225/50R18 tire size
A 225/50R18 tire is 225 mm wide with a 112.5 mm sidewall, 50% of the width, on a 18-inch rim, which puts the whole tire at 682.2 mm, or about 26.9 inches, tall. Our data lists 7 models fitted with it from the factory, mostly SUVs and crossovers and MPVs.
Overall height
682.2 mm
26.9 in
Sidewall
112.5 mm
50%
Circumference
2,143 mm
Revs per km
467
Actual dimensions of 225/50R18
| Section width | 225 mm (8.9 in) |
| Sidewall height | 112.5 mm (4.43 in) |
| Rim diameter | 18 in (457.2 mm) |
| Overall diameter | 682.2 mm (26.9 in) |
| Circumference | 2,143 mm |
| Revolutions per km | 467 |
| Inch notation (height x width) | 26.9x8.9R18 |
Worked out: sidewall 225 x 0.5 = 112.5 mm, rim 18 x 25.4 = 457.2 mm, overall 457.2 + (112.5 x 2) = 682.2 mm, circumference 3.1416 x 682.2 = 2,143 mm. One turn of the tire moves the car about 2.14 m, which is 467 turns per kilometer. New to sidewall codes? See how to read a tire size.
These are nominal figures from the standard formula. Real tires vary slightly by brand and squat a little under the weight of the car.
Cars fitted with 225/50R18 from the factory
Models whose Thai-market specification lists 225/50R18; the source column links to the spec we checked.
| Model | Years | Grades | Source |
|---|---|---|---|
| Toyota C-HR | 2018–2023 | 18-inch wheel grades | headlightmag.com |
| Toyota Corolla Cross | 2020–present | 18-inch wheel grades | headlightmag.com |
| Toyota Innova Zenix HEV | 2023–present | Smart, Premium | headlightmag.com |
| Honda e:N1 | 2024–present | 18-inch wheel grades | honda.co.th |
| Honda HR-V e:HEV | 2022–present | RS | honda.co.th |
| Mitsubishi Xforce HEV | Current model | 18-inch wheel grades | mitsubishi-motors.co.th |
| BYD Seal | 2023–present | Dynamic | headlightmag.com |
Cars that can switch to 225/50R18
These cars leave the factory on another size within 3% of the height of 225/50R18. Whether it fits still depends on rim width and wheel-well clearance.
| Model | Factory size | Height difference | Wheel |
|---|---|---|---|
| MG HS / HS PHEVCurrent model | 235/50R18 | −1.44% | Same wheel |
| BYD ATTO 32022–present | 235/50R18 | −1.44% | Same wheel |
| Mazda CX-32015–present | 215/50R18 | +1.49% | Same wheel |
| ORA Good Cat2021–present | 215/50R18 | +1.49% | Same wheel |
| Toyota Yaris Cross HEV2023–present | 215/55R18 | −1.66% | Same wheel |
| Mazda CX-302020–present | 215/55R18 | −1.66% | Same wheel |
| Toyota Camry HEV2024–present | 235/45R18 | +2.02% | Same wheel |
| Honda Accord e:HEV2024–present | 235/45R18 | +2.02% | Same wheel |
| MG4 Electric2022–present | 235/45R18 | +2.02% | Same wheel |
| Tesla Model 32024–present | 235/45R18 | +2.02% | Same wheel |
| Honda BR-V2022–present | 215/55R17 | +2.08% | Needs 18-inch wheels |
| Honda HR-V2015–2021 | 215/55R17 | +2.08% | Needs 18-inch wheels |
Showing the 12 closest of 16 models.
Sizes that can replace 225/50R18
Sizes within ±3% of the overall height of 225/50R18. “At 100 km/h” is the real speed when the speedometer reads 100.
| Size | Height | Difference | At 100 km/h | Sidewall | Match | Compare |
|---|---|---|---|---|---|---|
| 245/35R20 | 679.5 mm | −2.7 mm (−0.40%) | 99.6 km/h | 85.8 mm | Very close | Compare |
| 225/45R19 | 685.1 mm | +2.9 mm (+0.43%) | 100.4 km/h | 101.3 mm | Very close | Compare |
| 225/55R17 | 679.3 mm | −2.9 mm (−0.43%) | 99.6 km/h | 123.8 mm | Very close | Compare |
| 245/40R19 | 678.6 mm | −3.6 mm (−0.53%) | 99.5 km/h | 98.0 mm | Close | Compare |
| 255/35R20 | 686.5 mm | +4.3 mm (+0.63%) | 100.6 km/h | 89.3 mm | Close | Compare |
| 255/40R19 | 686.6 mm | +4.4 mm (+0.64%) | 100.6 km/h | 102.0 mm | Close | Compare |
| 245/45R18 | 677.7 mm | −4.5 mm (−0.66%) | 99.3 km/h | 110.3 mm | Close | Compare |
| 255/45R18 | 686.7 mm | +4.5 mm (+0.66%) | 100.7 km/h | 114.8 mm | Close | Compare |
- Keeping your wheels, the closest is 245/45R18 at 677.7 mm, −4.5 mm (−0.66%) from the original. With the speedometer on 100 km/h, the car would actually be doing about 99.3 km/h. Ground clearance drops by about 2.3 mm.
- Moving up to 19-inch wheels, the closest height match is 225/45R19 (+0.43%), with the sidewall dropping from 112.5 mm to 101.3 mm.
- Going down to 17-inch wheels, 225/55R17 (−0.43%) is the closest match and raises the sidewall to 123.8 mm.
- A larger or wider tire also changes acceleration, fuel use and steering weight, so look beyond the percentage.
Buying 225/50R18 tires
Passenger tires in this size come in eco, comfort and sport lines. Japanese and European brands usually cost more than Asian ones, and the difference shows in noise, wet braking and tread life.
Check the production date in the DOT code before paying.
Check current prices
Search by brand
Links open marketplace search results; prices change constantly and not every brand makes this size.
Load index and speed rating for 225/50R18
The code after the size on the sidewall, as in 225/50R18 95V, is the load index and speed symbol. The common ratings for this size:
| Version | Index | Per tire | Four tires |
|---|---|---|---|
| Standard load (SL) | 95 | 690 kg | 2,760 kg |
| Extra load (XL) | 99 | 775 kg | 3,100 kg |
The new tire's load index and speed symbol must be no lower than the door placard, and it only carries its rated load at the correct pressure.
Common speed symbols in this size
V
240 km/h
W
270 km/h
225/50R18 questions
How tall is a 225/50R18 tire?
About 26.9 inches, or 682.2 mm, from top to bottom before it carries weight. Each sidewall is 112.5 mm tall and the tire is 225 mm (8.9 in) wide.
Which cars use 225/50R18 tires?
From Thai-market specifications, 225/50R18 comes on Toyota C-HR, Toyota Corolla Cross, Toyota Innova Zenix HEV, Honda e:N1, Honda HR-V e:HEV and Mitsubishi Xforce HEV.
Can I fit 245/45R18 instead of 225/50R18?
Size-wise, yes: the height differs by −0.66% (−4.5 mm), so an indicated 100 km/h is really about 99.3 km/h. The tread is 20 mm wider. Check rim width and load index first.
How much weight can a 225/50R18 tire carry?
Most standard-load versions carry load index 95: 690 kg per tire, 2,760 kg across four. XL versions are rated 99, or 775 kg per tire. Look for the number after the size on the sidewall, as in 225/50R18 95V.
Other 18-inch sizes
To compare other sizes yourself, use the tire size calculator; changing rim size, try plus/minus sizing; and see speedometer error by speed.