245/50R18 tire size
A 245/50R18 tire is 245 mm wide with a 122.5 mm sidewall, 50% of the width, on a 18-inch rim, which puts the whole tire at 702.2 mm, or about 27.6 inches, tall. No model in our data leaves the factory on it, but it can replace the original size on 12 models within 3% of the height.
Overall height
702.2 mm
27.6 in
Sidewall
122.5 mm
50%
Circumference
2,206 mm
Revs per km
453
Actual dimensions of 245/50R18
| Section width | 245 mm (9.6 in) |
| Sidewall height | 122.5 mm (4.82 in) |
| Rim diameter | 18 in (457.2 mm) |
| Overall diameter | 702.2 mm (27.6 in) |
| Circumference | 2,206 mm |
| Revolutions per km | 453 |
| Inch notation (height x width) | 27.6x9.6R18 |
Worked out: sidewall 245 x 0.5 = 122.5 mm, rim 18 x 25.4 = 457.2 mm, overall 457.2 + (122.5 x 2) = 702.2 mm, circumference 3.1416 x 702.2 = 2,206 mm. One turn of the tire moves the car about 2.21 m, which is 453 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 245/50R18 from the factory
No model sold in Thailand in our data leaves the factory on 245/50R18.
Cars that can switch to 245/50R18
These cars leave the factory on another size within 3% of the height of 245/50R18. Whether it fits still depends on rim width and wheel-well clearance.
| Model | Factory size | Height difference | Wheel |
|---|---|---|---|
| Toyota Yaris Cross HEV2023–present | 215/55R18 | +1.23% | Same wheel |
| Mazda CX-302020–present | 215/55R18 | +1.23% | Same wheel |
| BYD ATTO 32022–present | 215/55R18 | +1.23% | Same wheel |
| MG HS / HS PHEVCurrent model | 235/50R18 | +1.44% | Same wheel |
| Toyota C-HR2018–2023 | 225/50R18 | +2.93% | Same wheel |
| Toyota Corolla Cross2020–present | 225/50R18 | +2.93% | Same wheel |
| Toyota Innova Zenix HEV2023–present | 225/50R18 | +2.93% | Same wheel |
| Honda e:N12024–present | 225/50R18 | +2.93% | Same wheel |
| Honda HR-V e:HEV2022–present | 225/50R18 | +2.93% | Same wheel |
| Mitsubishi Xforce HEVCurrent model | 225/50R18 | +2.93% | Same wheel |
| BYD Seal2023–present | 225/50R18 | +2.93% | Same wheel |
| Isuzu D-Max2020–present | 215/70R16 | −0.74% | Needs 18-inch wheels |
Sizes that can replace 245/50R18
Sizes within ±3% of the overall height of 245/50R18. “At 100 km/h” is the real speed when the speedometer reads 100.
| Size | Height | Difference | At 100 km/h | Sidewall | Match | Compare |
|---|---|---|---|---|---|---|
| 225/60R17 | 701.8 mm | −0.4 mm (−0.06%) | 99.9 km/h | 135.0 mm | Very close | Compare |
| 245/45R19 | 703.1 mm | +0.9 mm (+0.13%) | 100.1 km/h | 110.3 mm | Very close | Compare |
| 245/40R20 | 704.0 mm | +1.8 mm (+0.26%) | 100.3 km/h | 98.0 mm | Very close | Compare |
| 225/55R18 | 704.7 mm | +2.5 mm (+0.36%) | 100.4 km/h | 123.8 mm | Very close | Compare |
| 235/45R19 | 694.1 mm | −8.1 mm (−1.15%) | 98.8 km/h | 105.8 mm | Close | Compare |
| 215/55R18 | 693.7 mm | −8.5 mm (−1.21%) | 98.8 km/h | 118.3 mm | Close | Compare |
| 215/65R17 | 711.3 mm | +9.1 mm (+1.30%) | 101.3 km/h | 139.8 mm | Close | Compare |
| 255/45R19 | 712.1 mm | +9.9 mm (+1.41%) | 101.4 km/h | 114.8 mm | Close | Compare |
- Keeping your wheels, the closest is 225/55R18 at 704.7 mm, +2.5 mm (+0.36%) from the original. With the speedometer on 100 km/h, the car would actually be doing about 100.4 km/h. Ground clearance rises by about 1.3 mm.
- Moving up to 19-inch wheels, the closest height match is 245/45R19 (+0.13%), with the sidewall dropping from 122.5 mm to 110.3 mm.
- Going down to 17-inch wheels, 225/60R17 (−0.06%) is the closest match and raises the sidewall to 135.0 mm.
- A larger or wider tire also changes acceleration, fuel use and steering weight, so look beyond the percentage.
Buying 245/50R18 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 245/50R18
The code after the size on the sidewall, as in 245/50R18 100V, is the load index and speed symbol. The common ratings for this size:
| Version | Index | Per tire | Four tires |
|---|---|---|---|
| Standard load (SL) | 100 | 800 kg | 3,200 kg |
| Extra load (XL) | 104 | 900 kg | 3,600 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
245/50R18 questions
How tall is a 245/50R18 tire?
About 27.6 inches, or 702.2 mm, from top to bottom before it carries weight. Each sidewall is 122.5 mm tall and the tire is 245 mm (9.6 in) wide.
Which cars use 245/50R18 tires?
No car in our data is fitted with 245/50R18 from the factory, but its height is close to the original size on Toyota Yaris Cross HEV, Mazda CX-30, BYD ATTO 3, MG HS / HS PHEV and Toyota C-HR, so it works as a replacement size.
Can I fit 225/55R18 instead of 245/50R18?
Size-wise, yes: the height differs by +0.36% (+2.5 mm), so an indicated 100 km/h is really about 100.4 km/h. The tread is 20 mm narrower. Check rim width and load index first.
How much weight can a 245/50R18 tire carry?
Most standard-load versions carry load index 100: 800 kg per tire, 3,200 kg across four. XL versions are rated 104, or 900 kg per tire. Look for the number after the size on the sidewall, as in 245/50R18 100V.
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.