 mm (≈ 3.51") and an overall diameter of 712.9 mm (≈ 28.02"). The 275/35R21 has a sidewall height of 96.25 mm (≈ 3.79") and an overall diameter of 726.9 mm (≈ 28.62"). This means the 275/35R21 is 20 mm wider, has a 7.00 mm (≈ 0.28") taller sidewall, and is 14.00 mm (≈ 0.55") larger overall.
255/35R21 vs 275/35R21 Tire Size Comparison Table
Tire Dimensions | 255/35R21 (mm & ") | 275/35R21 (mm & ") | Difference (mm & ") | Percentage Difference |
Section Width | 255 mm (≈ 10.04") | 275 mm (≈ 10.83") | 20 mm (≈ 0.79") | ≈ 7.8% |
Sidewall Height | 89.25 mm (≈ 3.51") | 96.25 mm (≈ 3.79") | 7.00 mm (≈ 0.28") | ≈ 7.8% |
Overall Diameter | 712.9 mm (≈ 28.02") | 726.9 mm (≈ 28.62") | 14.0 mm (≈ 0.55") | ≈ 2.0% |
Circumference | 2238.5 mm (≈ 88.02") | 2282.4 mm (≈ 89.86") | 43.9 mm (≈ 1.73") | ≈ 2.0% |
Radius | 356.45 mm (≈ 14.01") | 363.45 mm (≈ 14.31") | 7.00 mm (≈ 0.28") | ≈ 2.0% |
Rim Diameter | 533.4 mm (21") | 533.4 mm (21") | – | – |
Can I use 275/35R21 instead of 255/35R21?
Yes, this is generally a workable alternative. The overall diameter difference is about 2.0%, which stays within the commonly accepted tolerance. However, the extra 20 mm of width can affect fender and suspension clearance, and steering may feel slightly heavier. As long as the wheel width is appropriate and there is enough clearance, this swap is commonly used without major drawbacks.
What Is the Difference Between 255/35R21 vs 255/40R21?
The main difference between 255/35R21 and 255/40R21 is the aspect ratio, which directly affects sidewall height and overall diameter. Both tires have the same width and rim diameter.
The 255/35R21 has a sidewall height of 89.25 mm (≈ 3.51") and an overall diameter of 712.9 mm (≈ 28.02"). The 255/40R21 has a taller sidewall of 102.00 mm (≈ 4.02") and an overall diameter of 738.9 mm (≈ 29.09"). This means the 255/40R21 sidewall is 12.75 mm (≈ 0.50") taller, and the overall diameter is 26.00 mm (≈ 1.02") larger.
255/35R21 vs 255/40R21 Tire Size Comparison Table
Tire Dimensions | 255/35R21 (mm & ") | 255/40R21 (mm & ") | Difference (mm & ") | Percentage Difference |
Section Width | 255 mm (≈ 10.04") | 255 mm (≈ 10.04") | 0 | 0% |
Sidewall Height | 89.25 mm (≈ 3.51") | 102.00 mm (≈ 4.02") | 12.75 mm (≈ 0.50") | ≈ 14.3% |
Overall Diameter | 712.9 mm (≈ 28.02") | 738.9 mm (≈ 29.09") | 26.0 mm (≈ 1.02") | ≈ 3.65% |
Circumference | 2238.5 mm (≈ 88.02") | 2320.8 mm (≈ 91.37") | 82.3 mm (≈ 3.24") | ≈ 3.65% |
Radius | 356.45 mm (≈ 14.01") | 369.45 mm (≈ 14.55") | 13.00 mm (≈ 0.51") | ≈ 3.65% |
Rim Diameter | 533.4 mm (21") | 533.4 mm (21") | – | – |
Can I use 255/40R21 instead of 255/35R21?
Marginal replacement. The overall diameter increase of ≈3.6% slightly exceeds the commonly recommended ±3% tolerance. While this tire fits the same 21-inch wheels, the change may affect speedometer accuracy (the speedometer would read ~2.1 mph slow at 60 mph), ride height, and handling response due to the taller sidewall. Check vehicle manufacturer specifications and clearance before installation. This swap may be acceptable for some applications but requires careful verification. If you decide to proceed with the 255/40R21 (the 3.6% increase) instead of 255/35R21, you are essentially trading a bit of steering precision for a slightly smoother ride.
Before buying, do this simple check:
- Turn your steering wheel to "full lock" (all the way to the left or right).
- Check the distance between the tire and the inner wheel well liner.
- If you have less than 0.75 inches of space currently, the taller 40-series tire will likely rub.
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