245/60R18 vs 255/50R20
255/50R20 is 12.0 mm taller than 245/60R18 in overall diameter (+1.6%), within the usual 3% limit, so it can replace it where the wheels and clearance allow. With 255/50R20 fitted, the speedometer reads 100 km/h when you are doing 101.6 km/h.
Dimensions side by side
| 245/60R18 | 255/50R20 | |
|---|---|---|
| Overall diameter | 751 mm (29.6″) | 763 mm (30.0″) |
| Section width | 245 mm | 255 mm |
| Sidewall height | 147 mm | 128 mm |
| Rim | 18″ | 20″ |
| Revolutions per km | 424 | 417 |
| In stock | 66 tires from $150.00 | 50 tires from $169.00 |
What changes
- Overall diameter: 255/50R20 is 12.0 mm taller (+1.6%).
- Speedometer: reads 100 km/h at an actual 101.6 km/h with 255/50R20.
- 255/50R20 is 10 mm wider, so check clearance and the recommended rim width.
- Wheel size changes from 18″ to 20″: 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 245/60R18
Vehicles that use 255/50R20
See every alternate size for 245/60R18
Frequently asked questions
Can I use 255/50R20 instead of 245/60R18?
Usually, yes: 255/50R20 is within 3% of the overall diameter of 245/60R18 (+1.6%). 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 245/60R18 and 255/50R20?
With 255/50R20 instead of 245/60R18, the speedometer shows 100 km/h when you are actually doing 101.6 km/h.
Which vehicles came with both 245/60R18 and 255/50R20?
Both sizes were original equipment, on different trims or packages, on the 2020–2024 Volkswagen Atlas Cross Sport, 2018–2023 Volkswagen Atlas, 2011–2019 Ford Explorer.