235/55R19 and 225/60R18 differ by about 1.88% in calculated nominal diameter. This is an arithmetic comparison, not an approval to replace one with the other.
Size-code geometry
| Measure | 235/55R19 | 225/60R18 |
|---|---|---|
| Nominal section width | 235 mm | 225 mm |
| Aspect ratio | 55% | 60% |
| Wheel diameter | 19.0 in | 18.0 in |
| Calculated nominal overall diameter | 29.18 in | 28.63 in |
Moving from 235/55R19 to 225/60R18 changes calculated diameter by -1.88%. If a speedometer was calibrated for the first size and reads 60 mph, a nominal ratio would imply about 58.9 mph on the second. Actual rolling circumference can differ.
Different wheel diameters: these two tires cannot mount on the same rim diameter.
Before ordering tires
Read the driver-door tire placard. Match the installed wheel, axle, tire class, load index, speed rating and any OE marking. The size alone cannot approve a replacement SKU. Tire-sidewall maximum pressure is not your vehicle’s cold inflation pressure.
Read the 235/55R19 size page and 225/60R18 size page for separately recorded vehicle applications. Use the calculator for other sizes.
Sources and scope
- Goodyear — 2025 Chevrolet Equinox: version/option and tire size (checked 2026-11-01)
- Goodyear — 2025 Honda Odyssey: version/option and tire size (checked 2026-11-01)
- Goodyear — 2025 Hyundai Tucson: version/option and tire size (checked 2026-11-01)
- Goodyear — 2025 Nissan Rogue: version/option and tire size (checked 2026-11-01)
- Goodyear — 2025 Toyota RAV4: version/option and tire size (checked 2026-11-01)
- American Honda — 2025 CR-V Specifications and Features (checked 2026-11-01)
- American Honda — 2026 CR-V Specifications (checked 2026-11-01)
- Goodyear — 2025 Subaru Outback: version/option and tire size (checked 2026-11-01)
Research checked November 2, 2026. A source-observed size is not final product fitment. Confirm the actual vehicle and current manufacturer guidance.