245/40R18 vs 275/35R18
275/35R18 is 3.0 mm shorter than 245/40R18 in overall diameter (−0.5%), within the usual 3% limit, so it can replace it where the wheels and clearance allow. With 275/35R18 fitted, the speedometer reads 100 km/h when you are doing 99.5 km/h.
Dimensions side by side
| 245/40R18 | 275/35R18 | |
|---|---|---|
| Overall diameter | 653 mm (25.7″) | 650 mm (25.6″) |
| Section width | 245 mm | 275 mm |
| Sidewall height | 98 mm | 96 mm |
| Rim | 18″ | 18″ |
| Revolutions per km | 487 | 490 |
| In stock | 62 tires from $119.00 | 8 tires from $280.00 |
What changes
- Overall diameter: 275/35R18 is 3.0 mm shorter (−0.5%).
- Speedometer: reads 100 km/h at an actual 99.5 km/h with 275/35R18.
- 275/35R18 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 245/40R18
Vehicles that use 275/35R18
See every alternate size for 245/40R18
Frequently asked questions
Can I use 275/35R18 instead of 245/40R18?
Usually, yes: 275/35R18 is within 3% of the overall diameter of 245/40R18 (−0.5%). 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 245/40R18 and 275/35R18?
With 275/35R18 instead of 245/40R18, the speedometer shows 100 km/h when you are actually doing 99.5 km/h.
Which vehicles came with both 245/40R18 and 275/35R18?
Both sizes were original equipment, on different trims or packages, on the 2014–2019 Cadillac CTS, 2008–2010 BMW 535i, 2007–2010 Mercedes-Benz CLS550, 2002–2008 Jaguar S-Type, 2008 BMW 535xi, 2006–2007 BMW 550i.