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295/40R21 Tire Size
All You Need to Know About 295/40R21 Tires
295/40R21 tires have a section width of 295 millimeters (mm), an aspect ratio of 40%, radial construction, and a 21-inch wheel diameter. Before buying tires sized 295/40R21, converting measurements into inches, comparing them with similar tire sizes such as 295/35R21 and 275/45R21, and understanding interchangeability limits helps drivers avoid clearance, calibration, and ride-quality issues.
What Are the Dimensions of a 295/40R21 Tire in Inches?
A 295/40R21 tire has a section width of 11.61 inches (≈ 11.6") and a sidewall height of 4.65 inches (≈ 4.6"). The overall diameter of a 295/40R21 tire is 30.29 inches (≈ 30.3"), and the circumference is approximately 95.16 inches (≈ 95.2"). The recommended rim width range for the 295/40R21 size is 10.0 to 11.5 inches.
In inches, the 295/40R21 tire size can be represented as 30.3" × 11.6" R21.
How tall and wide are 295/40R21 tires?
A 295/40R21 tire is approximately 30.29 inches (769.40 mm) tall and 11.61 inches (295 mm) wide.
Comparison of 295/40R21 With Similar Tire Sizes
Comparing 295/40R21 with 295/35R21 and 275/45R21 shows how changes in aspect ratio and width influence overall diameter, ride height, and suitability as a replacement.
What Is the Difference Between 295/40R21 vs 295/35R21?
The main difference between 295/40R21 and 295/35R21 is the aspect ratio. Both tires share the same width and wheel diameter, but the lower-profile 295/35R21 results in a shorter sidewall and smaller overall diameter. The 295/40R21 has a sidewall height of 118.00 mm (≈ 4.65") and an overall diameter of 769.40 mm (≈ 30.29"). The 295/35R21 has a sidewall height of 103.25 mm (≈ 4.07") and an overall diameter of 739.90 mm (≈ 29.13").
This means the 295/35R21 sidewall is 14.75 mm (≈ 0.58") shorter, and the overall diameter is 29.50 mm (≈ 1.16") smaller.
295/40R21 vs 295/35R21 Tire Size Comparison Table
Tire Dimension | 295/40R21 (mm & in) | 295/35R21 (mm & in) | Difference (mm & in) | Percentage Difference |
Section Width | 295 mm (≈ 11.61") | 295 mm (≈ 11.61") | 0 | 0% |
Sidewall Height | 118.00 mm (≈ 4.65") | 103.25 mm (≈ 4.07") | 14.75 mm (≈ 0.58") | ≈ 12.5% |
Overall Diameter | 769.40 mm (≈ 30.29") | 739.90 mm (≈ 29.13") | 29.50 mm (≈ 1.16") | ≈ 3.83% |
Circumference | 2417.14 mm (≈ 95.16") | 2324.46 mm (≈ 91.52") | 92.68 mm (≈ 3.65") | ≈ 3.83% |
Radius | 384.70 mm (≈ 15.15") | 369.95 mm (≈ 14.57") | 14.75 mm (≈ 0.58") | ≈ 3.83% |
Rim Diameter | 21" | 21" | — | — |
Recommended Rim Width | 10.0–11.5" | 10.0–11.5" | — | — |
Can I use 295/35R21 instead of 295/40R21?
This is a borderline (marginal) substitution. The overall diameter reduction of ≈ 3.8% slightly exceeds the commonly referenced ±3% guideline. While the tire fits the same 21-inch wheels, expect the speedometer to read fast (when the dash shows 60 mph, you will actually only be traveling approximately 57.7 mph), ride height to drop noticeably, and handling to feel firmer due to the shorter sidewall. The vehicle’s chassis will sit 0.58 inches closer to the ground. For performance SUVs that often use these sizes, this can increase the risk of scraping the front air dam or underbody on steep driveways or speed bumps.
You must ensure the 295/35R21 has a high enough Load Index (typically 107 or 108 XL) to support the weight of a vehicle originally designed for the larger 295/40R21 size.
What Is the Difference Between 295/40R21 vs 275/45R21?
The main differences between 295/40R21 and 275/45R21 are section width and aspect ratio. The 275/45R21 is narrower but uses a taller sidewall, resulting in a slightly larger overall diameter. The 295/40R21 has an overall diameter of 769.40 mm (≈ 30.29").The 275/45R21 has a sidewall height of 123.75 mm (≈ 4.87") and an overall diameter of 780.90 mm (≈ 30.74").
