235/65R18 vs 245/65R17
245/65R17 is 13.0 mm shorter than 235/65R18 in overall diameter (−1.7%), within the usual 3% limit, so it can replace it where the wheels and clearance allow. With 245/65R17 fitted, the speedometer reads 100 km/h when you are doing 98.3 km/h.
Dimensions side by side
| 235/65R18 | 245/65R17 | |
|---|---|---|
| Overall diameter | 763 mm (30.0″) | 750 mm (29.5″) |
| Section width | 235 mm | 245 mm |
| Sidewall height | 153 mm | 159 mm |
| Rim | 18″ | 17″ |
| Revolutions per km | 417 | 424 |
| In stock | 57 tires from $155.00 | 38 tires from $152.00 |
What changes
- Overall diameter: 245/65R17 is 13.0 mm shorter (−1.7%).
- Speedometer: reads 100 km/h at an actual 98.3 km/h with 245/65R17.
- 245/65R17 is 10 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 235/65R18
Vehicles that use 245/65R17
See every alternate size for 235/65R18
Frequently asked questions
Can I use 245/65R17 instead of 235/65R18?
Usually, yes: 245/65R17 is within 3% of the overall diameter of 235/65R18 (−1.7%). 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 235/65R18 and 245/65R17?
With 245/65R17 instead of 235/65R18, the speedometer shows 100 km/h when you are actually doing 98.3 km/h.
Which vehicles came with both 235/65R18 and 245/65R17?
Both sizes were original equipment, on different trims or packages, on the 2017–2019 GMC Acadia, 2006–2010 Ford Explorer, 2006–2007 Mercury Mountaineer.