225/45R19 vs 225/50R18
225/50R18 is 3.0 mm shorter than 225/45R19 in overall diameter (−0.4%), within the usual 3% limit, so it can replace it where the wheels and clearance allow. With 225/50R18 fitted, the speedometer reads 100 km/h when you are doing 99.6 km/h.
Dimensions side by side
| 225/45R19 | 225/50R18 | |
|---|---|---|
| Overall diameter | 685 mm (27.0″) | 682 mm (26.9″) |
| Section width | 225 mm | 225 mm |
| Sidewall height | 101 mm | 113 mm |
| Rim | 19″ | 18″ |
| Revolutions per km | 465 | 467 |
| In stock | 23 tires from $138.00 | 59 tires from $132.00 |
What changes
- Overall diameter: 225/50R18 is 3.0 mm shorter (−0.4%).
- Speedometer: reads 100 km/h at an actual 99.6 km/h with 225/50R18.
- Wheel size changes from 19″ 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 225/45R19
Vehicles that use 225/50R18
See every alternate size for 225/45R19
Frequently asked questions
Can I use 225/50R18 instead of 225/45R19?
Usually, yes: 225/50R18 is within 3% of the overall diameter of 225/45R19 (−0.4%). 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 225/45R19 and 225/50R18?
With 225/50R18 instead of 225/45R19, the speedometer shows 100 km/h when you are actually doing 99.6 km/h.
Which vehicles came with both 225/45R19 and 225/50R18?
Both sizes were original equipment, on different trims or packages, on the 2017–2024 Mini Countryman, 2017–2024 Mini Cooper, 2018–2023 BMW X2, 2016–2022 BMW X1, 2017–2019 BMW 330i, 2017–2019 BMW 340i.