255/70R18 vs 285/70R17
285/70R17 is 17.0 mm taller than 255/70R18 in overall diameter (+2.1%), within the usual 3% limit, so it can replace it where the wheels and clearance allow. With 285/70R17 fitted, the speedometer reads 100 km/h when you are doing 102.1 km/h.
Dimensions side by side
| 255/70R18 | 285/70R17 | |
|---|---|---|
| Overall diameter | 814 mm (32.0″) | 831 mm (32.7″) |
| Section width | 255 mm | 285 mm |
| Sidewall height | 179 mm | 200 mm |
| Rim | 18″ | 17″ |
| Revolutions per km | 391 | 383 |
| In stock | 16 tires from $179.00 | 6 tires from $255.00 |
What changes
- Overall diameter: 285/70R17 is 17.0 mm taller (+2.1%).
- Speedometer: reads 100 km/h at an actual 102.1 km/h with 285/70R17.
- 285/70R17 is 30 mm wider, so check clearance and the recommended rim width.
- 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 255/70R18
Vehicles that use 285/70R17
See every alternate size for 255/70R18
Frequently asked questions
Can I use 285/70R17 instead of 255/70R18?
Usually, yes: 285/70R17 is within 3% of the overall diameter of 255/70R18 (+2.1%). 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 255/70R18 and 285/70R17?
With 285/70R17 instead of 255/70R18, the speedometer shows 100 km/h when you are actually doing 102.1 km/h.
Which vehicles came with both 255/70R18 and 285/70R17?
Both sizes were original equipment, on different trims or packages, on the 2011–2013 Toyota Tundra.