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245/35R21 Tire Size
All You Need to Know About 245/35R21 Tires
245/35R21 tires have a section width of 245 millimeters (mm), an aspect ratio of 35%, radial construction, and a 21-inch wheel diameter. Before buying tires sized 245/35R21, converting 245/35R21 measurements into inches, comparing it with similar tire sizes such as 245/40R21 and 235/45R21, and researching the best 245/35R21 tires helps drivers shop for the correct fit and avoid clearance, calibration, and ride-quality issues.
What Are the Dimensions of a 245/35R21 Tire in Inches?
A 245/35R21 tire has a section width of 9.65 inches (≈ 9.6") and a sidewall height of 3.38 inches (≈ 3.4"). The overall diameter of a 245/35R21 tire is 27.75 inches (≈ 27.8"), and the circumference is approximately 87.13 inches (≈ 87.1"). The recommended rim width range for the 245/35R21 size is 8.0 to 9.5 inches. In inches, the 245/35R21 tire size can be represented as 27.8" × 9.6" R21.
How tall and wide are 245/35R21 tires?
A 245/35R21 tire is approximately 27.75 inches (704.90 mm) tall and 9.65 inches (245 mm) wide.
Best Tires for 245/35R21
Drivers running 245/35R21 typically prioritize sharp steering response, stability at speed, and controlled ride quality on large wheels. Well-regarded options in this size include:
Comparison of 245/35R21 With Similar Tire Sizes
Comparing 245/35R21 with 245/40R21 and 235/45R21 highlights how changes in aspect ratio and section width affect ride height, comfort, and vehicle calibration.
What Is the Difference Between 245/35R21 vs 245/40R21?
The main difference between 245/35R21 and 245/40R21 is the sidewall height. Both tires share the same width and rim diameter, but the higher aspect ratio of the 245/40R21 results in a taller tire.
The 245/35R21 has a sidewall height of 85.75 mm (≈ 3.38") and an overall diameter of 704.90 mm (≈ 27.75"). The 245/40R21 has a taller sidewall of 98.00 mm (≈ 3.86") and an overall diameter of 729.40 mm (≈ 28.72"). This means the 245/40R21 sidewall is 12.25 mm (≈ 0.48") taller, and the overall diameter is 24.50 mm (≈ 0.96") larger than the 245/35R21.
245/35R21 vs 245/40R21 Tire Size Comparison Table
Tire Dimensions | 245/35R21 (mm & ") | 245/40R21 (mm & ") | Difference (mm & ") | Percentage Difference |
Section Width | 245 mm (≈ 9.65") | 245 mm (≈ 9.65") | 0 | 0% |
Sidewall Height | 85.75 mm (≈ 3.38") | 98.00 mm (≈ 3.86") | 12.25 mm (≈ 0.48") | ≈ 14.3% |
Overall Diameter | 704.90 mm (≈ 27.75") | 729.40 mm (≈ 28.72") | 24.50 mm (≈ 0.96") | ≈ 3.48% |
Circumference | 2213.50 mm (≈ 87.13") | 2291.70 mm (≈ 90.23") | 78.20 mm (≈ 3.08") | ≈ 3.48% |
Radius | 352.45 mm (≈ 13.88") | 364.70 mm (≈ 14.36") | 12.25 mm (≈ 0.48") | ≈ 3.48% |
Rim Diameter | 533.4 mm (21") | 533.4 mm (21") | – | – |
Can I use 245/40R21 instead of 245/35R21?
Yes, the tire can be mounted on the same 21-inch wheels, but this change comes with important considerations. The overall diameter increase of ≈ 3.5% exceeds the commonly recommended ±3% tolerance. This may cause the speedometer to read slow, raise the ride height, and potentially affect ABS, traction-control calibration, and warranty compliance. The new 245/40R21 tire will cover 3.5% more distance per revolution; if your speedometer reads 60 mph, you will actually be traveling ≈62.1 mph.
As for the clearance, the ≈1-inch increase in diameter means the tire extends ≈0.5 inches higher, reducing the gap between the tire and the fender well above by approximately half an inch. This is a critical risk, especially for vehicles with already minimal fender clearance.
This swap should only be considered after checking vehicle manufacturer fitment guidelines and available clearance.
What Is the Difference Between 245/35R21 vs 235/45R21?
