245/75R17 vs 275/65R18
275/65R18 is 16.0 mm taller than 245/75R17 in overall diameter (+2.0%), within the usual 3% limit, so it can replace it where the wheels and clearance allow. With 275/65R18 fitted, the speedometer reads 100 km/h when you are doing 102.0 km/h.
Dimensions side by side
| 245/75R17 | 275/65R18 | |
|---|---|---|
| Overall diameter | 799 mm (31.5″) | 815 mm (32.1″) |
| Section width | 245 mm | 275 mm |
| Sidewall height | 184 mm | 179 mm |
| Rim | 17″ | 18″ |
| Revolutions per km | 398 | 391 |
| In stock | 7 tires from $216.00 | 38 tires from $181.00 |
What changes
- Overall diameter: 275/65R18 is 16.0 mm taller (+2.0%).
- Speedometer: reads 100 km/h at an actual 102.0 km/h with 275/65R18.
- 275/65R18 is 30 mm wider, so check clearance and the recommended rim width.
- Wheel size changes from 17″ 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 245/75R17
Vehicles that use 275/65R18
See every alternate size for 245/75R17
Frequently asked questions
Can I use 275/65R18 instead of 245/75R17?
Usually, yes: 275/65R18 is within 3% of the overall diameter of 245/75R17 (+2.0%). 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 245/75R17 and 275/65R18?
With 275/65R18 instead of 245/75R17, the speedometer shows 100 km/h when you are actually doing 102.0 km/h.
Which vehicles came with both 245/75R17 and 275/65R18?
Both sizes were original equipment, on different trims or packages, on the 2011–2024 Ford F350, 2006–2007, 2009–2022 Ford F250, 2009 Ford F150.