235/45R18 tire size
A 235/45R18 tire is 235 mm wide with a 105.8 mm sidewall, 45% of the width, on a 18-inch rim, which puts the whole tire at 668.7 mm, or about 26.3 inches, tall. Our data lists 4 models fitted with it from the factory, mostly sedans and hatchbacks.
Overall height
668.7 mm
26.3 in
Sidewall
105.8 mm
45%
Circumference
2,101 mm
Revs per km
476
Actual dimensions of 235/45R18
| Section width | 235 mm (9.3 in) |
| Sidewall height | 105.8 mm (4.16 in) |
| Rim diameter | 18 in (457.2 mm) |
| Overall diameter | 668.7 mm (26.3 in) |
| Circumference | 2,101 mm |
| Revolutions per km | 476 |
| Inch notation (height x width) | 26.3x9.3R18 |
Worked out: sidewall 235 x 0.45 = 105.75 mm, rim 18 x 25.4 = 457.2 mm, overall 457.2 + (105.75 x 2) = 668.7 mm, circumference 3.1416 x 668.7 = 2,101 mm. One turn of the tire moves the car about 2.10 m, which is 476 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 235/45R18 from the factory
Models whose Thai-market specification lists 235/45R18; the source column links to the spec we checked.
| Model | Years | Grades | Source |
|---|---|---|---|
| Toyota Camry HEV | 2024–present | Premium, Premium Luxury | headlightmag.com |
| Honda Accord e:HEV | 2024–present | EL, RS | honda.co.th |
| MG4 Electric | 2022–present | 18-inch wheel grades | mgcars.com |
| Tesla Model 3 | 2024–present | 18-inch wheel grades | headlightmag.com |
Cars that can switch to 235/45R18
These cars leave the factory on another size within 3% of the height of 235/45R18. Whether it fits still depends on rim width and wheel-well clearance.
| Model | Factory size | Height difference | Wheel |
|---|---|---|---|
| Mazda CX-32015–present | 215/50R18 | −0.52% | Same wheel |
| ORA Good Cat2021–present | 215/50R18 | −0.52% | Same wheel |
| Toyota C-HR2018–2023 | 225/50R18 | −1.98% | Same wheel |
| Toyota Corolla Cross2020–present | 225/50R18 | −1.98% | Same wheel |
| Toyota Innova Zenix HEV2023–present | 225/50R18 | −1.98% | Same wheel |
| Honda e:N12024–present | 225/50R18 | −1.98% | Same wheel |
| Honda HR-V e:HEV2022–present | 225/50R18 | −1.98% | Same wheel |
| Mitsubishi Xforce HEVCurrent model | 225/50R18 | −1.98% | Same wheel |
| BYD Seal2023–present | 225/50R18 | −1.98% | Same wheel |
| Mazda32019–present | 215/45R18 | +2.77% | Same wheel |
| Honda BR-V2022–present | 215/55R17 | +0.06% | Needs 18-inch wheels |
| Honda HR-V2015–2021 | 215/55R17 | +0.06% | Needs 18-inch wheels |
Showing the 12 closest of 19 models.
Sizes that can replace 235/45R18
Sizes within ±3% of the overall height of 235/45R18. “At 100 km/h” is the real speed when the speedometer reads 100.
| Size | Height | Difference | At 100 km/h | Sidewall | Match | Compare |
|---|---|---|---|---|---|---|
| 215/55R17 | 668.3 mm | −0.4 mm (−0.06%) | 99.9 km/h | 118.3 mm | Very close | Compare |
| 235/40R19 | 670.6 mm | +1.9 mm (+0.28%) | 100.3 km/h | 94.0 mm | Very close | Compare |
| 215/50R18 | 672.2 mm | +3.5 mm (+0.52%) | 100.5 km/h | 107.5 mm | Close | Compare |
| 235/35R20 | 672.5 mm | +3.8 mm (+0.57%) | 100.6 km/h | 82.3 mm | Close | Compare |
| 225/40R19 | 662.6 mm | −6.1 mm (−0.91%) | 99.1 km/h | 90.0 mm | Close | Compare |
| 255/35R19 | 661.1 mm | −7.6 mm (−1.14%) | 98.9 km/h | 89.3 mm | Close | Compare |
| 225/45R18 | 659.7 mm | −9.0 mm (−1.35%) | 98.7 km/h | 101.3 mm | Close | Compare |
| 245/45R18 | 677.7 mm | +9.0 mm (+1.35%) | 101.3 km/h | 110.3 mm | Close | Compare |
- Keeping your wheels, the closest is 215/50R18 at 672.2 mm, +3.5 mm (+0.52%) from the original. With the speedometer on 100 km/h, the car would actually be doing about 100.5 km/h. Ground clearance rises by about 1.8 mm.
- Moving up to 19-inch wheels, the closest height match is 235/40R19 (+0.28%), with the sidewall dropping from 105.8 mm to 94.0 mm.
- Going down to 17-inch wheels, 215/55R17 (−0.06%) 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 235/45R18 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 235/45R18
The code after the size on the sidewall, as in 235/45R18 94V, is the load index and speed symbol. The common ratings for this size:
| Version | Index | Per tire | Four tires |
|---|---|---|---|
| Standard load (SL) | 94 | 670 kg | 2,680 kg |
| Extra load (XL) | 98 | 750 kg | 3,000 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
235/45R18 questions
How tall is a 235/45R18 tire?
About 26.3 inches, or 668.7 mm, from top to bottom before it carries weight. Each sidewall is 105.8 mm tall and the tire is 235 mm (9.3 in) wide.
Which cars use 235/45R18 tires?
From Thai-market specifications, 235/45R18 comes on Toyota Camry HEV, Honda Accord e:HEV, MG4 Electric and Tesla Model 3.
Can I fit 215/50R18 instead of 235/45R18?
Size-wise, yes: the height differs by +0.52% (+3.5 mm), so an indicated 100 km/h is really about 100.5 km/h. The tread is 20 mm narrower. Check rim width and load index first.
How much weight can a 235/45R18 tire carry?
Most standard-load versions carry load index 94: 670 kg per tire, 2,680 kg across four. XL versions are rated 98, or 750 kg per tire. Look for the number after the size on the sidewall, as in 235/45R18 94V.
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.