225/35R19 vs 225/40R18
225/40R18 is 3.0 mm shorter than 225/35R19 in overall diameter (−0.5%), within the usual 3% limit, so it can replace it where the wheels and clearance allow. With 225/40R18 fitted, the speedometer reads 100 km/h when you are doing 99.5 km/h.
Dimensions side by side
| 225/35R19 | 225/40R18 | |
|---|---|---|
| Overall diameter | 640 mm (25.2″) | 637 mm (25.1″) |
| Section width | 225 mm | 225 mm |
| Sidewall height | 79 mm | 90 mm |
| Rim | 19″ | 18″ |
| Revolutions per km | 497 | 500 |
| In stock | 6 tires from $109.00 | 77 tires from $110.00 |
What changes
- Overall diameter: 225/40R18 is 3.0 mm shorter (−0.5%).
- Speedometer: reads 100 km/h at an actual 99.5 km/h with 225/40R18.
- Wheel size changes from 19″ 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 225/35R19
Vehicles that use 225/40R18
See every alternate size for 225/35R19
Frequently asked questions
Can I use 225/40R18 instead of 225/35R19?
Usually, yes: 225/40R18 is within 3% of the overall diameter of 225/35R19 (−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 225/35R19 and 225/40R18?
With 225/40R18 instead of 225/35R19, the speedometer shows 100 km/h when you are actually doing 99.5 km/h.
Which vehicles came with both 225/35R19 and 225/40R18?
Both sizes were original equipment, on different trims or packages, on the 2016–2019 Mini Clubman, 2016–2019 Mini Cooper, 2019 Cadillac ATS, 2010–2016 BMW Z4, 2007–2013 BMW 335i, 2011–2013 BMW 335is.