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All You Need To Know About 315/70R17 Tire Size

The 315/70R17 tire size is 315 mm wide, has a 70% aspect ratio, fits a 17-inch wheel, measures approximately 34.4 inches in overall diameter, and has a sidewall approximately 8.7 inches high. The 315/70R17 designation uses metric sizing without a P or LT prefix. A separate LT315/70R17 size also exists, but its Light Truck designation involves different load-capacity and inflation requirements that must be checked independently.

315/70R17 Size Quick Specs

What Vehicles Use 315/70R17 Tires?

The 315/70R17 tire size is documented as a factory tire size for specific configurations of the vehicles below.

• Ford Bronco
• Jeep Wrangler
• GMC Canyon

To check whether the 315/70R17 tire size is a factory fitment for your specific vehicle, use our VIN lookup tool.

315/70R17 Dimensions in Inches

The 315/70R17 tire size is approximately 12.4 inches wide, 34.4 inches tall overall, with a sidewall approximately 8.7 inches high. The 17-inch figure identifies the wheel diameter that the 315/70R17 tire is designed to fit.

315/70R17 Tire Size Measurements

• Section Width: Approx. 12.4 inches
• Sidewall Height: Approx. 8.7 inches
• Overall Diameter: Approx. 34.4 inches
• Circumference: Approx. 108.0 inches
• Wheel Diameter: 17 inches

315/70R17 Alternative Tire Sizes

Drivers comparing 315/70R17 alternatives frequently consider 285/70R17 and 35X12.50R17. The 285/70R17 is narrower and shorter than 315/70R17, and its overall-diameter difference falls outside the commonly used ±3% guideline. The 35X12.50R17 has nearly the same nominal width and is slightly taller, remaining within that guideline. The ±3% tire-size guideline is only a starting point; neither comparison alone confirms interchangeability with 315/70R17.

315/70R17 vs 285/70R17

The 285/70R17 overall diameter is 4.81% smaller than the 315/70R17 overall diameter, placing the difference outside the commonly used ±3% guideline.

• Width Difference: The 285/70R17 is 30 mm narrower than the 315/70R17.
• Diameter Difference: The 285/70R17 is approximately 1.7 inches smaller in overall diameter than the 315/70R17, a difference of 4.81%.
• Interchangeability: The 285/70R17 falls outside the commonly used ±3% guideline and is generally not recommended as a direct size swap for 315/70R17. The diameter change can affect speedometer accuracy, vehicle clearance, gearing, and systems calibrated around the original tire diameter. The 35X12.50R17 is a closer size to compare with 315/70R17, with an overall-diameter difference of 1.86%, which remains within the ±3% guideline.
• Practical Difference: The 285/70R17 is approximately 1.2 inches narrower and 1.7 inches shorter overall than the 315/70R17.

315/70R17 vs 35X12.50R17

The 35X12.50R17 nominal overall diameter is 1.86% larger than the calculated 315/70R17 overall diameter, placing the difference within the commonly used ±3% guideline.

• Width Difference: The 35X12.50R17 nominal width is approximately 0.1 inch wider than the 315/70R17 nominal width.
• Diameter Difference: The 35X12.50R17 is approximately 0.6 inch larger in nominal overall diameter than the 315/70R17, a difference of 1.86%.
• Interchangeability: The diameter difference between 35X12.50R17 and 315/70R17 falls within the commonly used ±3% guideline, but the percentage alone does not confirm interchangeability. Wheel-width compatibility, load capacity, inflation requirements, radial and lateral clearance, and vehicle-specific requirements must still be checked.
• Practical Difference: The 35X12.50R17 is nominally about 0.1 inch wider and 0.6 inch taller overall than the calculated dimensions of 315/70R17.