195/45R15 in inches & centimeters
Reference size: 195/45R15 has a nominal diameter of 21.91 inches and width of 7.68 inches, with a 3.45-inch sidewall on a 15-inch wheel.
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Nominal dimensions · 195/45R15
Side view
DOverall diameter21.91 in55.65 cm
SSidewall height3.45 in8.78 cm
WDWheel diameter15.00 in38.10 cm
Front view
DOverall diameter21.91 in55.65 cm
WSection width7.68 in19.50 cm
- DOverall diameter
- 21.91 in55.65 cm
- WSection width
- 7.68 in19.50 cm
- SSidewall height
- 3.45 in8.78 cm
- WDWheel diameter
- 15.00 in38.10 cm
- CCircumference
- 68.83 in174.83 cm
Approximate inch notation≈ 21.91 × 7.68R15
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
Compare these dimensions with the tire manufacturer’s published measurements and your vehicle’s tire and wheel specifications.
Detailed measurements and formulas for 195/45R15
Reference size: 195/45R15
| Measurement | inches | centimeters | millimeters |
|---|---|---|---|
| Overall diameter | 21.91 in | 55.65 cm | 556.5 mm |
| Section width | 7.68 in | 19.50 cm | 195.0 mm |
| Sidewall height | 3.45 in | 8.78 cm | 87.8 mm |
| Circumference | 68.83 in | 174.83 cm | 1,748.3 mm |
| Wheel diameter | 15.00 in | 38.10 cm | 381.0 mm |
| Revolutions / mi | 920.5 | ||
| Revolutions / km | 572.0 | ||
How we calculate it
195 = section width in millimeters; 45 = sidewall as a percentage of width; 15 = wheel diameter in inches.
Sidewall height: 195 × 45/100 = 87.75 mm
Overall diameter: (15 × 25.4) + (2 × 87.75) = 556.5 mm
Circumference: π × 556.5 ≈ 1,748.3 mm
Read the size-code guide Overall diameter: (15 × 25.4) + (2 × 87.75) = 556.5 mm
Circumference: π × 556.5 ≈ 1,748.3 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 195/45R15
Sorted by nominal diameter difference. Compare the tire maker’s published dimensions for the sizes you shortlist.