215/50R18 tire size
A 215/50R18 tire is 215 mm wide with a 107.5 mm sidewall, 50% of the width, on a 18-inch rim, which puts the whole tire at 672.2 mm, or about 26.5 inches, tall. Our data lists 2 models fitted with it from the factory, mostly SUVs and crossovers and hatchbacks.
Overall height
672.2 mm
26.5 in
Sidewall
107.5 mm
50%
Circumference
2,112 mm
Revs per km
474
Actual dimensions of 215/50R18
| Section width | 215 mm (8.5 in) |
| Sidewall height | 107.5 mm (4.23 in) |
| Rim diameter | 18 in (457.2 mm) |
| Overall diameter | 672.2 mm (26.5 in) |
| Circumference | 2,112 mm |
| Revolutions per km | 474 |
| Inch notation (height x width) | 26.5x8.5R18 |
Worked out: sidewall 215 x 0.5 = 107.5 mm, rim 18 x 25.4 = 457.2 mm, overall 457.2 + (107.5 x 2) = 672.2 mm, circumference 3.1416 x 672.2 = 2,112 mm. One turn of the tire moves the car about 2.11 m, which is 474 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 215/50R18 from the factory
Models whose Thai-market specification lists 215/50R18; the source column links to the spec we checked.
| Model | Years | Grades | Source |
|---|---|---|---|
| Mazda CX-3 | 2015–present | 18-inch wheel grades | mazda.co.th |
| ORA Good Cat | 2021–present | 18-inch wheel grades | headlightmag.com |
Cars that can switch to 215/50R18
These cars leave the factory on another size within 3% of the height of 215/50R18. Whether it fits still depends on rim width and wheel-well clearance.
Sizes that can replace 215/50R18
Sizes within ±3% of the overall height of 215/50R18. “At 100 km/h” is the real speed when the speedometer reads 100.
| Size | Height | Difference | At 100 km/h | Sidewall | Match | Compare |
|---|---|---|---|---|---|---|
| 235/35R20 | 672.5 mm | +0.3 mm (+0.04%) | 100.0 km/h | 82.3 mm | Very close | Compare |
| 235/40R19 | 670.6 mm | −1.6 mm (−0.24%) | 99.8 km/h | 94.0 mm | Very close | Compare |
| 235/45R18 | 668.7 mm | −3.5 mm (−0.52%) | 99.5 km/h | 105.8 mm | Close | Compare |
| 215/55R17 | 668.3 mm | −3.9 mm (−0.58%) | 99.4 km/h | 118.3 mm | Close | Compare |
| 245/45R18 | 677.7 mm | +5.5 mm (+0.82%) | 100.8 km/h | 110.3 mm | Close | Compare |
| 245/40R19 | 678.6 mm | +6.4 mm (+0.95%) | 101.0 km/h | 98.0 mm | Close | Compare |
| 225/55R17 | 679.3 mm | +7.1 mm (+1.06%) | 101.1 km/h | 123.8 mm | Close | Compare |
| 245/35R20 | 679.5 mm | +7.3 mm (+1.09%) | 101.1 km/h | 85.8 mm | Close | Compare |
- Keeping your wheels, the closest is 235/45R18 at 668.7 mm, −3.5 mm (−0.52%) from the original. With the speedometer on 100 km/h, the car would actually be doing about 99.5 km/h. Ground clearance drops by about 1.8 mm.
- Moving up to 19-inch wheels, the closest height match is 235/40R19 (−0.24%), with the sidewall dropping from 107.5 mm to 94.0 mm.
- Going down to 17-inch wheels, 215/55R17 (−0.58%) is the closest match and raises the sidewall to 118.3 mm.
- A larger or wider tire also changes acceleration, fuel use and steering weight, so look beyond the percentage.
Buying 215/50R18 tires
EVs are heavy and deliver torque instantly, so EV tires are often XL-rated and some carry noise-cutting foam, which puts them above standard tires in price.
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 215/50R18
The code after the size on the sidewall, as in 215/50R18 92V, is the load index and speed symbol. The common ratings for this size:
| Version | Index | Per tire | Four tires |
|---|---|---|---|
| Standard load (SL) | 92 | 630 kg | 2,520 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
215/50R18 questions
How tall is a 215/50R18 tire?
About 26.5 inches, or 672.2 mm, from top to bottom before it carries weight. Each sidewall is 107.5 mm tall and the tire is 215 mm (8.5 in) wide.
Which cars use 215/50R18 tires?
From Thai-market specifications, 215/50R18 comes on Mazda CX-3 and ORA Good Cat.
Can I fit 235/45R18 instead of 215/50R18?
Size-wise, yes: the height differs by −0.52% (−3.5 mm), so an indicated 100 km/h is really about 99.5 km/h. The tread is 20 mm wider. Check rim width and load index first.
How much weight can a 215/50R18 tire carry?
Most standard-load versions carry load index 92: 630 kg per tire, 2,520 kg across four. Look for the number after the size on the sidewall, as in 215/50R18 92V.
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.