215/40R18 tire size
A 215/40R18 tire is 215 mm wide with a 86.0 mm sidewall, 40% of the width, on a 18-inch rim, which puts the whole tire at 629.2 mm, or about 24.8 inches, tall. No model in our data leaves the factory on it, but it can replace the original size on 8 models within 3% of the height.
Overall height
629.2 mm
24.8 in
Sidewall
86.0 mm
40%
Circumference
1,977 mm
Revs per km
506
Actual dimensions of 215/40R18
| Section width | 215 mm (8.5 in) |
| Sidewall height | 86.0 mm (3.39 in) |
| Rim diameter | 18 in (457.2 mm) |
| Overall diameter | 629.2 mm (24.8 in) |
| Circumference | 1,977 mm |
| Revolutions per km | 506 |
| Inch notation (height x width) | 24.8x8.5R18 |
Worked out: sidewall 215 x 0.4 = 86 mm, rim 18 x 25.4 = 457.2 mm, overall 457.2 + (86 x 2) = 629.2 mm, circumference 3.1416 x 629.2 = 1,977 mm. One turn of the tire moves the car about 1.98 m, which is 506 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 215/40R18 from the factory
No model sold in Thailand in our data leaves the factory on 215/40R18.
Cars that can switch to 215/40R18
These cars leave the factory on another size within 3% of the height of 215/40R18. Whether it fits still depends on rim width and wheel-well clearance.
| Model | Factory size | Height difference | Wheel |
|---|---|---|---|
| Honda City / City Hatchback2023–present | 185/60R16 | +0.13% | Needs 18-inch wheels |
| Mazda22015–present | 185/60R16 | +0.13% | Needs 18-inch wheels |
| Toyota Veloz2022–present | 205/50R17 | −1.19% | Needs 18-inch wheels |
| Toyota Yaris ATIV HEV2025–present | 205/50R17 | −1.19% | Needs 18-inch wheels |
| BYD Dolphin2023–present | 205/50R17 | −1.19% | Needs 18-inch wheels |
| MG3 HYBRID+Current model | 195/55R16 | +1.34% | Needs 18-inch wheels |
| Toyota Yaris ATIV2022–present | 195/60R16 | −1.75% | Needs 18-inch wheels |
| Suzuki XL72020–present | 195/60R16 | −1.75% | Needs 18-inch wheels |
Sizes that can replace 215/40R18
Sizes within ±3% of the overall height of 215/40R18. “At 100 km/h” is the real speed when the speedometer reads 100.
| Size | Height | Difference | At 100 km/h | Sidewall | Match | Compare |
|---|---|---|---|---|---|---|
| 245/40R17 | 627.8 mm | −1.4 mm (−0.22%) | 99.8 km/h | 98.0 mm | Very close | Compare |
| 215/45R17 | 625.3 mm | −3.9 mm (−0.62%) | 99.4 km/h | 96.8 mm | Close | Compare |
| 225/45R17 | 634.3 mm | +5.1 mm (+0.81%) | 100.8 km/h | 101.3 mm | Close | Compare |
| 205/50R17 | 636.8 mm | +7.6 mm (+1.21%) | 101.2 km/h | 102.5 mm | Close | Compare |
| 225/40R18 | 637.2 mm | +8.0 mm (+1.27%) | 101.3 km/h | 90.0 mm | Close | Compare |
| 235/40R17 | 619.8 mm | −9.4 mm (−1.49%) | 98.5 km/h | 94.0 mm | Close | Compare |
| 205/45R17 | 616.3 mm | −12.9 mm (−2.05%) | 97.9 km/h | 92.3 mm | Within range | Compare |
| 235/45R17 | 643.3 mm | +14.1 mm (+2.24%) | 102.2 km/h | 105.8 mm | Within range | Compare |
- Keeping your wheels, the closest is 225/40R18 at 637.2 mm, +8.0 mm (+1.27%) from the original. With the speedometer on 100 km/h, the car would actually be doing about 101.3 km/h. Ground clearance rises by about 4.0 mm.
- Moving up to 19-inch wheels, the closest height match is 235/35R19 (+2.84%), with the sidewall dropping from 86.0 mm to 82.3 mm.
- Going down to 17-inch wheels, 245/40R17 (−0.22%) is the closest match and raises the sidewall to 98.0 mm.
- A larger or wider tire also changes acceleration, fuel use and steering weight, so look beyond the percentage.
Buying 215/40R18 tires
Low-profile sizes are mostly performance tires and price rises with W or Y speed ratings; comfort-focused models exist in the same size if you do not drive hard.
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 215/40R18
The code after the size on the sidewall, as in 215/40R18 85V, is the load index and speed symbol. The common ratings for this size:
| Version | Index | Per tire | Four tires |
|---|---|---|---|
| Standard load (SL) | 85 | 515 kg | 2,060 kg |
| Extra load (XL) | 89 | 580 kg | 2,320 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
Y
300 km/h
215/40R18 questions
How tall is a 215/40R18 tire?
About 24.8 inches, or 629.2 mm, from top to bottom before it carries weight. Each sidewall is 86.0 mm tall and the tire is 215 mm (8.5 in) wide.
Which cars use 215/40R18 tires?
No car in our data is fitted with 215/40R18 from the factory, but its height is close to the original size on Honda City / City Hatchback, Mazda2, Toyota Veloz, Toyota Yaris ATIV HEV and BYD Dolphin, so it works as a replacement size.
Can I fit 225/40R18 instead of 215/40R18?
Size-wise, yes: the height differs by +1.27% (+8.0 mm), so an indicated 100 km/h is really about 101.3 km/h. The tread is 10 mm wider. Check rim width and load index first.
How much weight can a 215/40R18 tire carry?
Most standard-load versions carry load index 85: 515 kg per tire, 2,060 kg across four. XL versions are rated 89, or 580 kg per tire. Look for the number after the size on the sidewall, as in 215/40R18 85V.
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.