235/50R19 vs 235/55R18
235/55R18 is 2.0 mm shorter than 235/50R19 in overall diameter (−0.3%), within the usual 3% limit, so it can replace it where the wheels and clearance allow. With 235/55R18 fitted, the speedometer reads 100 km/h when you are doing 99.7 km/h.
Dimensions side by side
| 235/50R19 | 235/55R18 | |
|---|---|---|
| Overall diameter | 718 mm (28.3″) | 716 mm (28.2″) |
| Section width | 235 mm | 235 mm |
| Sidewall height | 118 mm | 129 mm |
| Rim | 19″ | 18″ |
| Revolutions per km | 443 | 445 |
| In stock | 56 tires from $130.00 | 60 tires from $128.00 |
What changes
- Overall diameter: 235/55R18 is 2.0 mm shorter (−0.3%).
- Speedometer: reads 100 km/h at an actual 99.7 km/h with 235/55R18.
- 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 235/50R19
Vehicles that use 235/55R18
See every alternate size for 235/50R19
Frequently asked questions
Can I use 235/55R18 instead of 235/50R19?
Usually, yes: 235/55R18 is within 3% of the overall diameter of 235/50R19 (−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 235/50R19 and 235/55R18?
With 235/55R18 instead of 235/50R19, the speedometer shows 100 km/h when you are actually doing 99.7 km/h.
Which vehicles came with both 235/50R19 and 235/55R18?
Both sizes were original equipment, on different trims or packages, on the 2019–2024 Volvo XC40, 2019–2024 Audi Q3, 2020–2024 Mercedes-Benz GLB250, 2021–2024 Mercedes-Benz GLA250, 2022–2024 Mercedes-Benz EQB300, 2020 Mercedes-Benz GLA 250.