315/70R17 Tire Diameter
The 315/70R17 tire measures approximately 34.4 inches in diameter, making it nearly equivalent to a classic 35x12.50R17 tire.
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How to use this tool
- Find the three numbers on your tire sidewall (e.g. 225/45R17).
- Enter section width in mm, aspect ratio %, and wheel diameter in inches.
- The calculator returns sidewall height, overall diameter, and circumference.
The 315/70R17 is a metric near-equivalent to popular 35-inch off-road tires — verify the exact diameter before purchasing for your lifted truck or Jeep.
Frequently asked questions
- How do I read a tire size?
- A tire size like 225/45R17 means: 225 mm section width, 45% aspect ratio (sidewall height), R = radial construction, 17 inch wheel diameter.
- Why does tire diameter matter?
- Changing tire diameter affects speedometer accuracy, gear ratios, clearance, and handling. Plus-sizing (larger wheel, lower sidewall) maintains diameter while improving aesthetics and handling.