215/55R17 vs 235/45R18
235/45R18 is 1.0 mm taller than 215/55R17 in overall diameter (+0.1%), within the usual 3% limit, so it can replace it where the wheels and clearance allow. With 235/45R18 fitted, the speedometer reads 100 km/h when you are doing 100.1 km/h.
Dimensions side by side
| 215/55R17 | 235/45R18 | |
|---|---|---|
| Overall diameter | 668 mm (26.3″) | 669 mm (26.3″) |
| Section width | 215 mm | 235 mm |
| Sidewall height | 118 mm | 106 mm |
| Rim | 17″ | 18″ |
| Revolutions per km | 477 | 476 |
| In stock | 83 tires from $108.00 | 88 tires from $111.00 |
What changes
- Overall diameter: 235/45R18 is 1.0 mm taller (+0.1%).
- Speedometer: reads 100 km/h at an actual 100.1 km/h with 235/45R18.
- 235/45R18 is 20 mm wider, so check clearance and the recommended rim width.
- Wheel size changes from 17″ to 18″: you need wheels in the new size.
- Choose a load index at least as high as the one on your door placard.
Vehicles that came with both sizes
Vehicles that use 215/55R17
Vehicles that use 235/45R18
See every alternate size for 215/55R17
Frequently asked questions
Can I use 235/45R18 instead of 215/55R17?
Usually, yes: 235/45R18 is within 3% of the overall diameter of 215/55R17 (+0.1%). Use wheels of the right size and width, match or exceed the original load index, and check clearance at full steering lock.
How much does the speedometer change between 215/55R17 and 235/45R18?
With 235/45R18 instead of 215/55R17, the speedometer shows 100 km/h when you are actually doing 100.1 km/h.
Which vehicles came with both 215/55R17 and 235/45R18?
Both sizes were original equipment, on different trims or packages, on the 2019–2024 Lexus ES, 2016–2020, 2024 Kia Soul, 2024 Hyundai Sonata, 2014–2018 Volkswagen Beetle, 2018 Kia Optima, 2015–2017 Chrysler 200.