235/40R18 vs 265/30R19
265/30R19 is 3.0 mm shorter than 235/40R18 in overall diameter (−0.5%), within the usual 3% limit, so it can replace it where the wheels and clearance allow. With 265/30R19 fitted, the speedometer reads 100 km/h when you are doing 99.5 km/h.
Dimensions side by side
| 235/40R18 | 265/30R19 | |
|---|---|---|
| Overall diameter | 645 mm (25.4″) | 642 mm (25.3″) |
| Section width | 235 mm | 265 mm |
| Sidewall height | 94 mm | 80 mm |
| Rim | 18″ | 19″ |
| Revolutions per km | 494 | 496 |
| In stock | 45 tires from $110.00 | 3 tires from $307.00 |
What changes
- Overall diameter: 265/30R19 is 3.0 mm shorter (−0.5%).
- Speedometer: reads 100 km/h at an actual 99.5 km/h with 265/30R19.
- 265/30R19 is 30 mm wider, so check clearance and the recommended rim width.
- Wheel size changes from 18″ to 19″: 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 235/40R18
Vehicles that use 265/30R19
See every alternate size for 235/40R18
Frequently asked questions
Can I use 265/30R19 instead of 235/40R18?
Usually, yes: 265/30R19 is within 3% of the overall diameter of 235/40R18 (−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 235/40R18 and 265/30R19?
With 265/30R19 instead of 235/40R18, the speedometer shows 100 km/h when you are actually doing 99.5 km/h.
Which vehicles came with both 235/40R18 and 265/30R19?
Both sizes were original equipment, on different trims or packages, on the 2006–2007 Maserati Coupe.