The main differences between 245/35R21 and 235/45R21 are section width, sidewall height, and overall diameter. The 245/35R21 is 245 mm wide, while the 235/45R21 is 235 mm wide. The 245/35R21 has a sidewall height of 85.75 mm (≈ 3.38") and an overall diameter of 704.90 mm (≈ 27.75"). The 235/45R21 has a much taller sidewall of 105.75 mm (≈ 4.16") and an overall diameter of 744.90 mm (≈ 29.33"). This means the 235/45R21 is 10 mm narrower, has a 20.00 mm (≈ 0.79") taller sidewall, and is 40.00 mm (≈ 1.57") taller overall.
245/35R21 vs 235/45R21 Tire Size Comparison Table
Tire Dimensions | 245/35R21 (mm & ") | 235/45R21 (mm & ") | Difference (mm & ") | Percentage Difference |
Section Width | 245 mm (≈ 9.65") | 235 mm (≈ 9.25") | 10 mm (≈ 0.39") | ≈ 4.1% |
Sidewall Height | 85.75 mm (≈ 3.38") | 105.75 mm (≈ 4.16") | 20.00 mm (≈ 0.79") | ≈ 23.3% |
Overall Diameter | 704.90 mm (≈ 27.75") | 744.90 mm (≈ 29.33") | 40.00 mm (≈ 1.57") | ≈ 5.68% |
Circumference | 2213.50 mm (≈ 87.13") | 2339.00 mm (≈ 92.10") | 125.50 mm (≈ 4.94") | ≈ 5.68% |
Radius | 352.45 mm (≈ 13.88") | 372.45 mm (≈ 14.67") | 20.00 mm (≈ 0.79") | ≈ 5.68% |
Rim Diameter | 533.4 mm (21") | 533.4 mm (21") | – | – |
Can I use 235/45R21 instead of 245/35R21?
No, this is not a practical replacement. Although a 235/45R21 tire can physically be mounted on the same 21-inch wheels, the overall diameter difference of ≈ 5.7% is well beyond accepted tolerance. The ≈1.56-inch increase in diameter reduces the gap between the tire and the fender well by over 0.75 inches. This makes rubbing almost certain, especially when turning or hitting a bump. The tire size change will also noticeably affect the speedometer (If your speedometer reads 60 mph, you would actually be traveling ≈63.4 mph), accuracy, gearing, electronic driver aids, and vehicle stance. The much taller sidewall also significantly alters handling response.
For these reasons, 235/45R21 is not a suitable substitute for 245/35R21 in normal driving conditions.
All You Need to Know About 245/35R21 Tires
245/35R21 tires have a section width of 245 millimeters (mm), an aspect ratio of 35%, radial construction, and a 21-inch wheel diameter. Before buying tires sized 245/35R21, converting 245/35R21 measurements into inches, comparing it with similar tire sizes such as 245/40R21 and 235/45R21, and researching the best 245/35R21 tires helps drivers shop for the correct fit and avoid clearance, calibration, and ride-quality issues.
What Are the Dimensions of a 245/35R21 Tire in Inches?
A 245/35R21 tire has a section width of 9.65 inches (≈ 9.6") and a sidewall height of 3.38 inches (≈ 3.4"). The overall diameter of a 245/35R21 tire is 27.75 inches (≈ 27.8"), and the circumference is approximately 87.13 inches (≈ 87.1"). The recommended rim width range for the 245/35R21 size is 8.0 to 9.5 inches. In inches, the 245/35R21 tire size can be represented as 27.8" × 9.6" R21.
How tall and wide are 245/35R21 tires?
A 245/35R21 tire is approximately 27.75 inches (704.90 mm) tall and 9.65 inches (245 mm) wide.
Best Tires for 245/35R21
Drivers running 245/35R21 typically prioritize sharp steering response, stability at speed, and controlled ride quality on large wheels. Well-regarded options in this size include:
Comparison of 245/35R21 With Similar Tire Sizes
Comparing 245/35R21 with 245/40R21 and 235/45R21 highlights how changes in aspect ratio and section width affect ride height, comfort, and vehicle calibration.
What Is the Difference Between 245/35R21 vs 245/40R21?
The main difference between 245/35R21 and 245/40R21 is the sidewall height. Both tires share the same width and rim diameter, but the higher aspect ratio of the 245/40R21 results in a taller tire.
The 245/35R21 has a sidewall height of 85.75 mm (≈ 3.38") and an overall diameter of 704.90 mm (≈ 27.75"). The 245/40R21 has a taller sidewall of 98.00 mm (≈ 3.86") and an overall diameter of 729.40 mm (≈ 28.72"). This means the 245/40R21 sidewall is 12.25 mm (≈ 0.48") taller, and the overall diameter is 24.50 mm (≈ 0.96") larger than the 245/35R21.