This means the 275/45R21 is 20 mm narrower, has a 5.75 mm (≈ 0.23") taller sidewall, and is 11.50 mm (≈ 0.45") larger overall.
295/40R21 vs 275/45R21 Tire Size Comparison Table
Tire Dimension | 295/40R21 (mm & in) | 275/45R21 (mm & in) | Difference (mm & in) | Percentage Difference |
Section Width | 295 mm (≈ 11.61") | 275 mm (≈ 10.83") | 20 mm (≈ 0.79") | ≈ 6.8% |
Sidewall Height | 118.00 mm (≈ 4.65") | 123.75 mm (≈ 4.87") | 5.75 mm (≈ 0.23") | ≈ 4.9% |
Overall Diameter | 769.40 mm (≈ 30.29") | 780.90 mm (≈ 30.74") | 11.50 mm (≈ 0.45") | ≈ 1.49% |
Circumference | 2417.14 mm (≈ 95.16") | 2453.26 mm (≈ 96.59") | 36.12 mm (≈ 1.42") | ≈ 1.49% |
Radius | 384.70 mm (≈ 15.15") | 390.45 mm (≈ 15.37") | 5.75 mm (≈ 0.23") | ≈ 1.49% |
Rim Diameter | 21" | 21" | — | — |
Recommended Rim Width | 10.0–11.5" | 8.5–10.5" | — | — |
Can I use 275/45R21 instead of 295/40R21?
Yes, this is a well-within-tolerance alternative. The overall diameter increase of ≈ 1.5% has a minimal effect on speedometer accuracy and vehicle calibration. The narrower tread may slightly reduce steering weight, while the taller sidewall can improve ride comfort. As long as wheel width and clearance are appropriate, this swap is typically straightforward.
While the tires are compatible, check your wheels:
- 275/45R21 typically fits rims 8.5" to 10.5" wide.
- If your current 295 wheels are 11.0" or 11.5" wide (which some 295-series wheels are), the 275 tire will be too narrow and will be excessively stretched.
Recommended 275/45R21 Tires
If you plan to switch to 275/45R21 instead of 295/40R21, well-regarded options in this size include:
All You Need to Know About 295/40R21 Tires
295/40R21 tires have a section width of 295 millimeters (mm), an aspect ratio of 40%, radial construction, and a 21-inch wheel diameter. Before buying tires sized 295/40R21, converting measurements into inches, comparing them with similar tire sizes such as 295/35R21 and 275/45R21, and understanding interchangeability limits helps drivers avoid clearance, calibration, and ride-quality issues.
What Are the Dimensions of a 295/40R21 Tire in Inches?
A 295/40R21 tire has a section width of 11.61 inches (≈ 11.6") and a sidewall height of 4.65 inches (≈ 4.6"). The overall diameter of a 295/40R21 tire is 30.29 inches (≈ 30.3"), and the circumference is approximately 95.16 inches (≈ 95.2"). The recommended rim width range for the 295/40R21 size is 10.0 to 11.5 inches.
In inches, the 295/40R21 tire size can be represented as 30.3" × 11.6" R21.
How tall and wide are 295/40R21 tires?
A 295/40R21 tire is approximately 30.29 inches (769.40 mm) tall and 11.61 inches (295 mm) wide.
Comparison of 295/40R21 With Similar Tire Sizes
Comparing 295/40R21 with 295/35R21 and 275/45R21 shows how changes in aspect ratio and width influence overall diameter, ride height, and suitability as a replacement.
What Is the Difference Between 295/40R21 vs 295/35R21?
The main difference between 295/40R21 and 295/35R21 is the aspect ratio. Both tires share the same width and wheel diameter, but the lower-profile 295/35R21 results in a shorter sidewall and smaller overall diameter. The 295/40R21 has a sidewall height of 118.00 mm (≈ 4.65") and an overall diameter of 769.40 mm (≈ 30.29"). The 295/35R21 has a sidewall height of 103.25 mm (≈ 4.07") and an overall diameter of 739.90 mm (≈ 29.13").
This means the 295/35R21 sidewall is 14.75 mm (≈ 0.58") shorter, and the overall diameter is 29.50 mm (≈ 1.16") smaller.
