255/35R19 vs 285/35R18
285/35R18 is 4.0 mm shorter than 255/35R19 in overall diameter (−0.6%), within the usual 3% limit, so it can replace it where the wheels and clearance allow. With 285/35R18 fitted, the speedometer reads 100 km/h when you are doing 99.4 km/h.
Dimensions side by side
| 255/35R19 | 285/35R18 | |
|---|---|---|
| Overall diameter | 661 mm (26.0″) | 657 mm (25.9″) |
| Section width | 255 mm | 285 mm |
| Sidewall height | 89 mm | 100 mm |
| Rim | 19″ | 18″ |
| Revolutions per km | 482 | 484 |
| In stock | 55 tires from $151.00 | 6 tires from $278.00 |
What changes
- Overall diameter: 285/35R18 is 4.0 mm shorter (−0.6%).
- Speedometer: reads 100 km/h at an actual 99.4 km/h with 285/35R18.
- 285/35R18 is 30 mm wider, so check clearance and the recommended rim width.
- 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 255/35R19
Vehicles that use 285/35R18
See every alternate size for 255/35R19
Frequently asked questions
Can I use 285/35R18 instead of 255/35R19?
Usually, yes: 285/35R18 is within 3% of the overall diameter of 255/35R19 (−0.6%). 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 255/35R19 and 285/35R18?
With 285/35R18 instead of 255/35R19, the speedometer shows 100 km/h when you are actually doing 99.4 km/h.
Which vehicles came with both 255/35R19 and 285/35R18?
Both sizes were original equipment, on different trims or packages, on the 2017–2021 Mercedes-Benz C63, 2010–2018 Mercedes-Benz CLS550, 2010–2018 Mercedes-Benz SL550, 2016–2017 Mercedes-Benz CLS400, 2017 Mercedes-Benz SL450, 2016 Mercedes-Benz SL400.