245/35R21 vs 245/40R21 Tire Size Comparison Table
Tire Dimensions | 245/35R21 (mm & ") | 245/40R21 (mm & ") | Difference (mm & ") | Percentage Difference |
Section Width | 245 mm (≈ 9.65") | 245 mm (≈ 9.65") | 0 | 0% |
Sidewall Height | 85.75 mm (≈ 3.38") | 98.00 mm (≈ 3.86") | 12.25 mm (≈ 0.48") | ≈ 14.3% |
Overall Diameter | 704.90 mm (≈ 27.75") | 729.40 mm (≈ 28.72") | 24.50 mm (≈ 0.96") | ≈ 3.48% |
Circumference | 2213.50 mm (≈ 87.13") | 2291.70 mm (≈ 90.23") | 78.20 mm (≈ 3.08") | ≈ 3.48% |
Radius | 352.45 mm (≈ 13.88") | 364.70 mm (≈ 14.36") | 12.25 mm (≈ 0.48") | ≈ 3.48% |
Rim Diameter | 533.4 mm (21") | 533.4 mm (21") | – | – |
Can I use 245/40R21 instead of 245/35R21?
Yes, the tire can be mounted on the same 21-inch wheels, but this change comes with important considerations. The overall diameter increase of ≈ 3.5% exceeds the commonly recommended ±3% tolerance. This may cause the speedometer to read slow, raise the ride height, and potentially affect ABS, traction-control calibration, and warranty compliance. The new 245/40R21 tire will cover 3.5% more distance per revolution; if your speedometer reads 60 mph, you will actually be traveling ≈62.1 mph.
As for the clearance, the ≈1-inch increase in diameter means the tire extends ≈0.5 inches higher, reducing the gap between the tire and the fender well above by approximately half an inch. This is a critical risk, especially for vehicles with already minimal fender clearance.
This swap should only be considered after checking vehicle manufacturer fitment guidelines and available clearance.
What Is the Difference Between 245/35R21 vs 235/45R21?
The main differences between 245/35R21 and 235/45R21 are section width, sidewall height, and overall diameter. The 245/35R21 is 245 mm wide, while the 235/45R21 is 235 mm wide. The 245/35R21 has a sidewall height of 85.75 mm (≈ 3.38") and an overall diameter of 704.90 mm (≈ 27.75"). The 235/45R21 has a much taller sidewall of 105.75 mm (≈ 4.16") and an overall diameter of 744.90 mm (≈ 29.33"). This means the 235/45R21 is 10 mm narrower, has a 20.00 mm (≈ 0.79") taller sidewall, and is 40.00 mm (≈ 1.57") taller overall.
245/35R21 vs 235/45R21 Tire Size Comparison Table
Tire Dimensions | 245/35R21 (mm & ") | 235/45R21 (mm & ") | Difference (mm & ") | Percentage Difference |
Section Width | 245 mm (≈ 9.65") | 235 mm (≈ 9.25") | 10 mm (≈ 0.39") | ≈ 4.1% |
Sidewall Height | 85.75 mm (≈ 3.38") | 105.75 mm (≈ 4.16") | 20.00 mm (≈ 0.79") | ≈ 23.3% |
Overall Diameter | 704.90 mm (≈ 27.75") | 744.90 mm (≈ 29.33") | 40.00 mm (≈ 1.57") | ≈ 5.68% |
Circumference | 2213.50 mm (≈ 87.13") | 2339.00 mm (≈ 92.10") | 125.50 mm (≈ 4.94") | ≈ 5.68% |
Radius | 352.45 mm (≈ 13.88") | 372.45 mm (≈ 14.67") | 20.00 mm (≈ 0.79") | ≈ 5.68% |
Rim Diameter | 533.4 mm (21") | 533.4 mm (21") | – | – |
Can I use 235/45R21 instead of 245/35R21?
No, this is not a practical replacement. Although a 235/45R21 tire can physically be mounted on the same 21-inch wheels, the overall diameter difference of ≈ 5.7% is well beyond accepted tolerance. The ≈1.56-inch increase in diameter reduces the gap between the tire and the fender well by over 0.75 inches. This makes rubbing almost certain, especially when turning or hitting a bump. The tire size change will also noticeably affect the speedometer (If your speedometer reads 60 mph, you would actually be traveling ≈63.4 mph), accuracy, gearing, electronic driver aids, and vehicle stance. The much taller sidewall also significantly alters handling response.
For these reasons, 235/45R21 is not a suitable substitute for 245/35R21 in normal driving conditions.
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