245/35R18 in inches & centimeters
Reference size: 245/35R18 has a nominal diameter of 24.75 inches and width of 9.65 inches, with a 3.38-inch sidewall on a 18-inch wheel.
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Nominal dimensions · 245/35R18
Side view
DOverall diameter24.75 in62.87 cm
SSidewall height3.38 in8.58 cm
WDWheel diameter18.00 in45.72 cm
Front view
DOverall diameter24.75 in62.87 cm
WSection width9.65 in24.50 cm
- DOverall diameter
- 24.75 in62.87 cm
- WSection width
- 9.65 in24.50 cm
- SSidewall height
- 3.38 in8.58 cm
- WDWheel diameter
- 18.00 in45.72 cm
- CCircumference
- 77.76 in197.51 cm
Approximate inch notation≈ 24.75 × 9.65R18
Diameter × width, with wheel diameter in inches, derived from the nominal size code. Use the tire maker’s catalog to choose an available product size.
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Nearby sizes
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Detailed measurements and formulas for 245/35R18
Reference size: 245/35R18
| Measurement | inches | centimeters | millimeters |
|---|---|---|---|
| Overall diameter | 24.75 in | 62.87 cm | 628.7 mm |
| Section width | 9.65 in | 24.50 cm | 245.0 mm |
| Sidewall height | 3.38 in | 8.58 cm | 85.8 mm |
| Circumference | 77.76 in | 197.51 cm | 1,975.1 mm |
| Wheel diameter | 18.00 in | 45.72 cm | 457.2 mm |
| Revolutions / mi | 814.8 | ||
| Revolutions / km | 506.3 | ||
How we calculate it
245 = section width in millimeters; 35 = sidewall as a percentage of width; 18 = wheel diameter in inches.
Sidewall height: 245 × 35/100 = 85.75 mm
Overall diameter: (18 × 25.4) + (2 × 85.75) = 628.7 mm
Circumference: π × 628.7 ≈ 1,975.1 mm
Read the size-code guide Overall diameter: (18 × 25.4) + (2 × 85.75) = 628.7 mm
Circumference: π × 628.7 ≈ 1,975.1 mm
Reference model marked 245/40 ZR18 97Y.
Product image: Continental Tire
Tread-detail reference. Section width is calculated separately.
Product image: Continental TireWhat to check before changing size
Use the vehicle and tire specifications to check these three points:
- Vehicle placard and manual: match an approved size and the required load and speed ratings.
- Wheel specifications: check the tire maker’s wheel-width range and the wheel offset.
- Available space: check clearance at full steering lock and throughout suspension travel.
Method / data
Dimensions are calculated from the nominal size code. The reference catalog lists size codes; the tire maker’s specification sheet gives the exact model’s published measurements.
Calculation method and reference dataNearby sizes for 245/35R18
Sorted by nominal diameter difference. Compare the tire maker’s published dimensions for the sizes you shortlist.