295/40R21 vs 295/35R21 Tire Size Comparison Table
Tire Dimension | 295/40R21 (mm & in) | 295/35R21 (mm & in) | Difference (mm & in) | Percentage Difference |
Section Width | 295 mm (≈ 11.61") | 295 mm (≈ 11.61") | 0 | 0% |
Sidewall Height | 118.00 mm (≈ 4.65") | 103.25 mm (≈ 4.07") | 14.75 mm (≈ 0.58") | ≈ 12.5% |
Overall Diameter | 769.40 mm (≈ 30.29") | 739.90 mm (≈ 29.13") | 29.50 mm (≈ 1.16") | ≈ 3.83% |
Circumference | 2417.14 mm (≈ 95.16") | 2324.46 mm (≈ 91.52") | 92.68 mm (≈ 3.65") | ≈ 3.83% |
Radius | 384.70 mm (≈ 15.15") | 369.95 mm (≈ 14.57") | 14.75 mm (≈ 0.58") | ≈ 3.83% |
Rim Diameter | 21" | 21" | — | — |
Recommended Rim Width | 10.0–11.5" | 10.0–11.5" | — | — |
Can I use 295/35R21 instead of 295/40R21?
This is a borderline (marginal) substitution. The overall diameter reduction of ≈ 3.8% slightly exceeds the commonly referenced ±3% guideline. While the tire fits the same 21-inch wheels, expect the speedometer to read fast (when the dash shows 60 mph, you will actually only be traveling approximately 57.7 mph), ride height to drop noticeably, and handling to feel firmer due to the shorter sidewall. The vehicle’s chassis will sit 0.58 inches closer to the ground. For performance SUVs that often use these sizes, this can increase the risk of scraping the front air dam or underbody on steep driveways or speed bumps.
You must ensure the 295/35R21 has a high enough Load Index (typically 107 or 108 XL) to support the weight of a vehicle originally designed for the larger 295/40R21 size.
What Is the Difference Between 295/40R21 vs 275/45R21?
The main differences between 295/40R21 and 275/45R21 are section width and aspect ratio. The 275/45R21 is narrower but uses a taller sidewall, resulting in a slightly larger overall diameter. The 295/40R21 has an overall diameter of 769.40 mm (≈ 30.29").The 275/45R21 has a sidewall height of 123.75 mm (≈ 4.87") and an overall diameter of 780.90 mm (≈ 30.74").
This means the 275/45R21 is 20 mm narrower, has a 5.75 mm (≈ 0.23") taller sidewall, and is 11.50 mm (≈ 0.45") larger overall.
295/40R21 vs 275/45R21 Tire Size Comparison Table
Tire Dimension | 295/40R21 (mm & in) | 275/45R21 (mm & in) | Difference (mm & in) | Percentage Difference |
Section Width | 295 mm (≈ 11.61") | 275 mm (≈ 10.83") | 20 mm (≈ 0.79") | ≈ 6.8% |
Sidewall Height | 118.00 mm (≈ 4.65") | 123.75 mm (≈ 4.87") | 5.75 mm (≈ 0.23") | ≈ 4.9% |
Overall Diameter | 769.40 mm (≈ 30.29") | 780.90 mm (≈ 30.74") | 11.50 mm (≈ 0.45") | ≈ 1.49% |
Circumference | 2417.14 mm (≈ 95.16") | 2453.26 mm (≈ 96.59") | 36.12 mm (≈ 1.42") | ≈ 1.49% |
Radius | 384.70 mm (≈ 15.15") | 390.45 mm (≈ 15.37") | 5.75 mm (≈ 0.23") | ≈ 1.49% |
Rim Diameter | 21" | 21" | — | — |
Recommended Rim Width | 10.0–11.5" | 8.5–10.5" | — | — |
Can I use 275/45R21 instead of 295/40R21?
Yes, this is a well-within-tolerance alternative. The overall diameter increase of ≈ 1.5% has a minimal effect on speedometer accuracy and vehicle calibration. The narrower tread may slightly reduce steering weight, while the taller sidewall can improve ride comfort. As long as wheel width and clearance are appropriate, this swap is typically straightforward.
While the tires are compatible, check your wheels:
- 275/45R21 typically fits rims 8.5" to 10.5" wide.
- If your current 295 wheels are 11.0" or 11.5" wide (which some 295-series wheels are), the 275 tire will be too narrow and will be excessively stretched.
Recommended 275/45R21 Tires
If you plan to switch to 275/45R21 instead of 295/40R21, well-regarded options in this size include:
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