255/35R20 vs 285/30R20
285/30R20 is 8.0 mm shorter than 255/35R20 in overall diameter (−1.2%), within the usual 3% limit, so it can replace it where the wheels and clearance allow. With 285/30R20 fitted, the speedometer reads 100 km/h when you are doing 98.8 km/h.
Dimensions side by side
| 255/35R20 | 285/30R20 | |
|---|---|---|
| Overall diameter | 687 mm (27.0″) | 679 mm (26.7″) |
| Section width | 255 mm | 285 mm |
| Sidewall height | 89 mm | 86 mm |
| Rim | 20″ | 20″ |
| Revolutions per km | 463 | 469 |
| In stock | 12 tires from $129.00 | 6 tires from $401.00 |
What changes
- Overall diameter: 285/30R20 is 8.0 mm shorter (−1.2%).
- Speedometer: reads 100 km/h at an actual 98.8 km/h with 285/30R20.
- 285/30R20 is 30 mm wider, so check clearance and the recommended rim width.
- Choose a load index at least as high as the one on your door placard.
Vehicles that came with both sizes
Vehicles that use 255/35R20
Vehicles that use 285/30R20
See every alternate size for 255/35R20
Frequently asked questions
Can I use 285/30R20 instead of 255/35R20?
Usually, yes: 285/30R20 is within 3% of the overall diameter of 255/35R20 (−1.2%). 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 255/35R20 and 285/30R20?
With 285/30R20 instead of 255/35R20, the speedometer shows 100 km/h when you are actually doing 98.8 km/h.
Which vehicles came with both 255/35R20 and 285/30R20?
Both sizes were original equipment, on different trims or packages, on the 2022–2024 BMW i4, 2003–2015 Jaguar XKR, 2007–2015 Jaguar XK, 2009–2015 Jaguar XF, 2010–2015 Jaguar XFR, 2003 BMW Z8.