235/45R18 vs 235/50R17
235/50R17 is 2.0 mm shorter than 235/45R18 in overall diameter (−0.3%), within the usual 3% limit, so it can replace it where the wheels and clearance allow. With 235/50R17 fitted, the speedometer reads 100 km/h when you are doing 99.7 km/h.
Dimensions side by side
| 235/45R18 | 235/50R17 | |
|---|---|---|
| Overall diameter | 669 mm (26.3″) | 667 mm (26.3″) |
| Section width | 235 mm | 235 mm |
| Sidewall height | 106 mm | 118 mm |
| Rim | 18″ | 17″ |
| Revolutions per km | 476 | 477 |
| In stock | 88 tires from $111.00 | 15 tires from $118.00 |
What changes
- Overall diameter: 235/50R17 is 2.0 mm shorter (−0.3%).
- Speedometer: reads 100 km/h at an actual 99.7 km/h with 235/50R17.
- Wheel size changes from 18″ to 17″: 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 235/45R18
Vehicles that use 235/50R17
See every alternate size for 235/45R18
Frequently asked questions
Can I use 235/50R17 instead of 235/45R18?
Usually, yes: 235/50R17 is within 3% of the overall diameter of 235/45R18 (−0.3%). 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 235/45R18 and 235/50R17?
With 235/50R17 instead of 235/45R18, the speedometer shows 100 km/h when you are actually doing 99.7 km/h.
Which vehicles came with both 235/45R18 and 235/50R17?
Both sizes were original equipment, on different trims or packages, on the 2013–2020 Ford Fusion, 2016–2019 Lexus GS.